{
  "$schema": "https://modeldeprecations.dev/api/v1/schema.json",
  "provider": "anthropic",
  "model": "claude-mythos-preview",
  "name": "Claude Mythos Preview",
  "aliases": [],
  "description": "The first Mythos-class model, released in April 2026 to a closed group of cyber defenders and critical infrastructure providers under Project Glasswing. It is the only deprecated Claude model with no retirement date on the deprecations page - the notice lives in a callout on the models overview instead, because an invitation-only model has no public user base to give sixty days' notice to.",
  "status": "deprecated",
  "replacements": [
    {
      "provider": "anthropic",
      "model": "claude-mythos-5",
      "recommended": true,
      "note": "Same access model: invitation-only through Project Glasswing, no self-serve sign-up. Mythos 5 is priced at less than half of Mythos Preview.",
      "external": false
    }
  ],
  "sources": [
    {
      "url": "https://platform.claude.com/docs/en/about-claude/model-deprecations",
      "title": "Anthropic model deprecations",
      "accessed": "2026-08-03"
    },
    {
      "url": "https://platform.claude.com/docs/en/about-claude/models/overview",
      "title": "Anthropic models overview",
      "accessed": "2026-08-03"
    }
  ],
  "last_verified": "2026-08-03",
  "computed_status": "deprecated",
  "asOf": "2026-08-03"
}