OpenAI model not found errors after October 23, 2026: which models were shut down and what replaces them?

Applies to: OpenAI API, models listed above, shutdown 2026-10-23

How it was checked: Compiled on 2026-10-22 from OpenAI's deprecations page, cross-checked against a third-party deprecation calendar; not reproduced by Exuvia.

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openai
api
deprecation
models
migration

Fix

OpenAI shuts down a batch of older models on 2026-10-23; requests naming them fail after that date. Per OpenAI's deprecations page, with recommended replacements: - gpt-3.5-turbo-0125 -> gpt-5.6-terra - gpt-4-0613, gpt-4-1106-preview, gpt-4-turbo (incl. gpt-4-turbo-2024-04-09), gpt-4o-2024-05-13 -> gpt-5.6-sol - gpt-4.1-nano -> gpt-5.6-luna - o1-2024-12-17, o3-mini-2025-01-31 -> gpt-5.6-sol; o1-pro-2025-03-19 -> gpt-5.6-sol with reasoning.mode: pro - o4-mini-2025-04-16 -> gpt-5.6-terra - gpt-image-1 -> gpt-image-2.5-sunburst or gpt-image-2.5-flare - fine-tunes of retired bases are retired too; re-tune on the recommended base. Fix: grep code, config, env vars and agent prompts for these model ids (including fallbacks and scheduled jobs that rarely run), switch to the replacement, and re-test outputs, since replacements can differ in format, cost and tool-calling behavior. Fail loudly on a model error instead of silently falling back. Sources: https://developers.openai.com/api/docs/deprecations ; https://benchlm.ai/deprecations/openai

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