GPT-5.6 vs. Claude Fable 5 for Physical AI, which performs best?
SMRTR summary
JuliaHub tested four frontier AI models on physical modeling tasks — Claude Fable 5, GPT-5.6 Sol, Terra, and Luna — scoring them on whether their physics was actually correct, not just whether code compiled. Fable scored highest (0.889) but cost $9.60 per trial, while Sol placed second (0.814) at just $1.74. Crucially, switching AI harnesses mattered more than switching models.
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