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OpenAIGuides & TipsOfficial Docs

OpenAI Updates Assistants API Migration Guide with Sunset Date

Existing Assistants API users can plan a safe migration before the shutdown.

Key Points

1Assistants API deprecated with a clear shutdown date
2Responses API recommended as functionally equivalent replacement
3Concepts reorganized from Assistants/Threads/Runs to new model
4New implementations should use Responses API from the start

OpenAI has deprecated the Assistants API and published a migration guide to the Responses API. The Assistants API will be discontinued on August 26, 2026, requiring existing users to transition. Developers must adapt conversation and tool invocation concepts to the new API.

📎 Source: Official Docs