anthropic Archives

Claude Cowork heads to mobile and the web; is mostly used for office tasks

Cowork is moving to the cloud, where it can be accessed from everywhere. (Picture: Anthropic)

Anthropic is freeing Cowork from the computer, transferring relevant files, emails and notes to continue your tasks in the cloud long after you’ve left the home/office.

That means you can now set up Cowork on your computer, close it, and have projects run independently, sending updates and confirmation requests to your phone or the web.

While releasing this update, Anthropic is also revealing a few usage stats for the app. It turns out, it is hardly used for coding or software design at all.

Rather, 90% of usage is knowledge work and business operations; things like drafting memos and reports from raw data, or turning a contacts list or transcripts into sales leads.

These are routine tasks that involve a lot of data parsing or housekeeping that are essential parts of office work, but is rarely advertised. Anthropic calls it «work around the work.»

The new features should be available on claude.ai and in the sidebar of the iOS or Android apps, rolling out «over the next several weeks» for Max users, with «more plans to follow.»

Read more: Anthropic’s announcement, launch thread, TechCrunch and The Verge.

Fable 5 will eat up all your tokens, some users say, as Anthropic resets limits

Fable 5 is the most expensive model from Anthropic, and it uses *a lot* of subagents. (Picture: Anthropic)

Just as people are digging into their allocation of Claude Fable 5 usage on the paid tiers, they are running up to another wall: The model is very expensive and will chew through your alotted tokens in no time at all.

One ML engineer on reddit said it tore through a 5 page research paper while comparing it to a whitepaper with 174 subagents to review the results from 7 original agents and «ate through my max 20x 5 hour limit in ~15 minutes.»

X reactions
User BridgeMind on X said he paid $321 for Opus 4.8 to do all the work, while X user Adam Door posted that it burned through his $200 Max subscription in ~30 minutes, and yet another post says «Fable 5 burned 28% of my weekly limit AND used up my 5 hour limit with two prompts in about 30 minutes.»

Continue reading “Fable 5 will eat up all your tokens, some users say, as Anthropic resets limits”

US government lifts restrictions on Anthropic’s Fable 5

Fable 5 spooked the government enough to ban it, but now it’s back online with even stronger safeguards. (Picture: Shutterstock)

As of July 1, the Mythos-class model is available on wide release to paying customers, after the Commerce department lifted their export controls on June 30.

Anthropic hails the news, but cautions that recent events have highlighted the need for a «consistent way to assess and fix potential «jailbreaks,»» after two weeks of grueling exchanges with the administration.

Commerce secretary Howard Lutnick said on X that they had «worked closely with Anthropic to […] ensure alignment across the US Government and strengthen America’s leadership in AI,» Axios reports.

The Fable 5 model became somewhat of a joke in the AI community for having such strong safeguards that it would not answer anything even remotely related to security or biology, but Amazon engineers got it to output code for an exploit, leading to the export ban on June 12.

This behavior is now blocked 99% of the time, and Anthropic has agreed to even further safeguards on the model, pledging to work even more closely with the government in the future, including on vetting pre-release models.

Read more: Anthropic’s announcement and X post, Lutnick’s letter, Axios, Politico, CNBC.

Chinese model GLM-5.2 almost reaches parity with Opus 4.8 in coding, cyber

Opus 4.8 was released in May, meaning the gap to Chinese models has closed considerably. (Picture: generated)

While not matching GPT-5.5 or Opus 4.8 across the board, the GLM-5.2 is the first open model to come within spitting distance (about 1% on some tests) on coding and cybersecurity tasks at open source benchmarks.

That means Chinese AI lab Z.ai is catching up to cyber capabilities considered by some to be too dangerous to release publicly, and is edging closer to Mythos or GPT-5.6.

The concern is that the new model, released on June 16, is open source and open weight with an MIT license — meaning that anyone can adjust its guardrails and play around with it on any computer capable of running it.

That has researchers worried that China is not only catching up, but that the model might find its way into the hands of bad actors — who will be supercharged when looking for hacking targets, causing what they term «bugmaggedon.»

With Mythos and GPT-5.6 being blocked by the US government, security teams might be tempted to turn to these models at a sixth of the cost of the American frontier, especially as they develop further, notes benchmark provider Semgrep.

Read more: Z.ai’s presentation with benchmarks, Semgrep tests, The Wall Street Journal, and The Verge. Discussion on r/Singularity and Hacker News.

US government clears Mythos 5 for limited release to «trusted partners»

Mythos 5 will become available on Project Glasswing after the government lifts its ban. (Picture: Shutterstock)

After two weeks of purgatory and almost daily explanatory meetings, Commerce Secretary Howard Lutnick sent a letter to Anthropic on Friday, clearing one of two models on hold for release:

— I have determined that appropriate safeguards are in place to permit certain trusted partners to access the Claude Mythos 5 Model, he writes to chief compute officer Tom Brown, according to Semafor, who scooped the story.

Mythos 5 was only intended for a limited release through the Glasswing project, for use by a trusted set of government agencies and corporations to test their cyber defenses.

UPDATE: On Saturday, Axios is reporting that Fable 5 might be next in line, with «insiders» predicting it might be released next week, and Anthropic anticipating access «soon.»

The letter also says that «Anthropic has committed to work with the U.S. government on protocols and standards and releases,» and talks are progressing toward a release of Fable, though «the timeline is unclear,» according to Semafor.

Read more: Scoop by Semafor, comment from Anthropic, Reuters, CNBC, and Politico.

Speaking in «different languages,» Anthropic struggles with White House

Finding themselves thrust into politics, Anthropic is having difficulty getting through, Axios reports. (Picture: Shutterstock)

As security researchers and executives are urging a retreat from the Mythos ban, Axios is reporting that Anthropic is failing to «communicate effectively.»

They were scheduled to meet in person with the White House on Monday, sources tell CNBC, and are now finding themselves deeply enmeshed in current politics.

Government officials are now candidly telling Axios that Anthropic «screwed» them, saying they failed to «honor» the recent Executive Order on AI — which calls for a 30-day vetting period for new models, and are calling Anthropic a «bad actor.»

There are also differing narratives in the Axios report, where on the one hand, Anthropic says they «received explicit approval» to deploy Fable, and another where the administration threatened export controls several weeks ago, fearing the model could be exploited by bad actors.

The exploit uncovered in the Fable and Mythos models are replicable in other frontier and open source models, security researchers say in an open letter, and shutting down Fable at a critical time gives an advantage to attackers over defenders. They say there is only a 90-day window until Chinese models reach the same capabilities.

Read the Axios report here, also see the security researchers’ open letter, reports on euters, CNBC and Politico.

Anthropic disables Mythos 5 and Fable 5 after Commerce intervention

Commerce Secretary Howard Lutnick has enacted export controls on the new models, banning their use in any foreign countries and by foreign nationals — and Anthropic responded quickly by completely blocking access for everyone.

The triggering factor appears to be that a company was able to jailbreak the models, potentially getting them to perform harmful actions, an administration official tells Axios.

According to Anthropic, the claim concerns a limited jailbreak and a «minor vulnerability,» not considered a systemwide issue, and says it is impossible to guarantee against this 100% for any model by any provider.

Continue reading “Anthropic disables Mythos 5 and Fable 5 after Commerce intervention”

Reports: Fable 5 won’t answer even simple questions on its restricted topics

Hardly any questions about cybersecurity, biology or chemistry get through to Fable 5. (Picture: Shutterstock)

As more people are testing out Anthropic’s new, Mythos-class Fable 5, many are finding it so restrictive it wont even answer the most basic questions, TechCrunch writes.

The Verge tested it on the fundamentals of biology and found it wouldn’t even answer «easy» questions, about cell membranes or on how mRNA vaccines work.

TechCrunch is reporting on several developers who are complaining that just including the word «cyber» in a query is enough to trip it up, while others say it even refuses to write «secure» code, thinking it might be cybersecurity related.

In order to release the Mythos-based model, Anthropic made a tradeoff on very strict limits for it, and the fallback option is the still very capable Claude Opus 4.8, released in late May.

These tight restrictions aren’t by mistake, Anthropic says;

— To deploy Fable 5 safely, we believe it was necessary to be overly conservative with our safeguards so they block most queries tied to biology work, Anthropic spokesperson Paruul Maheshwary told The Verge.

Read more: TechCrunch and The Verge.

Anthropic releases Mythos-class Fable 5 and Mythos 5, with strong safeguards

Fable 5 uses a second AI to monitor throughput and prevent misuse. (Picture: Anthropic)

After refusing to release any Mythos models for fear of abuse of its advanced cyber firepower, Anthropic has finally come up with enough safeguards to make it to general rotation. Its capabilities «exceed those of any model we’ve ever made available,» they say.

— The capabilities of models like Fable 5 and Mythos 5 have the potential to do profound good for the world, Anthropic writes in its presentation, and adds — We’ve also seen it in life sciences research, where the models are positing novel hypotheses and speeding up the development of new therapeutics.

Continue reading “Anthropic releases Mythos-class Fable 5 and Mythos 5, with strong safeguards”

Anthropic says 80% of code for Claude is written by Claude, calls for slowdown

Human review might take more time than writing the code in the near future, Anthropic says. (Picture: Anthropic)

Recursive self-improvement may come sooner than we are prepared for, the AI lab says in a new report.

They are now foreseeing a not-so-distant future where Claude can autonomously write and improve on itself, and is warning that humans might lose control.

Compared to 2021-2025, Anthropic is now producing 8x more code with AI tools, and this rate is doubling every four months, approaching a point where human judgment could become the bottleneck in software design.

With the more capable Mythos Preview model, researchers at the company estimate they could output another 4 times as much code on top of the already accelerating trend.

There is no sign of this progress stopping, and Anthropic is now calling for a global slowdown so that society has time to adapt. Even if growth did stop, or somehow development stalled, we are only just beginning to scratch the surface of adopting the already existing technology, the lab says.

Read more: Anthropic’s report, launch thread summary, Axios, The WSJ. DIscussion on r/Singularity.

Anthropic confidentially files paperwork for Initial Public Offering

The company says the filing does not mean it will announce going public any time soon, but some speculate it might come as early as this fall, according to The New York Times.

The documents submitted to the Securities and Exchange Commission detail operations, and typically include potential risks, C-suite compensation «and other financials,» The Verge writes.

The filing of the S-1 form, the public declaration on finances and risks, will come at a later date, Anthropic says, and will be determined by «market conditions and other factors.» They only need to file a prospectus fifteen days before publicly soliciting stocks, CNBC reports.

An actual IPO from Anthropic is expected to be massive, as the recent fundraise at a $965 billion valuation would indicate. The company has an annualized run rate of some $47 billion, but investors are more keen to see the gross margin, which has been kept secret in its entirety since inception, according to Reuters.

OpenAI is also expected to file an IPO in short order, and with SpaceX already filing, it sets up a blockbuster year for market debuts.

Read more: Anthropic’s announcement, The New York Times, CNBC, The Verge, and market comments from Reuters.

Anthropic ships «more honest» Opus 4.8, teases Mythos release

Anthropic’s latest tops the benchmarks and makes fewer mistakes. (Picture: Anthropic)

The new model comes just over a month after the last one. It is four times less likely to allow flaws in code or make unsupported claims, and is «more likely» to say so when it is uncertain about a reply.

Releasing today at the same price as 4.7, it can tackle problems at a larger scale and has an upgrade to the «fast mode» — which is now three times cheaper.

There is also a new setting for Claude where users can set the «effort»-level on a given task. More effort costs more tokens, but gives a more precise answer, while low effort won’t bust rate limits.

The new Opus is of course on top of all the benchmarks so far in the cycle, and it is supposedly also sharper and more reliable in its judgement.

At the same time, Anthropic has some news about the code-busting Mythos model, previously deemed too dangerous to release.

The company says it is making headway on the safeguards needed to make it safe enough for public use, and plans to bring «Mythos-class» models to their customers «in the coming weeks.»

Mythos finds 10K severe bugs in a month, as Anthropic widens release

Anthropic is now expanding availability for government and qualifying security teams. (Picture: Shutterstock)

Officially dubbed the Claude Mythos Preview, Anthropic’s code-busting agent has worked with about 50 partners to find ten thousand high-severity bugs in the month since release:

— Progress on software security used to be limited by how quickly we could find new vulnerabilities. Now it’s limited by how quickly we can verify, disclose, and patch the large numbers of vulnerabilities found by AI, Anthropic says.

Of those vulnerabilities, 6,202 were serious finds in open source software, where Anthropic has partnered with «more than 1,000» projects. Mythos actually found 23,019 bugs, but most were estimated at medium or low severity.

— Models with similar cybersecurity skills to Mythos Preview will soon be more broadly available, says Anthropic.

— There is a clear need for a larger effort across the software industry to manage the volume of findings that these models will generate.

Therefore, Anthropic is widening the release of Mythos, making it available to «qualifying» security teams «on request.» In the future, they say they hope to develop safeguards strong enough to make it generally available, but no such safety features exist as of today.

Read more: Anthropic’s findings and Engadget. Discussion on r/cybersecurity

Anthropic aims for first profitable quarter in Q2, with $559 million in the green

Anthropic is reaching for profits, but compute costs might be a damper. (Picture: Shutterstock)

Last quarter ending in March saw an 80-fold growth for Anthropic and a revenue of $4.8 billion, a record for the AI lab.

Next quarter will be even better, sources are telling Reuters and WSJ — projecting a revenue growth of 130% and landing at $10.9 billion, more than double their previous number.

That should land them an operating profit of $559 million, Reuters reports.

This unprecedented growth underscores how Claude has boomed in the new year for coders and enterprises alike, that OpenAI is racing to catch up to.

The Wall Street Journal does however warn that this growth in subscribers also translates to higher computing costs, that might put a significant dent in their yearly profits.

Both OpenAI and Anthropic are expected to file for IPOs in the near future, and OpenAI might file in the coming weeks.

Read more: Reuters, WSJ, and TechCrunch.

Anthropic approves $30 billion in funding at a $900 billion valuation

The huge funding haul would surpass OpenAI’s record valuation of some $852B in April, and comes hot on the heels of Anthropic rebuffing bids at a mere $800B valuation recently.

Their last funding round was at a $380 billion valuation in February, which is less than half of todays numbers just three months ago.

The news was first reported by The Financial Times, who says the round is co-led by Dragoneer Investment Group, Greenoaks Capital, Sequoia Capital, and Altimeter Capital, all offering $2B each, while Anthropic is in talks with «additional investors.»

Anthropic has been on a tear lately, growing its user base 80-fold last quarter, and struggling with the compute power needed, but this is now largely solved.

They are also expected to pass $45 billion in annualized revenue «shortly,» which is five times what they had at the end of last year, Investing.com writes.

Read more: Financial Times (paywalled), The Information (paywalled), and Investing.com.