GPT-5.5
Everything on Ground Truth tagged “GPT-5.5” — 1 item.
GPT-5.5 Codex Keeps Cutting Its Own Reasoning Off at Exactly 516 Tokens News
A GitHub analysis of 390,195 coding-session responses found GPT-5.5 disproportionately cuts off its own reasoning at exactly 516 tokens, a pattern likely caused by a batching bug rather than an intentional change.