OpenAI · api
assistants-api deprecation: shutdown date & replacement
Shut down August 26, 2026
- Provider
- OpenAI
- Name
- Assistants API
- Type
- api
- Announced
- Shutdown
- Replacement
Responses API,Conversations API- Source
- Official OpenAI notice
Section header dated 2025-08-20; text says developers notified August 26, 2025.
How to migrate off assistants-api
- Find every place that references it:
grep -rn --exclude-dir={node_modules,.git,dist} "assistants-api" . - 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 APIs.
- Check config outside code too: environment variables, feature flags, prompt-management tools, and fine-tuned model references.
- Deploy before August 26, 2026, and add the CI scanner so it cannot come back.
Questions
Is assistants-api deprecated?
Yes. OpenAI has deprecated assistants-api. It was shut down on August 26, 2026.
When does assistants-api shut down?
August 26, 2026, according to OpenAI's official deprecation notice.
What should I use instead of assistants-api?
OpenAI recommends Responses API, Conversations API. Switch the model ID and re-test your prompts, since outputs, pricing and limits can differ.
What happens to requests to assistants-api 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.