# gpt-4-turbo-preview

Calls to the model gpt-4-turbo-preview on OpenAI stopped working on March 26, 2026.

## The error OpenAI returns once gpt-4-turbo-preview is gone

HTTP 404

```json
{"error":{"message":"The model `gpt-4-turbo-preview` has been deprecated, learn more here: https://platform.openai.com/docs/deprecations","type":"invalid_request_error","param":null,"code":"model_not_found"}}
```

## What to use instead

Move to gpt-5.6-sol. gpt-5, named first, stops working on 2026-12-11. gpt-4.1, named first, stops working on 2027-01-14.

- API: OpenAI (api.openai.com)
- Model: gpt-4-turbo-preview
- Kind: Model retirement
- Takes effect: March 26, 2026
- Calls after that day: fail
- Calls it hits: `model gpt-4-turbo-preview`
- Source: [Deprecations page](https://developers.openai.com/api/docs/deprecations)
- Verified: November 6, 2026, against OpenAI's own pages
- Page: https://www.okapi.bot/models/openai/gpt-4-turbo-preview/

## OpenAI's words

> Shutdown date: 2026‑03‑26; Model / system: gpt-4-0125-preview (including gpt-4-turbo-preview and gpt-4-turbo-preview-completions , which point to this snapshot); Recommended replacement: gpt-5 or gpt-4.1*

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent