{
  "schema_version": "1.7.0",
  "id": "x_SHAPI-openai-assistants-threads-api-shutdown",
  "modified": "2026-10-31T01:21:48Z",
  "published": "2025-08-26T00:00:00Z",
  "summary": "Assistants API threads, messages and runs removed on 2026-08-26",
  "details": "OpenAI removed the Assistants API on 2026-08-26, one year after its 2025-08-26 deprecation notice, including the threads, messages and runs endpoints that go with it (/v1/threads/**). Calls to them no longer work. The replacement is the Responses API plus the Conversations API. The assistants endpoints themselves are covered by openai-assistants-api-shutdown.\n\nMove assistants to prompts (configuration created in the dashboard), threads to Conversations, and runs to Responses (send input items or a conversation id to the Responses API), and run the tool-call loop in your own code. Thread messages can no longer be fetched from the API, so read history from your own stored copy.",
  "affected": [
    {
      "ecosystem_specific": {
        "provider": "openai",
        "endpoint": {
          "method": "*",
          "path": "/v1/threads/**"
        },
        "change_class": "version-sunset",
        "trigger": {
          "any": true
        },
        "effective_date": "2026-08-26"
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://developers.openai.com/api/docs/deprecations"
    },
    {
      "type": "WEB",
      "url": "https://developers.openai.com/api/docs/assistants/migration"
    }
  ],
  "database_specific": {
    "severity": "critical",
    "status": "verified",
    "url": "https://shapi.dev/osv/openai-assistants-threads-api-shutdown.json"
  }
}