Model and API retirements

Within 30 days64Firm dates ahead558

64 within 30 days · 558 firm dates ahead

Assistants API retirement date and replacement

OpenAI API · API · retired Aug 26, 2026 (retired)

Vendor page

Dates

Checked Nov 9, 2026 on OpenAI's page
RetiredAug 26, 2026 (retired)
AnnouncedAug 20, 2025
ReplacementResponses API and Conversations API
What it isAssistants API was switched off on OpenAI API.
Sourcedevelopers.openai.com/api/docs/deprecations

Around the same time on OpenAI API

OpenAI
OpenAI APIModel

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OpenAI APIModel

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retiredJul 23
OpenAI APIModel

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Shut down on OpenAI API.

retiredJul 23
OpenAI APIModel

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OpenAI APIModel

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OpenAI APIModel

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Shut down on OpenAI API.

retiredJul 23
OpenAI APIModel

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Shut down on OpenAI API.

retiredJul 23
OpenAI APIModel

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Shut down on OpenAI API.

retiredJul 23
OpenAI APIModel

gpt-5.1-codex-mini

Shut down on OpenAI API.

retiredJul 23
OpenAI APIModel

gpt-5.2-codex

Shut down on OpenAI API.

retiredJul 23
OpenAI APIModel

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Shut down on OpenAI API.

retiredJul 23
OpenAI APIModel

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Shut down on OpenAI API.

retiredJul 23