Microsoft Foundry / Azure OpenAI · model
gpt-4.1-nano deprecation: shutdown date & replacement
Shuts down in 18 days (October 14, 2026)
- Provider
- Microsoft Foundry / Azure OpenAI
- Name
- gpt-4.1-nano (2025-04-14)
- Type
- model
- Announced
- —
- Shutdown
- Replacement
- —
- Source
- Official Microsoft Foundry / Azure OpenAI notice
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.
Same model on other platforms
- OpenAI — October 23, 2026
Questions
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.