Claude Fable 5.1 for Business Automation: What Changed and What It Costs
On the benchmark that measures automating actual business processes, Claude Fable 5.1 scored 31.4% — up from 17.1% for Claude Fable 5, released three months earlier. Anthropic calls that benchmark AutomationBench. A near-doubling in one release cycle is the number worth stopping on, because most of the automation work I build for clients lives or dies on exactly that capability: can the model…
Claude Fable 5.1, the latest version of Anthropic's flagship model for coding and knowledge work, was released on September 1, 2026. This incremental upgrade to Claude Fable 5 offers significant improvements in automation capabilities and cost efficiency. According to Anthropic's benchmark, AutomationBench, Claude Fable 5.1 scored 31.4%, a nearly doubling from 17.1% for Claude Fable 5, showing substantial gains in agentic coding and research benchmarks.
The model maintains its 1M-token context window and 128K maximum output, while introducing per-message effort control and optimized secret detection. Pricing for Claude Fable 5.1 remains the same as its predecessor, at $10 per million input tokens and $50 per million output tokens, with cache reads now costing 75% less at $0.25 per million tokens.
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