Claude Fable 5.1 made me a really nice animated pelican
Anthropic launched Claude Fable 5.1, claiming gains in coding and long-running tasks, with 52.6% on Terminal-Bench-Science 0.1.
Anthropic released Claude Fable 5.1 (alongside Mythos 5.1), positioning it as a new standard for coding, knowledge work, and long-running problem-solving. The model scores 52.6% on Terminal-Bench-Science 0.1, up from 24.7% for Fable 5, versus 29.0% for Opus 5 and 22.4% for GPT-5.6 Sol. Simon Willison's hands-on test found the model produced an impressive animated pelican, though he notes other benchmarks show only slightly improved scores.
- Claude Fable 5.1 scores 52.6% on Terminal-Bench-Science 0.1, more than double Fable 5's 24.7%.
- Anthropic touts the model for coding, knowledge work, and long-running problem-solving tasks.
- Gains on other benchmarks are described as slight rather than step-change improvements.
- Organizations
- Anthropic
From the original article
Today is Claude Fable (and Mythos) 5. 1 day . Anthropic say that Fable 5.
simonwillison.net
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