{
  "$schema": "https://modeldeprecations.dev/api/v1/schema.json",
  "provider": "deepseek",
  "model": "deepseek-reasoner",
  "name": "DeepSeek Reasoner",
  "aliases": [],
  "description": "The id that served DeepSeek-R1 in January 2025, the open-weights reasoning model that made chain-of-thought cheap and briefly moved the US stock market. It was the first mainstream API to hand back the reasoning trace itself in `reasoning_content`. From V3.1 onwards it stopped being a separate model and became the thinking half of a hybrid one, which is why V4 replaced it with a request parameter rather than another id.",
  "released_on": "2025-01-20",
  "deprecated_on": "2026-04-24",
  "shutdown_on": "2026-07-24",
  "status": "retired",
  "replacements": [
    {
      "provider": "deepseek",
      "model": "deepseek-v4-flash",
      "recommended": true,
      "note": "deepseek-reasoner routed to V4-Flash with thinking on, which is the default, so `model: \"deepseek-v4-flash\"` reproduces the old behaviour. Use `thinking.reasoning_effort` (`low`, `high`, `max`) to trade depth against cost, and deepseek-v4-pro for the hardest problems.",
      "external": false
    }
  ],
  "sources": [
    {
      "url": "https://api-docs.deepseek.com/news/news250120/",
      "title": "DeepSeek-R1 Release",
      "accessed": "2026-08-03"
    },
    {
      "url": "https://api-docs.deepseek.com/news/news260424/",
      "title": "DeepSeek V4 Preview Release",
      "accessed": "2026-08-03"
    },
    {
      "url": "https://api-docs.deepseek.com/updates/",
      "title": "DeepSeek API change log",
      "accessed": "2026-08-03"
    }
  ],
  "last_verified": "2026-08-03",
  "computed_status": "retired",
  "asOf": "2026-08-03"
}