Assistants API status
OpenAI's page states that the Assistants API was sunset on August 26, 2026 and recommends the Responses API for new integrations. Older guides that tell you to rebuild a GPT as an Assistant are out of date.
How the concepts map
| Assistants API | Responses API equivalent |
|---|---|
| Assistants | Prompts: a prompt holds the model, tools and instructions (created in the dashboard, versioned) |
| Threads | Conversations |
| Runs | Responses: you send input items and receive output items |
| Run steps | Items |
OpenAI notes that reusable prompt objects are being deprecated, so check the deprecation timeline before relying on them long term. The page we reviewed does not cover file search or vector stores; read the Responses API documentation for that.
What you still build
- A chat interface and hosting.
- Knowledge retrieval from your files.
- Tool calls to replace your Actions: Actions migration.
- Rate limits and key protection if the bot is public.
This path suits developers or teams with budget for a custom build. Otherwise consider simpler options.
Not sure it is simple enough to do yourself?
Tell us what your GPT does, whether it uses Actions and how many files it has. We will say what will break and what a rebuild involves. The audit is free.
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