OpenAI Assistants API Shut Down: Migrate to the Responses API
Quick answer
The Assistants API was shut down on August 26, 2026. Port to the Responses API: Assistants become Prompts, Threads become Conversations, Runs become Responses.
Most likely fix: Map the concepts
How to fix it
Try these in order — the most common fix is first.
1. Map the concepts
- Assistant -> Prompt (dashboard), Thread -> Conversation, Run -> Response
Did this fix it?2. Recreate instructions and tools
- Move instructions and tool config into Prompts or request parameters
Did this fix it?3. Move stored data
- Export thread messages and import them into new Conversations yourself
Did this fix it?4. Update the SDK
- Upgrade the OpenAI SDK and use client.responses.create
Did this fix it?
Symptoms
Calls to /v1/assistants, /threads and /runs fail after the shutdown.
Why it happens
- Assistants API removed 2026-08-26
- No automated thread migration
- Hardcoded assistant IDs
This guide also covers
- openai assistants api shutdown
- assistants api to responses api migration
- openai assistants api deprecated
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