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GPT-5.2 Thinking sets SOTA on SWE-Bench Pro at 55.6%

development2025-12-12

Claim

GPT-5.2 Thinking set a new state of the art on SWE-Bench Pro at 55.6%.

Reported metric: 55.6%

Reporting date: (not necessarily the event date)

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Issue 001 tracked Anthropic’s slope toward saturating SWE-bench Verified; a day later the reported frontier is a different lab on a harder variant.

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