{
  "$schema": "https://modeldeprecations.dev/api/v1/schema.json",
  "provider": "anthropic",
  "model": "claude-2.1",
  "name": "Claude 2.1",
  "aliases": [],
  "description": "The model that took Claude to a 200k context window in late 2023, when the rest of the field was at 8k to 32k. Long context was Anthropic's clearest differentiator for most of a year. Retired July 2025.",
  "released_on": "2023-11-21",
  "deprecated_on": "2025-01-21",
  "shutdown_on": "2025-07-21",
  "status": "retired",
  "replacements": [
    {
      "provider": "anthropic",
      "model": "claude-opus-4-8",
      "recommended": true,
      "note": "Claude 2.1 predates the Messages API. Migrating means moving off the legacy completions endpoint and its Human/Assistant 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"
}