OpenAI kills the original Codex API on three days' notice

The model that started the category is deprecated with a March 23 shutoff — 'our latest models are now our best models for coding' — pushing developers to GPT-3.5-Turbo and GPT-4. Specialized code models lose to generalists, for a while; the Codex name returns as an agent in 2025.

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The Chronicle timeline →The firehose →This week in coding agents →