# gpt-3.5-turbo, gpt-4, gpt-4-turbo, o1, o3-mini and o4-mini shut down on 2026-10-23 (Responses API)

- **Provider:** OpenAI
- **Endpoint:** `POST /v1/responses`
- **Effective:** 2026-10-23
- **Severity:** medium
- **Change:** version-sunset
- **Status:** verified

## What changed

On 2026-10-23 OpenAI shuts down gpt-3.5-turbo (0125), gpt-4 (0613), gpt-4-1106-preview, gpt-4-turbo, gpt-4.1-nano, gpt-4o-2024-05-13, o1, o1-pro, o3-mini and o4-mini, plus fine-tunes of gpt-3.5-turbo, gpt-4, gpt-4.1-nano and o4-mini. This advisory covers calls to the Responses API (POST /v1/responses) that send one of these model names (or their aliases); they fail from then on. openai-legacy-gpt-o-series-shutdown-2026-10-23 covers chat completions.

## What to do

Search request bodies and config for these model names and switch them: gpt-3.5-turbo and o4-mini to gpt-5.6-terra; gpt-4, gpt-4-1106-preview, gpt-4-turbo, gpt-4o-2024-05-13, o1 and o3-mini to gpt-5.6-sol; o1-pro to gpt-5.6-sol with reasoning.mode: pro; gpt-4.1-nano to gpt-5.6-luna. Re-run fine-tunes on the new base models. The same model names also stop working on the Responses and legacy Completions endpoints.

## Sources

- Provider notice (2026-04-22): https://developers.openai.com/api/docs/deprecations

## Machine-readable

- Advisory: https://github.com/SriVarshini09/shapi-advisories/blob/main/advisories/openai-legacy-gpt-o-series-shutdown-2026-10-23-responses.json
- OSV: https://shapi.dev/osv/openai-legacy-gpt-o-series-shutdown-2026-10-23-responses.json