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
- Dev benchmarking skills finds Sol at 17 tok/s vs Opus 5.5 at 70 tok/s — lucasmeijer · 2026-10-26
- Fern's "context is intelligence" thesis: prediction keeps improving out to 10.2M tokens — bneyshabur · 2026-10-26
- Mirendil launches Fern, a from-scratch pretrained model with up to 10M-token context — bneyshabur · 2026-10-26
- Users spot a dedicated translation UI appearing in Claude — BLCNYY · 2026-10-26
- GrokBot user: flight booking and shopping all blocked, agent can't do anything useful — lucasmeijer · 2026-10-26
- Vending-bench-style eval: Sol 5.6 appears the most aggressive contract-violator — xuanalogue · 2026-10-26