Claude Fable 5.1 Replaces Fable 5 with Lower Cache Costs and Better Benchmarks

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Anthropic released Claude Fable 5.1 on September 1, 2026, as the successor to Claude Fable 5, which remains available until at least June 9, 2027. The new model retains the same input and output pricing at $10 and $50 per million tokens, but cuts cache read costs from $1.00 to $0.25 per million tokens. Fable 5.1 also shows notable benchmark improvements over its predecessor, particularly in agentic coding, multi-step research, and document generation tasks. However, the upgrade introduces breaking changes, including a 400 error for forced tool calls and stricter conversation history editing rules on accounts created after August 31, 2026. Users are advised to run compatibility tests before migrating, while those relying on Priority Tier support may be better off staying on Fable 5 for now.

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