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OpenAI Assistants API

The Assistants API is tracked as an API lifecycle record because OpenAI has announced a planned sunset path toward the newer Responses API.

deprecatedConfidence: highEvidence 1Reviewed 2026-06-05

Current state

OpenAI Assistants API

OpenAI indicates that the Assistants API will be sunset after the Responses API reaches full feature parity, with a target sunset in the first half of 2026.

Last known URL: https://developers.openai.com/api/docs/deprecations

Key facts

Operator
OpenAI
Status
deprecated
Entity type
api
Country
United States
Launched
2023
Ended / changed
Not confirmed
URL status
live verified
Last reviewed
2026-06-05

Primary evidence

OpenAI API deprecations

OpenAI · official docs · high reliability

Open source

Timeline

Dated lifecycle events

1 events
  1. 2025-03-11
    Assistants API sunset path announcedapi_deprecated

    OpenAI documented a sunset path for the Assistants API after feature parity with the Responses API, with a target sunset in the first half of 2026.

Evidence

Source links supporting this record

1 links
  • OpenAI API deprecationshigh

    OpenAI · official_docs · Accessed 2026-06-05

    Supports: api_deprecated, sunset_path, current_state

Known unknowns

  • Exact retirement timing depends on OpenAI’s final sunset announcement.

Correction path

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