#extended thinking

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A sealed kraft-paper holdout-problem envelope caught half over the threshold of an open steel security cage, its tamper tape peeled back on one corner beside an open custody ledger with a pen resting mid-stroke

OpenAI and Claude on Formal Reasoning: What the Benchmarks Show, and Where They Mislead

AIME, GPQA and FrontierMath test different things by different rules. Reasoning effort and extended thinking are documented settings, not fixed traits, and a right answer does not certify the reasoning behind it.

By Brecht Corbeel · August 12, 2026 · 16 min read

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