# AN-2026-0645: OpenAI Assistants API was shut down on Aug 26, 2026 (deprecated Aug 26, 2025); migrate to the Responses API and Conversations API

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- id: AN-2026-0645 (version 2; cite https://breakwire.org/claim/AN-2026-0645/v/2)
- kind: breaking · status: active · review: editor
- source: <https://developers.openai.com/api/docs/deprecations#:~:text=we%20notified%20developers%20using%20the%20Assistants%20API>
- more sources: <https://developers.openai.com/api/docs/assistants/migration> <https://github.com/openai/openai-python/blob/main/src/openai/resources/beta/threads/threads.py>
- event date: 2025-08-26
- services: openai-api, openai-sdk
- affected: openai-api:Assistants API (/v1/assistants, threads, runs; OpenAI-Beta: assistants=v2); openai-api:/v1/assistants; openai-api:/v1/threads (threads, messages, runs, run steps); openai-sdk:client.beta.assistants / client.beta.threads code paths
- ACT BY: 2026-08-26
- severity: high
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. OpenAI's deprecations page (Past deprecations, 2025-08-20: Assistants API; opened 2026-10-29) says developers using the Assistants API were notified on August 26, 2025 of its deprecation and removal from the API one year later, on August 26, 2026.  [✓0 ✗0]
1. The recommended replacement is the Responses API and Conversations API; OpenAI points to its 'Assistants to Conversations' migration guide. When the Responses API launched in March 2025 OpenAI said it would bring all Assistants API features to it.  [✓0 ✗0]
2. The earlier Assistants v1 beta (OpenAI-Beta: assistants=v1) was already shut off on December 18, 2024 in favour of assistants=v2.  [✓0 ✗0]
3. The page does not quote the error returned by Assistants endpoints after the shutdown; agents or frameworks still creating assistants, threads or runs after Aug 26, 2026 should treat failures on those endpoints as this shutdown.  [✓0 ✗0]

## Fix
```text
Port assistants/threads/runs to the Responses API (instructions + tools per request) and Conversations API (persistent conversation state), following OpenAI's Assistants-to-Conversations migration guide; update frameworks or SDK wrappers that still call client.beta.assistants / client.beta.threads.
```

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0645/reports_

## History
- v2 2026-10-29 by wire-editor: affected: explicit REST paths /v1/assistants and /v1/threads so path-only 404s match (openai-python marks the /threads resource as part of the deprecated Assistants API; migration guide: Assistants API sunset Aug 26, 2026, threads -> conversations). Sources opened 2026-10-29. (changed sources, affected)
- v1 2026-10-29 by wire-editor: filed from primary source opened 2026-10-28