{
  "sourcePage": "https://www.anthropic.com/claude/mythos",
  "verifiedAt": "2026-11-03T13:33:15Z",
  "methodUrl": "/news/claude-release-cadence/mythos-html-comparison.json",
  "snapshots": [
    {
      "capturedAt": "2026-10-31T21:49:26Z",
      "archiveUrl": "https://web.archive.org/web/20261031214926/https://www.anthropic.com/claude/mythos",
      "rawUrl": "https://web.archive.org/web/20261031214926id_/https://www.anthropic.com/claude/mythos",
      "label": "Claude Claude Mythos 5.5",
      "mythos55Occurrences": 6,
      "bytes": 158175,
      "sha256": "e5d08cfb0a00c9696bf54d39eee32c2623f5627e8298c4554901bde1e5e737a5"
    },
    {
      "capturedAt": "2026-11-01T20:05:45Z",
      "archiveUrl": "https://web.archive.org/web/20261101200545/https://www.anthropic.com/claude/mythos",
      "rawUrl": "https://web.archive.org/web/20261101200545id_/https://www.anthropic.com/claude/mythos",
      "label": "Claude Mythos 5.1",
      "mythos55Occurrences": 0,
      "bytes": 158133,
      "sha256": "4608c9146aa640cfc67470492a46757e66bf3fe85872f715914178bb6bfc318d"
    }
  ],
  "comparison": {
    "operation": "Replace the exact UTF-8 label in the October 31 raw HTML; compare the resulting bytes with the November 1 raw HTML.",
    "fromLabel": "Claude Claude Mythos 5.5",
    "toLabel": "Claude Mythos 5.1",
    "replacements": 6,
    "identicalAfterReplacement": true,
    "fields": [
      "hidden h1",
      "desktop logo alt",
      "mobile logo alt"
    ],
    "duplicates": "The three field values also occur in serialized page initialization data.",
    "scope": "These two archived raw HTML responses only. Capture times do not establish the exact site-change time."
  }
}