OpenAI Assistants API: Has Shut Down
What happened
OpenAI deprecated the Assistants API (announced August 26, 2025) and shut it down on August 26, 2026. OpenAI's migration guide now states the API is no longer available.
What affected users could do (refunds & data export)
Developers had to move to the Responses API + Conversations API; OpenAI published a migration guide but no automated tool, so old thread history now has to come from messages your own app stored. Note that reusable Prompt objects, which the guide pointed Assistants to, are themselves scheduled to shut down on November 30, 2026.
What to use instead
Looking for a developer / api replacement? Tools LegitTool has profiled include Jasper , Copy.ai , QuillBot . Whatever you pick, run it through our trust check first, and browse our reviews to see who actually stands behind it.
Frequently asked questions
Is OpenAI Assistants API shut down?
Yes. OpenAI Assistants API shut down on August 26, 2026. OpenAI deprecated the Assistants API (announced August 26, 2025) and shut it down on August 26, 2026. OpenAI's migration guide now states the API is no longer available.
Can I get a refund from OpenAI Assistants API?
Based on the verified source: no paid plan affected. Developers had to move to the Responses API + Conversations API; OpenAI published a migration guide but no automated tool, so old thread history now has to come from messages your own app stored. Note that reusable Prompt objects, which the guide pointed Assistants to, are themselves scheduled to shut down on November 30, 2026.
How do I get my data out of OpenAI Assistants API?
Developers had to move to the Responses API + Conversations API; OpenAI published a migration guide but no automated tool, so old thread history now has to come from messages your own app stored. Note that reusable Prompt objects, which the guide pointed Assistants to, are themselves scheduled to shut down on November 30, 2026.
What can I use instead of OpenAI Assistants API?
Reviewed alternatives include Jasper, Copy.ai, QuillBot. Vet any replacement with our trust check before paying.
Source
OpenAI Assistants migration guide ↗ — every entry on this tracker is verified against its source before publishing.
← Back to the full AI Tool Shutdown Tracker. Tools changing their terms short of a full shutdown are on our policy-change alerts.