{
  "schema_version": 1,
  "experiment_id": "20260827T231837Z",
  "validated_at": "2026-08-27T23:50:26.030Z",
  "status": "complete_with_model_identity_deviation",
  "checks": [
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        "declared": "062483c120974664a990429456276cb67ff03eabb61feb9f71abfae135b45a33"
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      "name": "neutral fixture remains clean at frozen commit",
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      "name": "byte-identical contestant prompt",
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      "detail": null
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    {
      "name": "clean equivalent starting workspaces",
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      "observed": {
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        "codex": 1,
        "exit_codes": [
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      "detail": null
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    {
      "name": "requested Claude Opus 5 identity matched runtime",
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      "observed": {
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        "configured": "opus",
        "confirmed_runtime_models": [
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          "claude-opus-4-7"
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      },
      "detail": "The CLI opus alias executed claude-opus-4-7; the run is publishable only with this deviation disclosed."
    },
    {
      "name": "Codex model configuration preserved without runtime invention",
      "passed": true,
      "observed": {
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        "runtime": null
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      "detail": null
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    {
      "name": "same final grader checks ran against both",
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          "desktop_recorded_screenshots_load",
          "desktop_screenshot_captured",
          "mobile_experiment_question_visible",
          "mobile_global_identity",
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          "mobile_page_loads",
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          "mobile_screenshot_captured",
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            "stderr": "server.stderr.log"
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      },
      "detail": null
    },
    {
      "name": "desktop and mobile browser checks passed",
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      "observed": {
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          "failed": [],
          "total": 17
        },
        "codex": {
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      },
      "detail": null
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    {
      "name": "non-empty fixed-viewport screenshots captured",
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      "observed": {
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      },
      "detail": null
    },
    {
      "name": "complete source and diff evidence captured",
      "passed": true,
      "observed": {
        "claude": {
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          "source_files": 57,
          "status": "M app/globals.css\n M app/layout.tsx\n M app/page.tsx"
        },
        "codex": {
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          "source_files": 57,
          "status": "M app/globals.css\n M app/layout.tsx\n M app/page.tsx"
        }
      },
      "detail": null
    },
    {
      "name": "contestants did not receive opposing workspace output",
      "passed": true,
      "observed": {
        "claude_transcript_contains_codex_workspace": false,
        "codex_transcript_contains_claude_workspace": false
      },
      "detail": null
    },
    {
      "name": "infrastructure failures preserved separately",
      "passed": true,
      "observed": [
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        "infrastructure-failures/claude-not-authenticated/failure.json",
        "infrastructure-failures/codex-grader-lazy-image-hang/failure.json",
        "infrastructure-failures/codex-grader-question-heuristic/failure.json"
      ],
      "detail": null
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    {
      "name": "results package preserves null runtime identity and evidence references",
      "passed": true,
      "observed": {
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        "codex_runtime_model": null,
        "codex_cost_usd": null
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      "detail": null
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  "summary": {
    "passed": 14,
    "failed": [
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    "total": 15
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}