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Proof Bench

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11:09
2026-09-26
vibeleaderboard.ai
artificial-intelligence

Use medium reasoning effort for proofs; max mostly adds cost

Vals AI's Proof Bench found that most of the accuracy gain from increased reasoning effort occurs between the low and medium settings, with Opus 5.5 reaching 99% at medium effort for far less cost tha…

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artificial intelligence 1 large language models 1 ai research 1