(Ludovic Marin/Getty Images)

Anthropic raises $65 billion at a $965 billion valuation, releases a more “honest” Claude Opus 4.8

Anthropic’s monster $965 billion valuation puts it firmly ahead of OpenAI’s $850 billion valuation as the rivals head toward expected IPOs later this year.

Jon Keegan

5/28/26 2:46PM

Anthropic announced it has raised $65 billion in a series H fundraising round, with a staggering valuation of $965 billion. The round was led by Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital.

The official valuation puts Anthropic well ahead of archrival OpenAI’s reported $850 billion valuation as both companies jockey to be the first to pull off an IPO later this year. It also recently skipped further ahead of OpenAI on generating annual recurring revenue.

In addition to the fundraising news, Anthropic also released Claude Opus 4.8, less than six weeks after its last version. The incremental update to Anthropic’s flagship AI model ekes out a better benchmark score for agentic coding tasks, multidisciplinary reasoning, and financial analysis.

The company says Opus 4.8 is more “honest,” and is less likely to be overconfident and make claims that it cannot support.

The release rolls out a few new features as well. “Effort control” allows users to control how much effort Claude exerts for a response — where a greater effort could result in a higher cost for the user.

For longer, more complex tasks, Anthropic has rolled out a new feature called “dynamic workflows,” which allows for the use of hundreds of agents on tasks like huge code migrations.

The company says Claude is the first frontier model available on all three major cloud hyperscalers: Amazon Web Services, Microsoft Azure, and Google Cloud.

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While gaming industry groups may not like it, there’s been a huge change in the methods people are using to put money on the big games, with everyone from fortunate NYC bar owners, to a far less fortunate Spanish supporter, turning to prediction markets to try and turn their sports know-how into cold, hard cash.

According to a new report from Adam Blacker for apptopia, that shift might have been even more seismic than imagined in the wake of the NBA and NHL finals and around the 2026 World Cup kicking off.

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Anthropic pulls Fable and Mythos access worldwide after Trump administration bars their use by foreign nationals

Only days after releasing two versions of its next-gen AI model, Anthropic has disabled them for users worldwide.

Anthropic says it received a Friday night order from the Trump administration to suspend access to the models for any foreign national (anywhere in the world) — a group that included some Anthropic employees. In response, the company turned off access to everyone.

Last week, the company released to the public its much-anticipated Claude Fable 5 model (and its restricted version Claude Mythos 5, which is still being tested with trusted partners). Anthropic said in a blog post announcing the action that officials cited national security concerns with the new models, while offering few specific details.

The post said that the government gave the company “verbal evidence of a potential narrow, non-universal jailbreak” of the public Fable 5 model. A jailbreak is a means by which users can evade restrictions built into the code to unlock prohibited functionality. Anthropic downplayed the significance of the attack, and said other major models, such as OpenAI’s GPT-5.5, could also be affected by the technique described.

Fears of these first Mythos-class models being misused are running high, after Anthropic warned the cybersecurity world in May that the advanced cyber capabilities of Mythos have rapidly discovered thousands of vulnerabilities in ubiquitous software, leading to the decision to restrict the full version of the model to a close group of trusted partners for testing.

This morning, Axios reported that Anthropic technical staff have flown to Washington to meet with White House officials to resolve the issue.

The Wall Street Journal is reporting that the Trump administration’s decision to take action against Anthropic was prompted by discussions that Amazon CEO Andy Jassy had with officials, including Treasury Secretary Scott Bessent. According to the report, Amazon researchers said they had been able to evade some of Fable 5’s security restrictions using specific prompts. Amazon is a major investor in Anthropic.

Anthropic is currently suing the US government to fight the Pentagon’s blacklisting of the company on national security grounds.

Statement on the US government directive to suspend access to Fable 5 and Mythos 5