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On a difficult new SWE benchmark, ProgramBench, GPT5.5 high/xhigh solves a task for first time, significantly outperforms Opus 4.7

Reddit r/singularity ↗ · 2026-05-12

GPT5.5 achieved the first solve on the difficult ProgramBench SWE benchmark, significantly outperforming Opus 4.7.

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