Anthropic Releases Fable 5.2 and Mythos 5.2, Cutting API Price by 20%

November 10 — According to Anthropic's official website, Anthropic has released Claude Fable 5.2 and Claude Mythos 5.2. The two are the same underlying model: Fable comes with cybersecurity and biological safeguards and is open to all users, while Mythos requires an application through the cybersecurity or life sciences verification program. The new models bring improvements in coding, reasoning and vision, with output speed up to 30% faster than version 5.1, and API pricing lowered to $8 per million input tokens and $40 per million output tokens (previously $10 and $50 for Fable 5.1).

The company said Fable 5.2 scored 49.1% on the FrontierCode 2.0 evaluation (Xhigh effort), the highest among released models it has tested. Fable 5.2 is available starting today on the Claude platform as well as on AWS, Google Cloud and Microsoft Azure.