👤 Claude Fable 5 Person

Endor Labs benchmarked Claude Fable 5 on 200 real-world vulnerability-fixing tasks for the Agent Security League and found mixed results. Overall, the model performed only moderately well, scoring 59.

Anthropic announced Claude Fable 5 and Claude Mythos 5 on June 9, 2026. Fable 5 is a Mythos-class model made safe for general use and is described as the company’s most capable generally available mod