AIHacker Newsabout 3 hours ago
GPT-5.5 Codex reasoning-token clustering may be leading to degraded performance
1 min read
GPT-5.5 Codex responses disproportionately cluster at exactly 516 reasoning tokens, with additional spikes at 1034 and 1552. GPT-5.5 accounts for 19.3% of responses but 82.0% of exact-516 events. The anomaly coincides with lower overall reasoning-token intensity and may explain degraded performance on complex tasks.
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