InferenceBench: Claude Opus 5.5 posts 12.08x speedup, first agent to beat hyperparameter search
maksym_andr · x · 2026-09-25
The InferenceBench team reports a landmark result: Claude Opus 5.5 becomes the first AI agent in the benchmark's history to outperform hyperparameter search, with a 12.08x speedup versus 9.83x for Fable 5.1.
When InferenceBench launched, search beat every agent tested. The tables have now turned, which the team calls a milestone for agent capabilities.
Related event: Claude Opus 5.5 First AI Agent to Beat Hyperparameter Search, 12x Speedup(3 posts)→
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