Anthropic has released its second major update to the Claude Fable 5 model since its June debut, introducing the Fable 5.2 and Mythos 5.2 versions. These new models demonstrate significant improvements in coding, reasoning, and vision capabilities. Key enhancements include faster output generation, with speeds up to 30% quicker than the previous 5.1 versions, and a reduced pricing structure of $8 per million input tokens and $40 per million output tokens.
Positioned as best-in-class for ambitious technical work, the update emphasizes clearer communication and stronger engineering judgment. Anthropic notes that over 90% of changes to its core codebase are now written by Claude with human guidance, highlighting the model's growing role in software development. The release also includes increased Fable usage for subscribers on eligible paid plans, with reset allocations based on subscription length.
For most coding and knowledge tasks, Anthropic recommends starting with Claude Opus 5.5 before switching to Fable or Mythos depending on project complexity. The upgrade reinforces Anthropic's strategy of offering tiered AI capabilities, with Fable serving as the most capable model above the Haiku, Sonnet, and Opus series.
Source: 9to5Mac · Summarized by HeadlinesBriefing