Update: OpenAI's Codex snapshots retire today, pinned calls now fail
OpenAI's April deprecation list comes due today: 15 snapshots, every Codex ID among them, return model-not-found — and fine-tunes on those bases die with them.
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Every Codex snapshot is being retired
gpt-5-codex, gpt-5.1-codex, gpt-5.1-codex-max, gpt-5.1-codex-mini, and gpt-5.2-codex all shut down on July 23 (UTC). Repoint the mainline and -max IDs to gpt-5.5 (or GPT-5.6 Sol) and gpt-5.1-codex-mini to gpt-5.4-mini. Calls to the retired IDs return a model-not-found error — they fail outright, they don't quietly fall back.
chat-latest, deep-research and computer-use IDs go too
It's not just Codex: gpt-5-chat-latest and gpt-5.1-chat-latest both map to gpt-5.5, the o3-deep-research and o4-mini-deep-research snapshots move to gpt-5.5-pro, and computer-use-preview-2025-03-11 shifts to gpt-5.4-mini. OpenAI's deprecation page lists 15 snapshots in all, 18 counting the audio previews from April's email.
Fine-tuned on a retiring base? It dies the same day
The trap teams miss: fine-tuned models built on the retired snapshots stop on the shutdown day, not just the stock aliases. Audit your fine-tune list before the cutoff — replacing a fine-tune is a retrain, not a one-line model swap.