{
  "$schema_version": 1,
  "latest_bundle_date": "2026-05-31",
  "min_supported_date": "2026-04-01",
  "providers_changed_since": [
    "anthropic/claude-opus-4-8",
    "openai/gpt-5.5",
    "openai/gpt-5.4",
    "openai/gpt-5.4-mini",
    "xai/grok-4.3",
    "xai/grok-4.20",
    "google/gemini-3.5-flash",
    "google/gemini-2.5-flash"
  ],
  "notes": "Layer 3 of the Halton Meter pricing-freshness model. Fetched by `halton-meter doctor` at https://haltonmeter.com/rates-manifest.json with a 2-second timeout and fail-open semantics. Cost computation never touches the network; this manifest is purely a freshness signal. Bump latest_bundle_date in lockstep with the BUNDLED_RATES_DATE constant in daemon/halton_meter/pricing/matrix.py whenever the bundled rates change. providers_changed_since is a free-form list of provider/model identifiers an operator running an older daemon should know are stale."
}