Story
GPT-5.5 Codex reasoning-token clustering may be leading to degraded performance
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Overview
GPT-5.5 Codex exhibits a pattern where reasoning output tokens cluster at 516, 1034, and 1552. This clustering may correlate with degraded performance on complex tasks.
Summary from github.com.
Reports
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Community reactions
Each reaction summarizes sampled comments from the linked discussion.
Hacker News · github.com
Hacker News discussion ↗
Historical count: 5 · 5 saved in sample · Historical sample
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Based on 5 sampled comments from this thread. Analyzed 2026-07-05.
- Praise: Some users are exploring alternatives like GLM 5.2 to avoid reliance on inconsistent performance from Codex and Claude, indicating a search for better options.
- Praise: Commenters are sharing their experiences of switching between Codex and Claude, highlighting the competitive landscape and encouraging others to find the best fit for their needs.
- Concern: Users are reporting significant drops in Codex's performance, claiming that the once-reliable quality has evaporated, leading them to switch to alternatives.
- Concern: There's a pervasive sentiment that performance degradation is a business decision rather than a technical issue, suggesting distrust in the motives behind the changes.
- Concern: Commenters are expressing frustration over the lack of consistent performance and the expectation that users should tolerate the ups and downs of non-deterministic systems.