Introducing Claude Fable 5.2 and Claude Mythos 5.2
Summary
- Anthropic introduced Claude Fable 5.2 and Claude Mythos 5.2, models designed for complex technical challenges featuring improved coding, reasoning, and vision capabilities.
- Fable 5.2 is available to all users with robust cybersecurity and biology safeguards, while Mythos 5.2 access is restricted via verification programs.
- The models generate outputs up to 30% faster than previous versions and are priced at $8 per million input tokens and $40 per million output tokens.
- Fable 5.2 scored 49.1% on FrontierCode 2.0 at Xhigh effort, outperforming other tested released models on agentic coding benchmarks.
- Internal testing demonstrated Fable 5.2 coordinating over 1,000 subagents to build a working prototype operating system over eight days.
Why it matters
The release of Claude Fable 5.2 and Mythos 5.2 establishes new benchmarks in agentic coding, hardware design, and scientific reasoning while lowering token generation costs. These models expand the boundaries of autonomous software engineering and multi-agent systems.