Anthropic announced Monday the release of two new versions of its AI models, Claude Fable 5.2 and Mythos 5.2. The company claimed that the models are among its most capable ever, with improvements to coding, reasoning, and vision. Notably, the frontier lab claimed that its new models were able to solve two previously unsolved black hole physics problems, design working electronic devices, and produce a computer-verifiable version of the proof of Fermat’s Last Theorem, among other breakthroughs.

Fable 5.2, which will become the company’s most powerful publicly available model, is the company’s highest-performing yet for “open-ended technical work.” It surpasses previous iterations of Anthropic’s models in several benchmarking tests for agentic capabilities, including coding tasks. It also outperforms competing frontier models on several of these evaluations, according to Anthropic’s testing.

Per Anthropic, while its latest iterations of its most powerful models have improved performance, they are also cheaper to run than previous versions. The company claims that outputs can be generated up to 30% faster than Fable 5.1 and Mythos 5.1 were able to spit out, while cutting prices to $8 per million input tokens and $40 per million output tokens for both models—making them slightly cheaper than OpenAI’s most powerful model, GPT-6 Astra.

And while benchmarking and pricing are the universal metrics that models get compared across, the real thing companies love to do when a new model drops is tout just what they were able to get it to do. Anthropic has no shortage of examples of what it views as brag-worthy capabilities.

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