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Anthropic has announced Claude Opus 5, a model meant to deliver nearly the full intelligence of the flagship Fable 5 at the same price as Opus 4.8. It is the company's fourth new model in under two months.
Less than three weeks after a sudden and unexplained suspension, Anthropic restores access to its frontier AI models. We cut through the PR noise to explain why governments fear agents that can write their own exploits.
Anthropic announced the first computer-checked proof of Fermat's Last Theorem in Lean, built by Claude in eleven days: 13.4 million lines of code, independently verified by a separate kernel. It's not new mathematics. It's proof that large-scale autoformalization works.
Anthropic released Fable 5.1 and Mythos 5.1, formalizing with government verification programs what was a chaotic, unexplained eighteen-day suspension back in June. Mythos 5.1 also beats Fable 5.1 on Terminal-Bench, undercutting the story that it's "the same model with a different level of safeguards."
Anthropic is negotiating a public offering valued at at least $2 trillion, which would beat SpaceX's record. The company's revenue crossed $65 billion annualized, fourteen times what it was a year ago.
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