How good is Claude Fable 5.2 at controlling robots? What does 64.9% mean?

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Author’s note: A closer look at Claude Fable 5.2’s 64.9% on RoboDojo Sim: under what conditions it achieved that score, how it compares with Opus 5.5 and GPT-6 Astra, what it doesn’t prove, and the costs and limitations to weigh before integrating it. Here’s the bottom line. On RoboDojo Sim, run internally by Anthropic at … Read more