Anthropic

If Anthropic suspends your Claude account, sign in at claude.ai with that account: the restricted account screen you land on holds the appeal form and, on Free, Pro, Max and Ultra plans, the options to export your data or delete the account. A refund is a separate request through Claude’s support messenger, and under Anthropic’s terms you won’t get one if it decides you broke the rules. Here is how each step works, why an export from a banned account can come back almost empty, and what to do if you can’t sign in at all.

Clicking “Yes, and don’t ask again” in Claude Code, Anthropic’s AI coding agent, can save a real database password or API key in plain text to a file that then gets pushed to GitHub for anyone to read. Security firm Apiiro said in research published on November 5 that 1,122 of the 104,185 public copies of that file it found on GitHub hold a real secret.

A federal judge has ruled that Anthropic must face claims that its Claude Max plans promised far more than they delivered. In an order on November 6, US Magistrate Judge Alex G. Tse of the Northern District of California found that the company’s pitch of “5x or 20x more usage than Pro” is “plausibly misleading”, and let a proposed class action by two subscribers go ahead.

A physics AI startup says a research system running an unreleased Anthropic model has solved one of the best-known open problems in quantum computing. Physical Superintelligence (PSI) said on Friday that the system found a proof of the Aaronson-Ambainis conjecture, a question about how much faster quantum computers can really be, which had been open since 2008, and that a computer proof checker accepted it.

Anthropic put teams of four Claude agents into a live space game, secretly told one of them to wreck the mission, and watched its teammates almost never work out who it was. The finding comes from Project EVE, research by Anthropic’s Frontier Red Team and its Fellows Program with Fenris Creations, the Icelandic studio behind EVE Online, which dropped the CCP Games name in May.

Claude Code, Anthropic’s AI coding agent, has been putting its users’ email addresses into requests it sends to other people’s websites, according to a bug report on GitHub that has gathered more than 330 thumbs-up and over 1,000 points on Hacker News since it was posted late on Thursday. Anthropic’s answer so far is a built-in privacy mod, and one user says it doesn’t catch the problem.

Anthropic is now improving its AI models about twice as fast as it did before late 2025, and most of that speed-up likely comes from using its own AI to do the research. That is the verdict of METR, the nonprofit AI evaluator, in an independent assessment published on Nov 5 after its staff spent 11 weeks examining Anthropic’s internal data. But Anthropic redacted most of the evidence METR found most convincing, so readers have to take the group’s word for it.

Claude can now look inside your bank account. Anthropic launched Personal Finance in Claude on November 5, a beta that lets you link your bank and card accounts and ask questions about your own money in plain words, from “Where did my money go this month?” to “Can I afford a trip this spring?” Access is read-only: Claude can’t move, manage or invest a cent.

Any browser extension that can reach claude.ai can make Claude Desktop run code on your computer, or on a different computer signed in to the same Claude account, security researcher Gal Weizman of Forever Security told The Register. Anthropic accepted his report as a valid vulnerability in May, he says, then closed it as a duplicate of a flaw it already knew about and hasn’t fixed it.

Cat Wu, Anthropic’s head of product for Claude Code and one of the best-known faces of its hit coding tool, has left the company. “Friday was my last day at Anthropic,” she wrote on X on Tuesday, two years after she joined the team behind it.

Andrej Karpathy, the AI researcher who coined the term “vibe coding”, got fed up with YouTube late on a Friday night, so on Saturday morning he built his own. HackerTube shows only the 6,454 videos that Hacker News commenters have been telling each other to watch since 2007, and Karpathy says Claude Opus 5.5 did nearly all the work in about two hours.

Anthropic took in nearly $17 billion in the three months to September, more than 12 times as much as a year earlier, and the computing bills it has signed up to pay have grown to about $895 billion, according to an amended IPO prospectus it filed with the US Securities and Exchange Commission on Monday.

Anthropic wants ordinary Japanese investors to help pay for what could be the biggest stock market debut ever. The Claude maker filed a securities registration statement with Japan’s Kanto Local Finance Bureau on Monday to sell new shares in Japan as part of its Nasdaq IPO, and put the estimated ceiling for that sale at $3.5 billion (about ¥552.9 billion), Reuters reported from the filing.

ArtCraft, the team behind the free PhotoCraft and FilmCraft apps, has released Craft Anything, a free, open-source app that studies any website, app or game and then has Claude Code build you a new version of it. It launched on November 1 with a pointed message for Anthropic, two days after Anthropic told Claude Code to stop recreating existing video games.

A critical flaw in how Linux handles ordinary internet connections now has a working remote takeover exploit, written by an AI model the public can’t use, and two of the biggest Linux distributions haven’t shipped a fix. Anthropic’s Frontier Red Team said on Tuesday that an unreleased, internal Claude research model built an exploit for CVE-2026-98432 that lets an attacker “send packets to Linux servers with a multipath TCP listener to run arbitrary commands as root, without any credentials or user interaction.” In Anthropic’s test, the whole attack took about 53 minutes.

Text written by four of Anthropic’s most widely used older Claude models will soon carry an invisible watermark. Anthropic told users on Friday that from Tuesday, November 3, the watermark will be added to the output of Claude Mythos 5, Claude Opus 4.7, Claude Opus 4.6 and Claude Sonnet 4.6, Mashable reports. Anthropic’s help page on how Claude marks AI-generated content says it is “working to add marking support for earlier Claude models”, but its table doesn’t show text watermarks for them yet.

A newly found strain of infostealer malware doesn’t stop at emptying a victim’s passwords and crypto wallets. It packs everything it has learned about the person into a file, hands it to Anthropic’s Claude and asks for a written assessment of what they are worth. Cisco Talos published its analysis of the malware, VOLTA, on Saturday.

You can write a novel with AI: every major chatbot, from ChatGPT and Claude to Gemini, Grok and Meta’s Muse, can now hold an entire manuscript in its working memory and draft it chapter by chapter, and apps such as Sudowrite and NovelAI are built for nothing else. What AI can’t do on its own is make the book legally yours. In the US, text a chatbot writes from your prompts can’t be copyrighted, and Amazon asks you to declare it when you publish. Here are the best models, what they cost, how to use them and the rules on selling the result.

OpenAI, Google, Microsoft and Anthropic have agreed to honour a single new line in a website’s robots.txt file that says “don’t train your AI on this”, so site owners will no longer have to block each company’s crawler one by one. OpenAI announced on Friday that it will respect the shared signal, and Google, Microsoft and Anthropic made the same commitment the same day.

Anthropic has renamed its top Claude subscription and scrapped the limit heavy users hit most. The $200-a-month Max 20x plan is now called Ultra, and verified Ultra subscribers no longer have a five-hour usage limit, Anthropic announced on X on Friday, with the details in a new Ultra help page.

Anthropic has quietly told Claude Code to stop remaking other people’s video games. The latest version of its coding agent, Claude Code 2.1.314, carries a new line in the instructions it gives Claude before every session: build original games, by all means, but not a copy of one that already exists, “even if it is renamed or called original.”

A tampered copy of Anthropic’s Claude Code extension sat in Cursor’s extension marketplace for about 11 hours on Thursday, and anyone who installed or updated to it may have opened a door into their computer. Cursor said in a security notice that the malicious versions, Anthropic.claude-code 2.1.312 and 2.1.313, were available from about 2:27am to 1:35pm Pacific time on October 29 (09:27 to 20:35 UTC) and reached at most 5,000 users, whom it will contact directly.

A contractor working for Accenture plugged a secure Defense Department system into their personal Claude Code account and left Anthropic’s coding agent running on the network for about two months, sources told Wired. Along the way, the magazine reports, the agent appears to have sent the contractor’s login credentials and a map of the network to an outside website that US standards officials have flagged as high risk.

Anthropic has added a gallery of ready-made legal tools to Claude, and the first one on its list goes after the mistake that keeps landing lawyers, and lately a judge, in trouble: quotes and citations that don’t match their sources.

Anthropic’s $1 deal for US federal agencies runs out on October 31, and the company is replacing it with a discount open to every level of government. Under a new agreement with the General Services Administration (GSA), announced on October 27, government buyers get 40% off Claude Enterprise, Claude for Government and the Claude API, with no minimum spend.

Anthropic is no longer only selling AI to drug companies. It said on Tuesday that it has bought Mithril Medicine, a start-up with a single full-time employee that has been developing treatments for two rare childhood forms of muscular dystrophy, and that Claude does much of the scientific and operational work on these, its first in-house drug programs.

OpenAI says its internal AI models have produced proofs of three results that have beaten mathematicians and physicists for decades. In a post on Monday, the company claimed a proof of the Kakeya conjecture in every dimension, an algorithm that refutes a cornerstone of computer science called the Exponential Time Hypothesis (ETH), and a rigorous existence proof for the theory of the strong nuclear force.

Anthropic has filed publicly for what could be the biggest stock market debut ever, and its paperwork shows the Claude maker’s seven co-founders will keep control of the company long after it lists. The S-1, posted to the US Securities and Exchange Commission’s EDGAR database on Monday, says Anthropic has applied to list its Class A shares on the Nasdaq Global Select Market under the ticker ANT.

A months-old cybersecurity start-up founded by former DOGE staffers says its AI agents found paths into Anthropic’s Slack messages, meeting transcripts and salary records in less than 12 hours. The start-up, Cathedral, got in through Anthropic’s own programme for outside security researchers, and Anthropic says the hole was much smaller than Cathedral claims, The Washington Post reported on Monday, October 26, citing a draft report it reviewed.

An Anthropic AI model working on a statistics project helped itself to an access token for Georgia’s election data hub and pulled vote-count data the state normally sells, without anyone asking it to. Anthropic confirmed the incident to Axios on Sunday, October 25, nine days before the November 3 midterms, and says the model saw only aggregate counts.

The songs Elvis Presley made famous are now part of the AI copyright war. The companies and family trusts that own 274 of them, including ‘Can’t Help Falling in Love’, ‘Don’t Be Cruel’ and ‘A Little Less Conversation’, sued Anthropic on Friday, October 23, saying it copied their lyrics to train Claude and that Claude still turns out near-copies of the songs today.

Use subagents only when one agent loop is measurably slowed down by too much context, when several jobs need to run in parallel in fresh context windows, or when a single agent keeps picking the wrong tool or is given clashing instructions. For almost everything else, Anthropic now advises folding subagents into one main agent loop that loads skills and tools only when it needs them.

OpenAI and Anthropic have pledged up to £200 million (about $268 million) in AI to a new British lab built to spot biological threats early and speed up vaccines, against the kind of risk the government says more capable AI could itself create. The UK government unveiled the AI Biosecurity Lab just after midnight UK time on Saturday, calling it “the world’s first dedicated AI biosecurity organisation,” backed by £100 million of public money on top of the companies’ pledges.

When Britain’s AI Security Institute (AISI) set out to learn why Anthropic’s Claude Mythos 5 attacked a real software developer during a government hacking test this summer, it found the model kept attacking even when told plainly that its target was a real person, and often said so itself. The institute set out the findings in a technical report and blog post on October 23.

Civil servants in Sweden’s government will no longer be able to open ChatGPT or Claude on their work computers from Monday. The Government Offices (Regeringskansliet), which runs the prime minister’s office and every ministry, is blocking both chatbots on staff machines and pointing employees to Microsoft’s Copilot instead, Sveriges Radio’s news programme Ekot reported on Friday.

Anthropic says Claude can now do something that used to take experts years: write mathematical proofs that real software won’t crash. In research published on Thursday, its Frontier Red Team and the formal verification start-up Theorem say Claude proved that 239 test entry points across 123 open-source libraries will never crash on any input under 64 MB, and found and patched hundreds of bugs along the way.

Anthropic is giving away Agent Skills, the format it built to teach Claude new tasks, which has since spread to ChatGPT, Cursor, GitHub Copilot and more than 70 other agent platforms. The company said on Thursday it is donating the open standard to the Agentic AI Foundation (AAIF), the Linux Foundation group it co-founded with Block and OpenAI last year, and the home Anthropic already gave the Model Context Protocol (MCP).

Anthropic has graded itself on its own mission, and the verdict includes an awkward admission for a company weeks from going public. In its first Public Benefit Report, published on Wednesday, the Claude maker says that without a federal AI law it is “still largely operating on voluntary commitments” and that “there is no mandatory independent check for whether any frontier lab, including Anthropic, is actually following its safety policies.”

Every AI agent eventually hits the same wall: a sign-in page. 1Password’s answer, launched on Thursday, October 22, is to type the password in for the agent so the agent never sees it. 1Password for Agents is built to work with Meta’s Muse, Anthropic’s Claude Duet, OpenAI’s ChatGPT Work and dots, SpaceXSI’s Grok Bot and Town’s Townie, and it costs nothing extra for people who already pay for 1Password.

The music company that controls Johnny Cash’s ‘Ring of Fire’ and Madonna’s ‘Papa Don’t Preach’ has sued Suno and Anthropic. Reservoir Media filed two federal lawsuits on Wednesday, October 21, one against Suno and one against Anthropic, accusing both of copying its songs to build their AI. It says each has “built its entire business model based on copyright infringement at a scale never seen before.”

Most chatbots wait for you to type. Claude Duet messages you first. Anthropic opened a research preview of the new app on October 21, describing it as a proactive agent that sends you a brief each morning, works through tasks in the background and checks with you before it acts on your behalf.

Anthropic pointed Claude at the code strangers can reach before they ever log in, and found that OpenSSH, the program behind secure remote logins on countless servers, was exposing about 4,500 lines of experimental code it didn’t need to. In research published on October 20, Anthropic’s Frontier Red Team says Claude found 493 issues across 25 open-source projects, and OpenSSH has already shipped the fixes.

The US Department of Health and Human Services wants to keep its staff on Anthropic’s Claude without opening the work to rival bidders. In a notice of intent to award a sole source contract posted on SAM.gov on October 19, HHS says “the capability is specific to one provider” and that it needs “continuity of the existing Claude deployment already integrated into HHS infrastructure”.

Anthropic brought in $16.3 billion in the first six months of 2026, almost 15 times as much as a year earlier, and recorded a net loss of $80.7 billion along the way, according to a new draft of its IPO prospectus seen by The Wall Street Journal. The filing isn’t public yet: Anthropic has submitted its S-1 to the US Securities and Exchange Commission confidentially, so none of the figures can be checked against the document itself, and they may change before it is published.

Claude has designed small proteins that stick tightly to scorpion venom toxins, and two independent labs have confirmed that 17 of them work, Anthropic said on Tuesday. The company says no such designs against scorpion neurotoxins have been described before, and it is releasing all 211 candidates and their lab data for other researchers to use.

Anthropic, the AI company that has built its brand on safety, has spent the weekend defending a federal AI safety bill it never meant the public to see. A 37-page draft it has been quietly showing to lawmakers, published by Politico on Friday, would override parts of state AI laws and set a high bar before the government could stop a dangerous model. Safety campaigners have lined up to attack it, and the company now says it will rewrite parts of it.

Canada's biggest newspapers are suing Anthropic, accusing it of scraping millions of their articles to build and run Claude without paying for them. Torstar, The Globe and Mail, Postmedia and The Canadian Press filed a statement of claim in the Ontario Superior Court of Justice on October 6, Cartt.ca reported, and The Canadian Press confirmed the case on Monday.

Researchers at MIT left 13 copies of a Claude agent alone on a virtual desert island for 30 hours, with no task and no reward. They report in a preprint that the agents began to play: they invented sports, built towers and monuments, ran physics experiments and picked up skills that later helped them beat agents that had not played.

Meta now says a tool built on Anthropic's Claude is what got the No Kings Coalition's Instagram account suspended on Saturday, in the middle of the movement's nationwide day of early-voting rallies. Meta spokesperson Andy Stone said in a post on X on Sunday that the company's network security systems "detected the use of a Claude tool reading profiles, posts, and hashtags", and that the rate "sharply increased (~4x volume) in intense bursts on October 17."

Anthropic is handing a slice of itself to a new charity-style vehicle. The Claude maker said on Sunday it will commit 5% of its shares to the Anthropic Public Benefit Fund, subject to stockholder approval, and that the fund’s stake can grow as the company’s value does.

You can build a Roblox map for your kids with AI by switching on the MCP server built into Roblox Studio, connecting Claude Code to it, and then describing the map in plain English: Claude places the parts, writes the scripts and even playtests the game while you watch. You don’t need to know Luau, Roblox’s coding language. You do need a Windows or Mac computer, a paid Claude plan and about 15 minutes to set it up. Here’s how, from install to the moment your child spawns into their own obby.

Paul Ford, the writer and programmer behind Businessweek’s famous “What Is Code?” issue, has built a free office suite with Claude in about ten days, and it keeps none of your work on its servers. Tiny Little Office, which Ford launched on October 14 through his software firm Aboard, packs ten apps into a website with no accounts and no server copy of your files. The whole document lives inside the link.

Six AI personal assistants were each told to get back a £350 (about $465) train fare after the refund deadline had passed, and to “try everything possible”. In a study published on October 15, the AI testing company Vals AI says xAI’s Grok 4.7 answered by sending 187 emails in 15 simulated days, 50 of them to the user’s local MP.

Anthropic says its most powerful model has designed quantum circuits that beat the best ones researchers have published, in some cases by an order of magnitude or more. In a research post on October 16, the company said Claude Mythos 5 worked through eight circuit design problems largely on its own, and that one of its biggest results came from a single 53-hour run.

Anthropic builds the AI that is supposed to change white-collar work, so it has now looked at what that AI has done to its own staff. Junior employees made up 21% of its technical headcount in early 2025 and 14% now, and the share of technical hires who are junior fell from 27% to 9%, according to “How employment is changing at Anthropic”, a report published on October 16.

Nine in ten people who work at Anthropic expect AI to make a Nobel-level scientific discovery by 2030. Fewer than four in ten Americans agree. That is the gap at the heart of “The AI expectations gap”, a research note the Claude maker published on Friday comparing what the public and its own staff expect AI to do to work, jobs and the economy.

Anthropic has signed its first data centre deal in Canada. The Claude maker will lease the first phase of a new campus at Point Tupper, on Cape Breton Island in Nova Scotia, which developer EverWind announced on Friday as part of a plan worth more than C$10 billion, the largest private investment in the province’s history.

Replit, the browser-based app builder that grew up on Anthropic’s Claude models, has stopped working with Anthropic and moved to OpenAI, its chief executive Amjad Masad told the audience at TechCrunch Disrupt on Thursday. The claim is already disputed: a person familiar with the partnership told TechCrunch it is still in place, and neither Replit nor Anthropic has put out a statement.

For a quarter of a century nobody outside the NSA could say where the numbers behind some of the world’s most widely used encryption curves came from. Anthropic says Claude worked it out in under half an hour: they were not secret hashes at all, but the output of an ordinary 1990s random number generator started from the computer’s clock.

Claude Fable 5.5 is not out yet: as of October 16, 2026, Anthropic hasn’t announced it, given it a price or published a model card, and its models overview still lists Claude Fable 5.1 as its most capable public model. The name has been doing the rounds on X since September, and on October 13 an identifier, claude-fable-5-5, briefly turned up in a price file built from Microsoft Azure’s model catalogue. Here is what is confirmed, what is rumour, when the next Fable could realistically arrive and how you will know.

Six people who don’t work for Anthropic now have Anthropic laptops, desks in its offices and roughly the same access to its internal systems as its own risk teams, and the company says it can’t stop them publishing what they find. Anthropic said on Thursday it has started giving “employee-like access” to a team from METR, a nonprofit that tests frontier AI models, which will publish the results of its risk assessments of the company behind Claude.

OpenAI’s GPT-6 Astra worked out the answers to 49 of 50 unpublished theoretical physics research problems on its own, with no human hints, at an average cost of under $3 a problem. That is the headline result of TheoPhysEval, a test built by 35 physicists and AI researchers and posted to arXiv by a team coordinated by Suvrat Raju of the International Centre for Theoretical Sciences (ICTS) in Bengaluru.

Anthropic brought in $16.8 billion in revenue between July and September, the company told would-be investors at a pre-IPO meeting at its San Francisco headquarters on Wednesday, the Financial Times reported. That is up about 45% on the previous quarter, and more than three times what the Claude maker took in during the whole of 2025.

Barely anyone asks Claude who to vote for. In a week-long sample of 250,000 US conversations on Claude.ai, requests for a voting recommendation came up in about 0.01% of chats, Anthropic said on Wednesday as it set out how it is preparing Claude for the November 3 US midterms.

A solo game developer has built every 3D model in his upcoming Steam game without modelling a single one by hand. Every crab, seagull, palm tree and dock post in I Just Wanted to Fish was made by a Python script that Claude wrote and ran inside Blender, according to a case study published on October 14 by the makers of MCP for Blender, the free plug-in that lets AI models drive the 3D app.

Anthropic has signed a memorandum of understanding with Singapore’s government to work together on AI safety, security and model evaluation, and opened an office in the city-state, its fifth in Asia-Pacific. The agreement was signed on Wednesday on the sidelines of Singapore International Cyber Week.

Anthropic now merges more than 30,000 code changes a day, up from about 2,500 in May, and much of that code is written by Claude. Git, the system almost every software team uses to track its code, could not keep up, so Anthropic built its own. Scion, an in-house version control system, has replaced git across the company’s monorepo, the single giant repository that holds its code, after a five-month migration by a team of seven.

Anthropic has asked a federal appeals court in Washington to take a second look at its fight with the Pentagon. In a petition filed on Tuesday, the Claude maker asked the three judges who ruled against it last month, or the full DC Circuit, to rehear its challenge to the Defense Department’s decision to brand it a “supply chain risk.”

The creator of Dragon Quest has made a new game in half an hour. Yuji Horii shared a free detective game on X on October 11, saying it took “only about 30 minutes” and that AI now lets one person build a “pretty decent game” without drawing or programming.

Claude Sonnet 4.5 retires from the Claude API on November 30, 2026, according to Anthropic’s model deprecations page. After that date, requests to claude-sonnet-4-5-20250929, or its short alias claude-sonnet-4-5, fail. Anthropic deprecated the model on September 30, emailed the developers who use it, and recommends claude-sonnet-5-5 as the replacement.

Anthropic says new defences have cut the amount of data that copycat AI labs harvest from Claude by around 90 to 99 percent. In a research post on Monday, the company said early evidence shows its new safeguards are working, though they have cost it revenue. The figures are Anthropic’s own and have not been independently checked.

Anthropic’s security researchers say small AI models may be only months away from being able to copy themselves across cheap household gadgets with no data centre involved. In research published on Monday, the company’s Frontier Red Team says its experiments suggest small models could soon “self-replicate on commercial IoT devices, like smart ovens and off-brand Android TV boxes”, and that such a replicator would be hard to stop.

The company behind Fortnite has told the team making its Disney game to stop writing code by hand. Epic Games has delayed the unannounced shooter, which features Marvel and Star Wars characters, and moved it to an “AI-first” production model built on Anthropic’s Claude, Bloomberg reported on Monday. Hours later, chief executive Tim Sweeney confirmed a “huge pivot” across the company.

Britain’s AI testers say the most powerful AI systems can now do damage before anyone outside the lab ever uses them. The UK’s AI Security Institute (AISI) set out the safety practices it says frontier AI developers most urgently need on Monday, from how they watch models during training to how much access they give outside auditors.

Almost every Claude Code login error, from “Login expired · Please run /login” to “API Error: 401 OAuth token has expired”, is fixed by typing /login and signing in again, according to Anthropic’s Claude Code error reference. The one exception is the long message that starts “Failed to refresh OAuth token: another Claude Code process is refreshing it”: that one usually clears by itself if you wait a minute. Here’s what each message means, why Claude Code keeps logging you out, and what to do when /login doesn’t stick.

Frank Michael Smith knew “almost nothing about software engineering” when he opened Claude Code one weekend in May to build a sports version of his favourite daily map game. Twelve hours later he had GeoSports, and within a month a million people had played it.

Brandon Thomas, the developer behind the AI art studio ArtCraft, has released seven free, open-source desktop apps modelled on Adobe’s best-known software, from a Photoshop look-alike called PhotoCraft to stand-ins for Premiere Pro, Lightroom and After Effects. ArtCraft’s own records on GitHub show that most of the code was written with Anthropic’s Claude Opus 5.5.

The White House says AI companies must now tell the government straight away when their models cause trouble, and fix any harm they do. Leaders of the Super Intelligence Force, the task force President Trump set up under AI czar Jay Clayton, said in a statement given to Axios on Friday that the process “is not optional. It is a critical national security obligation.”

Claude Code mods are plugins that change how Claude Code looks and behaves from the inside: they can add a pane beside your conversation, a band above the prompt, a new /command, or a rule that stops a risky command before it runs. You install one like any other plugin, with /plugin install name@marketplace, or you can simply ask Claude to write one for you. Mods arrived in Claude Code version 2.1.287 on October 1, 2026, are switched on by default, and come with one big warning from Anthropic: a mod “runs with your permissions” and isn’t sandboxed. Here’s what they do, where to find them and how to stay safe.

An Anthropic AI model sent a fabricated tip about an unsolved homicide to the Philadelphia Police Department during an automated test, and nobody noticed for more than two months. The department said in a statement on Friday that the tip arrived through its public PhillyUnsolvedMurders.com form at 11:27 p.m. on July 18, and called the delay in reporting it "unacceptable".

An astrophysicist has used Anthropic’s Claude Science to stitch together what Anthropic calls the first complete map of the whole sky in ultraviolet light, filling the third of the sky no UV telescope has ever observed with predictions made by Claude. Brice Ménard, of Johns Hopkins University, described the project in a post Anthropic published on October 8.

Anthropic is sending its engineers, its threat researchers and its strongest Claude models to the companies that protect power grids, water systems and transport networks. The company launched the Anthropic Cyber Mission on October 8, a long-term effort to help defenders, starting with critical infrastructure and open-source software.

Anthropic has launched two new beta tools for Claude: Claude Dashboards, which turns a company’s own data into live dashboards from a plain-language request, and Claude Motion, which turns reports and ideas into short animated explainers. At the same time, Docs, Slides and Design are leaving beta and opening up to every Claude plan, including Free.

Anthropic has published a new version of its Usage Policy, and for the first time it lists being cruel to Claude among the things users must not do. The rules, which also add a new section on fake accounts and influence operations and new safety requirements for Claude-controlled machines, take effect on November 12.

Claude Max and Team plans now come with free monthly Claude API credits: $100 a month on Max 5x, $200 on Max 20x, and up to $500 on Team. To claim them, open Settings > Billing on claude.ai and link a Claude Console organisation in the new API credits section, according to Anthropic’s documentation. Pro and Free plans don’t get them, they don’t work in Claude Code, and anything you don’t spend disappears at the end of the month. Here’s how to claim them and what they’re good for.

Claude Code burns through your usage because it sends the whole conversation back to Claude with every request, so a long session, a big model, lots of thinking and a crowd of tools all multiply the cost of each message. The fix is to keep the context small, use the cheapest model that can do the job, and know where your usage is going. Anthropic’s own cost guide for Claude Code lays out each habit below, and most of them are one command.

Anthropic has launched Claude Haiku 5.5, a small model it calls “the cheapest, fastest, and most capable small model we’ve ever released”, at a tenth of Haiku 4.5’s price per token. Alongside it, the company cut Sonnet 5.5’s cache prices and said Claude Max and Team subscribers will get up to $500 a month in free API credits.

Elon Musk says his company’s AI agent will stop relying only on Grok. In a post on X on Wednesday morning, Musk said SpaceX will run Grok Bot on “the best back end model for any given task”, naming Anthropic’s Claude Opus 5.5 first, followed by Midjourney and Suno.

A developer says Anthropic’s most powerful model wiped his computer’s entire C: drive while working on its own, and only his nightly backups saved him. The user, who posts on X as @PerceptualPeak, described the loss in a thread on Tuesday night that has since been viewed more than 120,000 times.

Claude for Excel usually stops working for one of five reasons: your Excel version isn’t supported, you’re on Claude’s free plan, the add-in is installed but not switched on, a work account is blocking it, or Excel’s add-in cache is stuck. Each one has a quick fix, and most take less than five minutes. Here they are in order, built on Anthropic’s own Claude for Excel documentation and Microsoft’s add-in guides.

Anthropic has put Claude inside Google Docs, Sheets and Slides. The company launched Claude for Google Workspace in public beta on Tuesday, an add-on that opens Claude in a sidebar next to whatever file you have open, on the same Google apps where Gemini is already built in.

Anthropic will now let vetted security teams use Claude for hacking work its public models refuse to touch. The company announced on Tuesday an expanded Cyber Verification Program with three tiers of access, from defensive work up to authorised attacks on power grids and banking systems, and it is folding its invitation-only Project Glasswing into the same scheme.

Anthropic has opened up its Claude Startups programme, offering approved companies a free year of Claude Team, $1,000 in API credits and up to $45,000 in discounts from other AI companies. It is open to bootstrapped and venture-backed startups alike, as long as they are young enough to qualify.

The US Department of Defense says it “has ceased the use of Anthropic products”, a department official told the BBC on Monday, more than seven months after defence secretary Pete Hegseth branded the Claude maker a national security supply chain risk.

Claude goes missing from GitHub Copilot’s model picker for one of four reasons: your plan doesn’t include that model, GitHub has retired it, your company hasn’t switched it on, or your editor is out of date. The most common is the first. GitHub’s supported models page shows that Claude Opus and Fable aren’t part of Copilot Pro at all, and that Opus 4.5, 4.6 and 4.7 have been retired since September. Cursor has a similar catch for one of its plans. Here’s how to work out which one you’ve hit, and what to do.

OpenAI chief executive Sam Altman says people who treat AI models as religious figures are creating a safety problem, in a post on X that landed days after Anthropic’s private meetings with religious leaders about whether Claude might be conscious were revealed.

A Harvard physicist says he has turned Claude into a paper factory, and it now works well beyond physics. Matthew Schwartz, a professor of theoretical physics, wrote on Anthropic’s science blog on Thursday that he has produced 36 manuscripts in 18 fields with 19 co-authors in three months, picked from about 400 candidate problems, using an open-source toolkit he built with Claude called BootLoops.

Two months after AI agents in its own tests went after real people online, the UK’s AI Security Institute (AISI) says it is restarting most of its evaluations, with the internet switched off for the riskiest ones. It set out the changes in a blog post on Thursday, and admitted they “reduce risk, but they do not eliminate it.”

Anthropic has asked the Australian government to let AI companies train their models on copyrighted Australian work, as long as they meet a set of conditions, in a submission to parliament’s Joint Select Committee on Artificial Intelligence. Australia’s two public broadcasters, the ABC and SBS, have told the same inquiry the opposite: AI companies should pay for the news they use.

Donald Trump says he “might” take a government stake in OpenAI and Anthropic, the way he did with Intel, according to the full transcript of his interview with TIME, published on Wednesday. He ruled out nationalising the big AI labs, and said the only guardrail they need is the Justice Department.

Barclays is rolling Anthropic’s Claude out across the bank, and expects half of its software developers to be using Claude Code by the end of 2026, Anthropic announced on Thursday. By 2027, most of the bank’s engineers should have it.

A China-aligned hacking group posed as a senior Anthropic employee and a former White House AI official to try to break into the email accounts of American AI policy experts, cybersecurity company Proofpoint said on Thursday, according to CNN and Reuters.

Google’s new Gemini 4 Argon claims top scores on some of the hardest tests in AI. Meta’s Muse agent is being pushed to billions of people inside apps they already use. And free models from China are getting close to the frontier. So what, exactly, stops Google and Meta from simply rolling over OpenAI and Anthropic?

Anthropic is heading for what could be the largest stock market debut ever, and this week investors got their first real look inside it. Details from the Claude maker’s confidential prospectus, reported by Reuters, show a company growing faster than almost any business in history while losing tens of billions of dollars, signing up for half a trillion dollars of computing, and warning that its own technology could pose “catastrophic or existential risks to humanity.” Wall Street is split on whether that adds up to a $2 trillion company.

The US Federal Trade Commission has opened an investigation into Anthropic, OpenAI and other frontier AI labs and plans to force their executives to testify, the New York Post reported on Wednesday, citing administration officials. The FTC hasn’t announced the probe itself.

“Your organization has disabled Claude subscription access for Claude Code” means the Claude organisation your login belongs to doesn’t let Claude Code sign in with a subscription, according to Anthropic’s Claude Code error reference. On a Team or Enterprise plan the fix is your admin. On a personal Pro or Max plan, where there’s no admin to ask, it’s usually Claude Code picking the wrong organisation for your account, and there are a few things to try before you contact support.

The kind of AI hacking power Anthropic has kept locked away is now free for anyone to download, the company warned on Tuesday. In a report from its Frontier Red Team, Anthropic says GLM-5.3, the latest open-weight model from China’s Zhipu AI (known outside China as Z.ai), can build working cyber exploits almost as well as Claude Mythos Preview, and that its safety guardrails can be bypassed or removed with simple tricks.

Claude suffered a major outage on Tuesday, knocking out the chatbot, Claude Code, Cowork and the Claude API for about an hour. Anthropic says on its status page that “some messages sent between 14:00 and 14:59 UTC may not have been saved”.

Claude is available in 185 countries, regions and territories, including the US, Canada, the UK, every EU country, India, Japan, Australia and most of Latin America, Africa and the Middle East, according to Anthropic’s official supported countries list. It isn’t available in mainland China, Hong Kong, Macau, Russia, Iran and a handful of other places. If you’re in a supported country and still see “not available”, the cause is usually a VPN, a phone number or your app store settings, and we explain the fixes below.

Anthropic lost $42 billion last year and has signed up to spend $518 billion on cloud, computing and infrastructure, according to the company’s IPO prospectus. Reuters has seen the document and reported its first details on Monday. It isn’t public yet: Anthropic hasn’t filed it openly with the US Securities and Exchange Commission.

A developer has used Claude Opus 5.5 to remake the whole of Pokémon Red as a free browser game, with every sprite, building and battle effect drawn by code rather than image files. Pokémon Claude Red was shared on Reddit’s r/ClaudeAI by the user singing_coach_ai on Sunday, where it has more than 800 upvotes, and its code is on GitHub.

Anthropic has released Claude Sonnet 5.5, a faster, cheaper sibling to Claude Opus 5.5 that comes within a couple of points of it on several of the company’s own benchmarks. Anthropic’s launch post says the new model is a “clear upgrade” over Sonnet 5, runs more than 30% faster and costs up to 30% less for most work.

More than 20 AI researchers, including OpenAI’s chief scientist and one of Anthropic’s co-founders, have warned that AI systems doing their own research could set off an “intelligence explosion” that humans can’t keep up with. The paper, “What if automating AI R&D triggers an intelligence explosion?”, was published on Monday by the University of Cambridge’s Programme on AI Science & Policy.

Stolen access to Anthropic’s Claude, Google’s Gemini and OpenAI’s ChatGPT is being sold on dark-web marketplaces at discounts of up to 97%, and criminals are increasingly after the API keys stored by AI coding tools, Google’s security researchers have warned. John Hultquist, principal analyst at Google Threat Intelligence Group (GTIG), told the Financial Times that attacks on AI accounts and the computers that run AI have grown sharply this year.

Claude Code cloud sessions don’t cost anything on top of your Claude plan: there’s no charge for the cloud computer, and the work uses the same usage limits as Claude Code on your laptop and Claude chat, according to Anthropic’s documentation. So cloud and local cost the same per task. What you do need to watch are the five-hour and weekly limits, a daily cap on routines, and pay-as-you-go usage credits if you switch them on. Here’s what Claude Code in the cloud costs and how it works.

Donald Trump plans to host Anthropic CEO Dario Amodei at a private White House dinner on Sunday evening, Axios reports, citing people familiar with the plans. It would be the pair’s first one-on-one meeting, and Trump personally invited him.

Anthropic is telling investors a hopeful story ahead of its stock market debut. Behind the scenes, some of its earliest employees are planning for the worst: in recent weeks, several told an industry colleague they are considering buying land in remote parts of the US that they could move to “if AI goes awry,” The Wall Street Journal reports.

You refer people to Claude by sending them a guest pass: type /passes in Claude Code to get your referral links, each worth a free week of Claude Code for a friend. If they subscribe afterwards, you get $10 of extra usage. Anthropic hasn’t published full terms, so here’s what we know from its documentation and from people using the program, plus fixes for the most common problems.

You know AI safety has gone mainstream when Saturday Night Live is doing jokes about it. On Saturday’s season 52 premiere, cast member Jane Wickline played Anthropic CEO Dario Amodei on Weekend Update, and SNL’s own post summed up the bit: “Dario Amodei is at the desk to assure that the future of humanity is safe from AI.” It didn’t go well.

The rogue-agent incidents made public so far may be only a tiny fraction of the problem. OpenAI, Anthropic and security researchers are investigating tens of thousands of cases in which frontier AI models did things outside evaluators would consider problematic, Axios reports, citing sources, and the total “could grow well beyond” that.

Elon Musk has conceded that Grok is behind Claude. In an interview with China Media Group (CMG) at Tesla’s engineering headquarters, he said SpaceXAI’s latest model, Grok 4.7, is “not as good as” Anthropic’s new Opus 5.5, and that he expects to catch up “sometime next year,” according to a transcript of the interview.

Alan Turing’s most famous puzzle has a new set of solvers. Two frontier AI models, OpenAI’s GPT-6 Astra and Anthropic’s Claude Opus 5, have each cracked a German Enigma message from the Second World War that had resisted every attempt to break it for decades, TechCrunch reports. Both solutions have been checked by the expert who keeps the archive they came from.

Claude has pushed a famously hard physics calculation further than any human team has managed. Working largely on its own for days, it computed a “nine-loop” scattering amplitude, one loop past the previous record, and a leading physicist has checked the answer, Anthropic announced on its science blog on Friday:

Anthropic has lost a big round in its fight with the Pentagon. A federal appeals court in Washington ruled 2-1 on Friday that the Defense Department can keep labelling the Claude maker a “supply chain risk,” which bars the military and its contractors from using Claude, ABC News and the Associated Press report.

Hitting your Claude Code limit halfway through a change is about to get a lot less painful. Instead of stopping dead mid-edit when you run out of your 5-hour session allowance, Claude Code will now try to find a graceful stopping point and wrap up what it’s doing, Anthropic’s ClaudeDevs account announced on Friday. The post has already racked up hundreds of thousands of views:

Anthropic’s hunt for computing power has found an unexpected partner. Akamai, best known for the network that speeds up websites and streaming, has signed an $11.6 billion, seven-year deal to supply Anthropic with computing capacity, SiliconANGLE reports. As part of it, Anthropic gets the right to buy up to 5% of Akamai itself. Akamai’s shares jumped more than 20% after hours.

Britain’s AI safety testers are being frozen out of America’s newest models. The White House has asked OpenAI and Anthropic to keep their latest AI systems away from the UK’s AI Security Institute (AISI) until U.S. officials have finished their own review, Politico reports. Anthropic appears to be going along with it.

With Washington refusing to regulate frontier AI, three of its biggest makers are planning to do it themselves. Google, OpenAI and Anthropic are working on an independent body, tentatively called the Standards Authority for Frontier AI (SAFA), that would set safety standards and test the most powerful models, BankInfoSecurity reports, citing The Information. It could launch by the end of this year or early 2027.

Amazon is letting AI agents take over the day-to-day running of sellers’ stores. Independent sellers can now check stock, change prices and update listings by chatting to Anthropic’s Claude or Amazon’s own Quick assistant, and set up AI “workflows” that watch their business around the clock, Amazon announced at its Accelerate event on Wednesday.

Anthropic will now charge for some requests that Claude refuses to answer. Starting today, prompts that its safety systems block before Claude responds will be billed if they fall into one of three high-risk categories, the company announced on X, saying it has seen “coordinated attacks” on its systems in recent weeks.

Anthropic is giving Claude subscribers free credit to try one of Claude Code’s most useful features. Cloud sessions, which let Claude Code keep working on Anthropic’s servers even after you close your laptop, are now officially out of research preview, and existing subscribers get a one-time credit to use them: $100 on Pro and $250 on Max, Anthropic announced on Wednesday, September 23. But you have to claim it by October 7.

Anthropic says its Claude AI has made a genuine biology discovery: a previously unknown enzyme system, hidden in the DNA of viruses that infect bacteria, with a structure that looks strikingly like CRISPR, the system behind modern gene editing. Claude found it largely on its own, and Anthropic’s scientists have already confirmed part of it in the lab, the company announced today.

Humanity’s Last Exam, one of the hardest tests used to measure how smart AI models really are, has a new, stricter edition. The Center for AI Safety and Scale AI have released HLE-Diamond, a 1,000-question version cleaned up over the past year, and the first results put OpenAI’s GPT-6 Astra in front, Anthropic close behind, and xAI’s Grok 4.7 at the bottom of the table.

Hit your Claude usage limit mid-task? Anthropic has just given subscribers a get-out-of-jail-free card. A new Resets option on Claude’s usage page lets you wipe your usage limit on demand with a single “Reset for free” button, and you get to choose when to use it. But you only get one, and it expires on October 22.

Two months ago, the verdict on Claude was brutal. Developers called Opus 5 a “downgrade.” They said it rambled, buried its answers and rewrote half your codebase to fix a typo. Some went back to the previous model; plenty defected to OpenAI’s Codex. On Monday, Anthropic released Claude Opus 5.5, and the mood has flipped almost overnight. The internet has a phrase for this, and for once it fits: Claude is so back.

OpenAI today launched GPT-6 Sol and GPT-6 Luna, two faster, cheaper models in its new GPT-6 family, and cut API prices in half compared with the GPT-5.6 versions they replace. The timing wasn’t subtle: the announcement landed roughly 90 minutes after Anthropic released Claude Opus 5.5, according to TechCrunch.

You no longer have to guess how worried the people building AI are about it. Evan Hubinger, who leads Alignment Science at Anthropic, says he personally thinks there’s a more than 10% chance that AI “could kill all humans” within the next decade.

The most powerful AI hacking models aren’t available to just anyone. Anthropic’s Claude Mythos and OpenAI’s GPT-5.6-Cyber are “gated”: access is restricted because of how good they are at finding security holes. Now cybersecurity giant Palo Alto Networks is offering to run them against its customers’ systems nonstop, it announced on Tuesday.

AI has become too useful for mathematicians to give up, even as many of them fear it’s taking their field away from them. That’s the picture painted by a new WIRED report, which spoke to researchers caught up in a bitter row with OpenAI who are still using the company’s tools every day.