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As companies continue to burn through billions of dollars by running massively resource-hungry AI models — and only passing on a fraction of the costs to consumers and enterprise clients — the AI race shows no signs of slowing down.
On Thursday, a data leak caused by a major security lapse in its public-facing content management system revealed that Anthropic is working on a powerful new model release.
The company has since officially acknowledged the new project, dubbed “Claude Mythos,” with a spokesperson describing it to Fortune as a “step change” in AI proficiencies and the “most capable we’ve built to date.”
The spokesperson said it’s a “general purpose model with meaningful advances in reasoning, coding, and cybersecurity.”
In an enormously ironic twist, a draft blog obtained by Fortune, which was “available in an unsecured and publicly-searchable data store,” claimed that the new model “poses unprecedented cybersecurity risks.” In other words, let’s hope the new model wasn’t responsible for the security of Anthropic’s company blog.
It’s a major test for the company, which has received significant media attention as of late for its Claude Code and Claude Cowork tools, the successes of which appear to have rattled Anthropic’s competitors, including OpenAI, to their core.
The leaks also revealed a “new tier” of AI models, dubbed Capybara. Mythos appears to be part of this new tier, but how Capybara fits in with Anthropic’s existing tiers — Opus, Sonnet, and Haiku, in decreasing size, capability, and cost — remains to be seen.
“Compared to our previous best model, Claude Opus 4.6, Capybara gets dramatically higher scores on tests of software coding, academic reasoning, and cybersecurity, among others,” the leaked blog reads, as quoted by Fortune.
While it may score higher in cybersecurity tests, it could simultaneously represent a major challenge for existing cybersecurity defenses, the company warned.
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