{
  "$schema": "https://modeldeprecations.dev/api/v1/schema.json",
  "provider": "openai",
  "model": "o1",
  "name": "o1",
  "aliases": [
    "o1-2024-12-17"
  ],
  "description": "The first generally available reasoning model, and the release that proved spending inference compute could substitute for a larger model. It introduced the constraints the whole o-series inherited: no system messages at launch, no streaming, and max_completion_tokens in place of max_tokens.",
  "released_on": "2024-12-17",
  "deprecated_on": "2026-04-22",
  "shutdown_on": "2026-10-23",
  "status": "deprecated",
  "replacements": [
    {
      "provider": "openai",
      "model": "gpt-5.6-sol",
      "recommended": true,
      "note": "Sol lifts most of o1's restrictions — system messages, streaming and tool calls all work — so code written defensively around o1 can usually be simplified rather than ported.",
      "external": false
    }
  ],
  "sources": [
    {
      "url": "https://developers.openai.com/api/docs/deprecations",
      "title": "OpenAI API deprecations",
      "accessed": "2026-07-30"
    }
  ],
  "last_verified": "2026-07-30",
  "computed_status": "deprecated",
  "asOf": "2026-07-30"
}