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Claude Fable 5.1 Cost: Three Benchmarks, Two Answers, and Your Cache Hit Rate Decides Which One You Get

Anthropic released Claude Fable 5.1 on September 1, 2026 saying it "will cost an estimated 25% less than Fable 5 for typical workloads," with savings up to roughly 45% on highly agentic work. In…

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AI 11 min read Updated Sep 8, 2026