Anthropic's Claude Fable 5 model, part of the Claude 5 family, configured with high-effort extended thinking mode.
Last 12 weeks · weekly buckets. New tools get more accurate as observation weeks add up.
Where builders who adopted this model actually run it — distribution by adopters.
The claude-fable-5 model is Anthropic's most capable flagship model, used for the most demanding reasoning and long-horizon autonomous agent work. With always-on thinking and a 1M context window, it suits hard, long-running tasks such as complex refactors and overnight autonomous coding runs.
Builders choose it for large multi-file changes, extended agent runs, and design or debugging that needs deep reasoning. It helps keep consistent judgment across long-context work.
It is a flagship option when top-tier reasoning and execution matter more than cost or latency.
It is Anthropic's top flagship model with always-on thinking and a 1M context window, used for hard reasoning and long-horizon agent work.
Complex refactors, long autonomous coding runs, and design or debugging that needs deep reasoning.
When they need top-tier reasoning quality and consistency across long-context tasks.
Per available summaries, thinking stays on, which suits hard, long-running work.