{
  "$schema": "https://modeldeprecations.dev/api/v1/schema.json",
  "provider": "xai",
  "model": "grok-4-1-fast-reasoning",
  "name": "Grok 4.1 Fast Reasoning",
  "aliases": [],
  "description": "A 2M-context reasoning model that was, for a few months, the cheapest way to put a long document in front of a frontier model. It retired on 15 May 2026, and the slug still resolves - requests are silently served by grok-4.3 at grok-4.3 prices, which is the trap in this whole retirement wave.",
  "shutdown_on": "2026-05-15",
  "status": "retired",
  "replacements": [
    {
      "provider": "xai",
      "model": "grok-4.3",
      "recommended": true,
      "note": "xAI maps this id to grok-4.3 with reasoning effort \"low\". The slug keeps working, so nothing breaks - but you are billed $1.25/$2.50 per million instead of the old rate, and the context window drops from 2M to 1M.",
      "external": false
    }
  ],
  "sources": [
    {
      "url": "https://docs.x.ai/developers/migration/may-15-retirement",
      "title": "Grok Model Retirement on May 15, 2026",
      "accessed": "2026-08-03"
    }
  ],
  "last_verified": "2026-08-03",
  "computed_status": "retired",
  "asOf": "2026-08-03"
}