OpenAI Model Retirement October 23, 2026: 29 Model IDs (gpt-4, gpt-3.5-turbo, o1)

Short answer: OpenAI shuts down 29 legacy model IDs on October 23, 2026, according to its published deprecations page. These include gpt-3.5-turbo, gpt-4, gpt-4-turbo, gpt-4o-2024-05-13, gpt-4.1-nano, o1, o1-pro, o3-mini, o4-mini, gpt-image-1, and fine-tunes built on gpt-3.5-turbo, gpt-4, gpt-4.1-nano, o4-mini, babbage-002 and davinci-002. After that date, requests to these IDs stop working. OpenAI recommends gpt-5.6-sol, gpt-5.6-terra or gpt-5.6-luna for text models and gpt-image-2.5-sunburst or gpt-image-2.5-flare for gpt-image-1. Source: OpenAI deprecations page.

Last checked against vendor sources: 2026-10-23. OpenAI deprecation page

Add the shutdown calendar (iCal).

Use the snapshot column when you migrate. An alias in the same row uses that snapshot's date.

This date is still ahead. The rows below use the published shutdown date only. OpenAI deprecation page · OpenAI on SunsetDiff · Shutdowns in 2026-10

Which OpenAI model IDs are shutting down on October 23, 2026?

Add the shutdown calendar (iCal).

What happens after the shutdown date

OpenAI announced this shutdown on April 22, 2026. OpenAI's deprecations page says: "At the time of the shut down, the model or endpoint will no longer be accessible."

Self-serve fine-tuning follows the base model. Inference on a fine-tuned model is disabled when that base model is deprecated.

How to find these model IDs in your code

GET /v1/models can return an optional shutdown_date for each model. The value is a YYYY-MM-DD date, or null when OpenAI has not set one. Scan your code for the ids in this table. The calendar lists the other shutdown dates.

Not in this batch

GPT-4o snapshots gpt-4o-2024-08-06 and gpt-4o-2024-11-20, and GPT-4.1, are on the January 14, 2027 page. gpt-image-1-mini and gpt-image-1.5 are on the December 1, 2026 page. Only gpt-4o-2024-05-13 from the GPT-4o family is in this October 23 batch.

Azure OpenAI uses its own dates. See Azure OpenAI. The dataset is the CC BY 4.0 download of these rows.

Request errors

Calls that still use these model ids fail once this date arrives. These pages record the error text SunsetDiff could verify.

• The model has been deprecated
• Unsupported parameter: 'max_tokens' is not supported with this model. Use 'max_completion_tokens' instead.

Migration checklist

1. Find every request that still uses these model ids before October 23, 2026.
2. Point each request at the replacement in the table. If a cell says "Not published", the provider did not name one.
3. Open the source link on each row and read that page before you switch.
4. Run the scan page on your code to catch the ids in this table.

Scan your code for these model ids. Each migrate link opens the diff for that model.

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