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GPT-5.2 Beats Claude Opus 4.5: A Deep Dive into the Anthropic Performance Challenge

May 7, 2026·3 min

GPT-5.2 Beats Claude Opus 4.5: A Deep Dive into the Anthropic Performance Challenge

A developer used GPT-5.2 with Codex CLI to beat Claude Opus 4.5's 1487-cycle benchmark with 1243 cycles in Anthropic's official performance challenge, achieving 119x speedup.

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