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GPT-5.5 Codex Has a 516-Token Reasoning Ceiling — Hard Data Shows It Is Breaking Complex Tasks

2026-07-05 · 4 min read

A developer published a detailed analysis on OpenAI Codex issue tracker this weekend showing that GPT-5.5 responses cluster disproportionately at exactly 516 reasoning tokens, with secondary spikes at 1034 and 1552. The pattern is model-specific, has been worsening since February, and correlates with a measurable drop in reasoning intensity across 390,195 response records.

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