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These past couple of days, a heated issue has blown up in the Codex community.
The core question is simple: Why, even when users explicitly select gpt-5.5 + xhigh, do some complex tasks only think for a brief moment before immediately spitting out an answer?
Even more striking is that many local logs show the exact same number: 516.
On GitHub, someone opened a very technical issue whose title roughly translates to: “gpt-5.5 in Codex exhibits fixed reasoning-length clustering at 516 / 1034 / 1552, potentially linked to degraded performance on complex tasks.”
The issue was still open at the time of writing. The author analyzed Codex local records from February 1 to June 27, 2026 — a total of 390,195 response-level token records across 865 sessions.
The most glaring numbers are:
