{
  "$schema": "https://modeldeprecations.dev/api/v1/schema.json",
  "provider": "anthropic",
  "model": "claude-1.0",
  "name": "Claude 1.0",
  "aliases": [],
  "description": "The first Claude released to developers, in March 2023, and the model that introduced Constitutional AI to a public API. It used the text-completion endpoint with literal \"Human:\" and \"Assistant:\" turn markers rather than a structured message list — a shape that reads as archaeology now.",
  "deprecated_on": "2024-09-04",
  "shutdown_on": "2024-11-06",
  "status": "retired",
  "replacements": [
    {
      "provider": "anthropic",
      "model": "claude-haiku-4-5-20251001",
      "recommended": true,
      "note": "Two generations and a whole API separate these. Claude 1 predates the Messages API, so a migration means moving off /v1/complete and its \"\\n\\nHuman:\"/\"\\n\\nAssistant:\" prompt format entirely.",
      "external": false
    }
  ],
  "sources": [
    {
      "url": "https://platform.claude.com/docs/en/about-claude/model-deprecations",
      "title": "Anthropic model deprecations",
      "accessed": "2026-07-30"
    }
  ],
  "last_verified": "2026-07-30",
  "computed_status": "retired",
  "asOf": "2026-07-30"
}