OpenAI model churn
OpenAI has been retiring and reshuffling models in ChatGPT while repositioning Codex as a paid developer tier, signalling quick product turnover rather than a static API landscape. The Help Center lists several retired models (GPT‑4o, GPT‑4.1, GPT‑4.1 mini, o4‑mini and GPT‑5 variants) while business customers retain access through custom deployments, and the Economic Times reports OpenAI launched a $100 Pro Codex plan and introduced GPT‑5.3 Codex. That combination means product-facing engineering must plan for provider churn and tiered access rather than assuming single‑model stability. (help.openai.com) (economictimes.indiatimes.com)
OpenAI keeps changing the menu while people are still ordering. In ChatGPT, the company says GPT-4o, GPT-4.1, GPT-4.1 mini, OpenAI o4-mini, and even GPT-5 Instant and GPT-5 Thinking were retired on February 13, 2026. (help.openai.com) That is a product change, not a full shutdown. OpenAI says application programming interface access stays unchanged, which means a model can disappear from the ChatGPT picker while still existing for developers who call it directly. (help.openai.com) The replacement names tell you what OpenAI wants people to use next. OpenAI’s Help Center says retired ChatGPT models are being mapped to GPT-5.3 Instant and GPT-5.4 Thinking and Pro equivalents instead. (help.openai.com) Even the exceptions had an expiration date. OpenAI said ChatGPT Business, Enterprise, and Edu customers could keep GPT-4o inside Custom GPTs only until April 3, 2026. (help.openai.com) At the same time, OpenAI is turning Codex into its own paid lane. OpenAI’s developer pricing page lists Codex plans from Free to Go at $8, Plus at $20, and Pro at $200 per month for individuals. (developers.openai.com) Then a new middle tier appeared. TechCrunch and The Economic Times reported this week that OpenAI launched a $100-per-month Pro plan aimed at developers who want more Codex capacity without paying the full $200 tier. (techcrunch.com) (economictimes.indiatimes.com) The selling point was not a new chatbot personality. The new $100 plan offers 5 times more Codex than the $20 Plus plan, according to TechCrunch and other reports on the launch. (techcrunch.com) (msn.com) Codex here means OpenAI’s coding agent, not just a model name. OpenAI describes GPT-5.3-Codex as a “Codex-native agent” built for longer real-world software tasks, and its pricing page says the newest Codex models can arrive first in paid Codex tiers before application programming interface users get them. (openai.com) (developers.openai.com) That changes the old assumption that one provider equals one stable model. OpenAI is now separating three things that used to feel bundled together: the ChatGPT model picker, business-only custom deployments, and Codex access sold by usage tier. (help.openai.com) (developers.openai.com) So the practical lesson is boring and expensive in exactly the way infrastructure lessons usually are. If a team builds prompts, evaluations, and budgets around one named OpenAI model inside ChatGPT, that team now has to plan for retirement dates, replacement mappings, and features that move behind a different subscription tier with very little warning. (help.openai.com 1) (help.openai.com 2)
