Claude Fable 5.1 Launches with Lower Cache Costs and Stronger Agent Performance

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Anthropic released Claude Fable 5.1 on September 1, 2026, as the successor to Claude Fable 5, maintaining the same input and output pricing at $10 and $50 per million tokens respectively. The new model cuts cache-read costs from $1.00 to $0.25 per million tokens, offering meaningful savings for workloads that repeatedly access cached context. Benchmark figures published by Anthropic show Fable 5.1 outperforms its predecessor across all tested tasks, with the largest gains seen in long-horizon agentic work such as scientific terminal tasks and business workflow automation. Compatibility between the two versions is high, as existing Fable 5 prompts are expected to run on Fable 5.1 without modification. Claude Fable 5 will remain available until at least June 9, 2027, giving teams time to evaluate whether migration is worthwhile for their specific workloads.

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