Microsoft Foundry / Azure OpenAI · model

`gpt-4.1-nano` deprecation: shutdown date & replacement

Shuts down in 18 days (October 14, 2026)

Azure lifecycle stage: Deprecated. Version 2025-04-14.

How to migrate off gpt-4.1-nano

Find every place that references it:

grep -rn --exclude-dir={node_modules,.git,dist} "gpt-4.1-nano" .

Follow the provider’s migration notes in the official notice.
Re-run your evals or a sample of real prompts — output style, token usage and pricing can change between models.
Check config outside code too: environment variables, feature flags, prompt-management tools, and fine-tuned model references.
Deploy before October 14, 2026, and add the CI scanner so it cannot come back.

Is gpt-4.1-nano deprecated?

Yes. Microsoft Foundry / Azure OpenAI has deprecated gpt-4.1-nano. It shuts down on October 14, 2026.

When does gpt-4.1-nano shut down?

October 14, 2026, according to Microsoft Foundry / Azure OpenAI's official deprecation notice.

What should I use instead of gpt-4.1-nano?

Microsoft Foundry / Azure OpenAI has not named a specific replacement. Check the official source for current models.

What happens to requests to gpt-4.1-nano after the shutdown?

Requests using the retired model ID fail with an error, so any code still calling it breaks. Update and deploy before the shutdown date.