Codex Changed Its Default Model and Retired GPT-5.5 Within 15 Days

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Between September 29 and October 14, a series of OpenAI Codex updates altered which model users get by default. A pull request gave GPT-6.1 Sol top priority in the bundled model catalog, so sessions without an explicit model choice began using it. Codex CLI 0.162.0 on October 8 made new terminal threads follow server-side model defaults unless launch overrides were specified. GPT-5.5 was retired from Codex for ChatGPT sign-ins on October 14, affecting users who had pinned that model but not those using API keys. The author argues that developers should pin models explicitly per task and record which model produced each result so evaluations remain comparable.

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