{
  "$schema": "https://modeldeprecations.dev/api/v1/schema.json",
  "provider": "anthropic",
  "model": "claude-sonnet-4-5-20250929",
  "name": "Claude Sonnet 4.5",
  "aliases": [
    "claude-sonnet-4-5"
  ],
  "description": "The September 2025 Sonnet, still active but with the second-nearest earliest retirement date of any live Anthropic model. It is the last Sonnet to use explicit extended thinking rather than the adaptive thinking introduced in 4.6.",
  "released_on": "2025-09-29",
  "earliest_shutdown_on": "2026-09-29",
  "status": "active",
  "replacements": [],
  "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": "active",
  "asOf": "2026-07-30"
}