{
  "source": "System1 version 1 launch contract and prelaunch public-input stress report",
  "measured": "2026-09-27",
  "status": "candidate_pending_exact_image_and_production_path_validation",
  "request_bounds": {
    "questions_per_request": 1,
    "serialized_state_max_bytes": 16384,
    "request_body_max_bytes": 6291456,
    "selected_model_input_max_tokens": 4096,
    "tokenizer": "actual tokenizer for the selected model"
  },
  "choice_option_bounds": {
    "s1-fast": {
      "min": 2,
      "max": 16
    },
    "s1-pro": {
      "min": 2,
      "max": 64
    }
  },
  "image_bounds": {
    "images_per_request_max": 1,
    "decoded_image_max_bytes": 4194304,
    "decoded_pixels_max": 2000000,
    "image_model": "s1-pro candidate only; availability remains gated"
  },
  "prelaunch_stress_observations": {
    "s1-fast_text_largest_input_tokens": 4033,
    "s1-pro_text_largest_input_tokens": 4043,
    "s1-pro_image_largest_input_tokens": 810,
    "source": "Prelaunch rotating public-input stress report; exact-image production-path proof is still pending."
  },
  "metering": {
    "basis": "actual per-request model input-token count, including supported image tokens",
    "image_surcharge": "none in the candidate method; image support remains gated on tariff, per-item count validation and independent pricing review",
    "money_unit": "integer nanos; 1 currency unit = 1000000000 nanos",
    "charge_formula": "input_tokens × integer_rate_nanos; no per-request rounding",
    "live_tariff_published": false
  },
  "availability": "This source summary does not establish live enforcement, production availability, or end-to-end latency."
}