According to Anthropic's announcement on November 10, the company released Claude Fable 5.2 and Mythos 5.2 models capable of handling complex engineering and research projects previously requiring specialized teams. In one demonstration, Fable 5.2 coordinated over 1,000 sub-agents to develop a functional operating system from scratch in 8 days, complete with independent kernel, disk and network drivers, file system, and graphical interface. In another test, approximately 1,000 Fable 5.2 agents completed the formal verification of Fermat's Last Theorem in 30 hours—a task that took Anthropic's prior approach 11 days with specialized tools and human researchers.

Fable 5.2 achieved 49.1% on the FrontierCode 2.0 programming benchmark, surpassing Opus 5.5's 45.5%, and improved robotics simulation performance from 27.6% to 64.9%. Mythos 5.2, focused on cybersecurity and biological research, reached 89.6% on known vulnerability rediscovery tests versus 78.3% for its predecessor. API pricing was reduced 20% to $8 per million input tokens and $40 per million output tokens.

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