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Claude Fable 5.1 made me a really nice animated pelican

Simon Willison · Sep 01, 2026 · Product Launches

Claude Fable 5.1 sets a new standard with impressive benchmark scores.

“Fable 5.1 "sets a new standard for coding, knowledge work, and long-running problem-solving tasks".”

Anthropic announced Claude Fable 5.1, which achieved a score of 52.6% on the new Terminal-Bench-Science benchmark, significantly improving from its predecessor. This upgrade aims to enhance capabilities in coding and problem-solving tasks, indicating a notable advancement in AI model performance.

benchmark AI model Claude Fable

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