Codex in GPT-5.5 Mode Keeps Calling Itself GPT-5 with Old Cutoff
CtrlAltDwayne · x · 2026-07-08
Users discovered that when OpenAI Codex is set to GPT-5.5 xhigh mode, it consistently identifies as GPT-5 in all new conversations and reports a knowledge cutoff of June 2024, contradicting its actual configuration. This reveals a discrepancy between the model's self-identification and its actual version settings, serving as a notable heads-up for developers using Codex.
More from Models
- OpenAI upgrades Decisions API: 400 questions per call, native voice and image support — OpenAIDevs · 2026-10-26
- Fangcun AI, China's first independent frontier AI safety lab, launches with DeepSeek eval report — JacquesThibs · 2026-10-26
- When AI hits an existential crisis: model confuses itself and everyone else — Ok-Delivery-7437 · 2026-10-26
- Kimi K3.1 Pro tops MathArena open models, closing frontier gap to about 6 months — teortaxesTex · 2026-10-26
- Ruff creator Charlie Marsh: frontier models find infinite bugs in any software — charliermarsh · 2026-10-26
- Dev testing one skill across Opus 5.5 and Sol 6.1 finds instruction following 'all over the map' — lucasmeijer · 2026-10-26