Claude Fable 5 is a proprietary AI model of the new "Mythos class" developed by Anthropic, released on June 9, 2026, and positioned above Opus 4.8 in the model hierarchy. It stands out for its long-term autonomous agency, strong Coding and Reasoning capabilities, as well as Vision understanding, and is offered through the Claude API, cloud platforms (AWS, Vertex AI, Microsoft Foundry), and Claude apps. The model achieved high scores on Coding Benchmarks such as SWE-bench Pro (80.3%) and was used, among other things, to disprove the 87-year-old Jacobian conjecture.

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