Anthropic releases Claude Fable 5.2 and Mythos 5.2 at a lower price

Anthropic released Claude Fable 5.2 and Claude Mythos 5.2 on 9 November 2026, and says Fable 5.2 is offered from launch on every platform, among them Microsoft Azure, Google Cloud and Amazon Web Services. Developers can call it on the Claude Platform as claude-fable-5-2.

Anthropic says the two names cover one underlying model. Fable carries safeguards in cybersecurity and biology and is open to every user, while organisations doing cyber or biomedical work can apply for Mythos through the company's verification programmes.

Anthropic says the 5.2 models cost less than before: $8 for each million input tokens and $40 for each million output tokens. An optional fast mode costs $16 and $80 on the same basis. The company says the 5.2 models generate text as much as 30% quicker than the 5.1 versions, and that fast mode raises generation speed by as much as 2.5 times.

On FrontierCode 2.0, an agentic coding benchmark, Anthropic reports that Fable 5.2 scored 49.1% at its Xhigh effort setting. Its table gives Opus 5.5 45.5% at Max effort, GPT-6 Astra 42.8%, Gemini 4 Carbon 41.1% at Medium effort and Fable 5.1 32.4%. Anthropic calls its FrontierCode results early testing, and the scores are its own.

The one chip the page names is a single NVIDIA H200 GPU, in a footnote on a protein-modelling experiment: Anthropic says the method Claude Mythos 5.2 devised for predicting the structure of an AAV2 virus capsid ran for roughly 58 minutes on it with OpenFold3-preview2, and for roughly seven with ESMFold2.