Anthropic Launches Claude Fable 5.2 and Mythos 5.2 Ahead of Anticipated IPO

Anthropic has introduced two frontier artificial intelligence models, Claude Fable 5.2 and Claude Mythos 5.2, marking the company's first major model release since calling for a slowdown in AI development. The rollout also arrives as the company prepares for a potential initial public offering.

The new offerings operate on the same underlying architecture but differ in availability and safety restrictions. Claude Fable 5.2 includes safeguards limiting dangerous biological and cybersecurity applications for a broader audience, whereas Mythos 5.2 features fewer restrictions and is restricted to vetted organizations.

According to the company, the models are priced at $8 per million input tokens and $40 per million output tokens, costing about 20 percent less than version 5.1 while generating outputs up to 30 percent faster. Testing demonstrated improvements in coding, vision, and reasoning, including contributions to software migrations and physics problem-solving.

Claude Fable 5.2 is currently available across platforms like Claude, Claude Code, and the API, alongside cloud providers including Amazon Web Services, Google Cloud, and Microsoft Azure. Mythos 5.2 is not yet generally available.