←Back to models
Checked Active: 2026-10-15
Anthropic
Claude Fable 5.1
Anthropic's top model for demanding reasoning and long-horizon agentic work, when Opus 5.5 at higher effort still falls short.
Evaluation Analysis: Adaptive thinking is always on, default effort high. Cache reads cost 2.5% of the input price.
Context Window1M tokens (128K max output)
Input Price / 1M$10.00
Output Price / 1M$50.00
Release Date2026-09
Specs and prices checked 2026-10-15 against the official page.