{
  "ledger": {
    "cost_accounting": {
      "currency": "USD",
      "rate_card_equivalent": {
        "amount": null,
        "rate_card_source": null,
        "reason": "No local model-cost sheet, exact billable model evidence or applicable task-surface rate card was available; no hypothetical per-token price is applied.",
        "status": "unavailable"
      },
      "separately_billed_openai_api": {
        "amount": 0.0,
        "basis": "No user-keyed OpenAI API call was made by this workflow; subscription/task-surface usage is accounted for separately as unavailable or measured tokens.",
        "scope": "User-keyed, separately billed OpenAI API calls made by the release-authoring workflow represented by this ledger.",
        "status": "measured-for-declared-scope"
      },
      "subscription_fee_allocation": {
        "amount": null,
        "reason": "No defensible method or platform evidence allocates a subscription fee to this task.",
        "status": "unavailable"
      }
    },
    "measurement_scope": {
      "coverage": "partial-v0.1.0-goal-reading-plus-unavailable-v0.2.0-correction-and-v0.3.0-semantic-migration-usage",
      "description": "AI-assisted research, authoring, correction, review and candidate-assurance work performed in the Codex subscription task surface through the v0.3.0 semantic-model candidate.",
      "id": "RELEASE-AUTHORING-TASK-2026-07-29",
      "measurement_cutoff_at": "2026-08-10T13:22:01Z",
      "pre_tracking_usage": {
        "input_tokens": null,
        "output_tokens": null,
        "reason": "Goal-level token tracking began after release authoring was already under way; the platform supplied no evidence from which to reconstruct earlier usage.",
        "status": "unavailable",
        "total_tokens": null
      },
      "tracking_started_at": "2026-07-29T11:41:33Z"
    },
    "methodology": {
      "candidate_freeze_record": "The available v0.1.0 goal-level total is retained. No active goal-level usage report was exposed for the v0.2.0 correction or v0.3.0 semantic migration, and the platform did not expose a trustworthy input/output split, pre-tracking total or task-level subscription allocation, so those fields remain null.",
      "human_audit": "not_performed",
      "retrospective_estimation": false,
      "subscription_is_api_spend": false,
      "zero_api_spend_means_zero_total_cost": false
    },
    "model_sessions": [
      {
        "id": "CODEX-SUBSCRIPTION-TASK",
        "measured_input_tokens": null,
        "measured_output_tokens": null,
        "measured_total_tokens": 213364,
        "measurement_source": "Codex goal tracker reading at candidate freeze, 2026-07-29T12:04:29Z",
        "measurement_status": "partially-measured",
        "model": null,
        "model_identification_status": "exact-model-identifier-not-supplied-as-billing-evidence",
        "notes": "A measured total may be recorded even when the platform does not expose a trustworthy input/output split. Subagents and automatic continuation are included only to the extent represented by the goal tracker.",
        "surface": "Codex subscription task surface"
      },
      {
        "id": "CODEX-SUBSCRIPTION-CORRECTION-2026-07-29",
        "measured_input_tokens": null,
        "measured_output_tokens": null,
        "measured_total_tokens": null,
        "measurement_source": "No active goal-level usage report was exposed for the v0.2.0 correction task at candidate freeze.",
        "measurement_status": "unavailable",
        "model": null,
        "model_identification_status": "exact-model-identifier-not-supplied-as-billing-evidence",
        "notes": "The correction used the subscription task surface and subagents, but the platform supplied no trustworthy task-level token total or input/output split; null is not zero.",
        "surface": "Codex subscription task surface"
      },
      {
        "id": "CODEX-SUBSCRIPTION-SEMANTIC-MIGRATION-2026-08-10",
        "measured_input_tokens": null,
        "measured_output_tokens": null,
        "measured_total_tokens": null,
        "measurement_source": "No trustworthy task-level token or billing export was exposed for the v0.3.0 semantic-model migration at candidate assembly.",
        "measurement_status": "unavailable",
        "model": null,
        "model_identification_status": "exact-model-identifier-not-supplied-as-billing-evidence",
        "notes": "The migration used the subscription task surface and subagents. Null records unavailable measurement and must not be read as zero.",
        "surface": "Codex subscription task surface"
      }
    ],
    "notes": [
      "This is disclosure evidence for an AI-generated proof of concept, not a billing statement.",
      "Null means unavailable or not yet measured, never zero.",
      "The USD 0.00 value is limited to separately billed, user-keyed OpenAI API calls and does not value the subscription, staff time, tool traffic or infrastructure."
    ],
    "release_version": "0.3.0",
    "schema": "okf-hmlr-ai-model-usage.v1"
  },
  "schema": "okf-hmlr-ai-usage-projection.v1",
  "source": {
    "path": "governance/ai-model-usage.json",
    "sha256": "ad0598ec99ea825a140e05dbe2678ecea509313a3ddca36db62aea6f27b88e05"
  }
}