# gpt-3.5-turbo-instruct

Calls to the model gpt-3.5-turbo-instruct on OpenAI stopped working on September 28, 2026.

- API: OpenAI (api.openai.com)
- Model: gpt-3.5-turbo-instruct
- Kind: Model retirement
- Takes effect: September 28, 2026
- Calls after that day: fail
- Calls it hits: `model gpt-3.5-turbo-instruct`
- Source: [Deprecations page](https://developers.openai.com/api/docs/deprecations)
- Page: https://www.okapi.bot/models/openai/gpt-3.5-turbo-instruct/

## What to use instead

Move to gpt-5.6-terra, recommended by OpenAI.

gpt-5.6-terra is not served on /v1/completions. Move the call to Chat Completions (/v1/chat/completions) or the Responses API (/v1/responses): the prompt string becomes messages or input, and the text comes back in a message rather than choices[].text.