Claude Fable 5.2 (xhigh) scores 43.0% on WeirdML v3, taking the lead ahead of GPT 6 Astra.
Astra is ahead on token efficiency, but Fable gets a significantly higher final score.
The only task that Fable makes no significant progress on is Mystery Box without any hints.
Introducing WeirdML v3, a fully agentic benchmark featuring 11 complex hand-made tasks.
Models must explore and understand unfamiliar data, develop ML and data analysis pipelines and produce results despite limited data, unspecified goals and/or very limited feedback.
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