Anthropic launches Fable 5.2 and restricted Mythos 5.2

Anthropic announced Claude Fable 5.2 and Claude Mythos 5.2 on November 9, offering the first broadly and restricting direct access to the second to approved organizations working in cybersecurity and life sciences. The company says the models improve coding, reasoning and vision, and generate output up to 30% faster than their 5.1 predecessors.

The models share an underlying system but differ in safeguards. Fable is available broadly with protections for sensitive cybersecurity and biological tasks. Mythos has fewer of those restrictions and is available directly only through Anthropic’s verification programs. Enterprise customers can also access Mythos vulnerability-scanning features through Claude Security, according to the company.

Anthropic set standard API prices for both models at $8 per million input tokens and $40 per million output tokens, down from $10 and $50 for the previous versions. That is a 20% reduction in each rate. The company also offers an optional fast mode, which it says can increase generation speed by up to 2.5 times at higher prices.

Anthropic reported that Fable 5.2 scored 49.1 on its FrontierCode 2.0 benchmark at the Xhigh effort setting, compared with...