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OpenAI API changes
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Documentation section changed: 2025-08-20: Assistants API

doc:019fb619-9a96-7dbf-bd33-e06fdf8a22fb::Deprecations/Upcoming deprecations/2025-08-20: Assistants API
Product
OpenAI API
Source
HTML
Change kind
Section Removed
Detected
Last updated

Deterministic evidence

Before / after

Extracted from OpenAI's published contract. Open the source ↗

−25+11 change

1 / 1
{
null
"blocks": [
{
"content": "On August 26th, 2025, we notified developers using the Assistants API of its deprecation and removal from the API one year later, on August 26, 2026.",
"type": "paragraph"
},
{
"content": "When we released the Responses API in March 2025, we announced plans to bring all Assistants API features to the easier to use Responses API, with a sunset date in 2026.",
"type": "paragraph"
},
{
"content": "See the Assistants to Conversations migration guide to learn more about how to migrate your current integration to the Responses API and Conversations API.",
"type": "paragraph"
},
{
"content": "Shutdown date\tModel / system\tRecommended replacement\n2026‑08‑26\tAssistants API\tResponses API and Conversations API",
"type": "table"
}
],
"path": [
"Deprecations",
"Upcoming deprecations",
"2025-08-20: Assistants API"
]
}

Interpreted documentation change

What the vendor announced

The evidence describes a deprecation timeline where the Assistants API is deprecated and removed one year after August 26, 2025, with a sunset date of 2026-08-26 and recommended replacements being the Responses API and Conversations API.

On August 26th, 2025, we notified developers using the Assistants API of its deprecation and removal from the API one year later, on August 26, 2026. When we released the Responses API in March 2025, we announced plans to bring all Assistants API features to the easier to use Responses API, with a sunset date in 2026. See the Assistants to Conversations migration guide to learn more about how to migrate your current integration to the Responses API and Conversations API. Shutdown date Model / system Recommended replacement 2026‑08‑26 Assistants API Responses API and Conversations API

Deadline Aug 26, 2026Vendor source ↗

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Multi-source correlation

Other OpenAI findings correlated with this change across sources.

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