{
  "measured_on": "2026-10-13",
  "gpt_encodings_measured": [
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    "o200k_base"
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  "gemini_models_requested": [
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    "gemini-3.6-flash",
    "gemini-3.5-flash-lite",
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  "gemini_models_measured": [
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    "gemini-3.6-flash",
    "gemini-3.5-flash-lite",
    "gemini-3.1-flash-lite"
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  "gemini_model_status": {
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      "requested_model_id": "gemini-3.1-pro-preview",
      "status": "ok",
      "baseline_tokens_empty_string": 1
    },
    "gemini-3.6-flash": {
      "requested_model_id": "gemini-3.6-flash",
      "status": "ok",
      "baseline_tokens_empty_string": 1
    },
    "gemini-3.5-flash-lite": {
      "requested_model_id": "gemini-3.5-flash-lite",
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      "baseline_tokens_empty_string": 1
    },
    "gemini-3.1-flash-lite": {
      "requested_model_id": "gemini-3.1-flash-lite",
      "status": "ok",
      "baseline_tokens_empty_string": 1
    }
  },
  "gemini_response_model_id_note": "countTokens returns only total_tokens; the response carries no model id, so the requested id is the only id recorded.",
  "claude_measured": false,
  "categories": {
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    {
      "id": "gemini/gemini-3.1-pro-preview",
      "name": "Gemini 3.1 Pro (preview)",
      "vendor": "Google",
      "in_per_million_tokens": 2.0,
      "basis": "gemini-3.1-pro-preview (measured on this model id)",
      "usd_per_million_chars": {
        "english_prose": 0.3864,
        "chinese_traditional": 1.2905,
        "chinese_simplified": 1.2067,
        "python_code": 0.6512,
        "json": 0.903
      }
    },
    {
      "id": "gemini/gemini-3.6-flash",
      "name": "Gemini 3.6 Flash",
      "vendor": "Google",
      "in_per_million_tokens": 0.75,
      "basis": "gemini-3.6-flash (measured on this model id)",
      "usd_per_million_chars": {
        "english_prose": 0.1449,
        "chinese_traditional": 0.4839,
        "chinese_simplified": 0.4525,
        "python_code": 0.2442,
        "json": 0.3386
      }
    },
    {
      "id": "gemini/gemini-3.5-flash-lite",
      "name": "Gemini 3.5 Flash-Lite",
      "vendor": "Google",
      "in_per_million_tokens": 0.3,
      "basis": "gemini-3.5-flash-lite (measured on this model id)",
      "usd_per_million_chars": {
        "english_prose": 0.058,
        "chinese_traditional": 0.1936,
        "chinese_simplified": 0.181,
        "python_code": 0.0977,
        "json": 0.1355
      }
    },
    {
      "id": "gemini/gemini-3.1-flash-lite",
      "name": "Gemini 3.1 Flash-Lite",
      "vendor": "Google",
      "in_per_million_tokens": 0.25,
      "basis": "gemini-3.1-flash-lite (measured on this model id)",
      "usd_per_million_chars": {
        "english_prose": 0.0483,
        "chinese_traditional": 0.1613,
        "chinese_simplified": 0.1508,
        "python_code": 0.0814,
        "json": 0.1129
      }
    }
  ],
  "same_input_rate_pairs": [
    {
      "gemini": "Gemini 3.1 Pro (preview)",
      "gpt": "GPT-5.6 Terra",
      "shared_in_per_million_tokens": 2.0,
      "gemini_cost_over_gpt_cost": {
        "english_prose": 1.009,
        "chinese_traditional": 0.762,
        "chinese_simplified": 0.845,
        "python_code": 1.226,
        "json": 1.16
      }
    },
    {
      "gemini": "Gemini 3.6 Flash",
      "gpt": "GPT-5.4 mini",
      "shared_in_per_million_tokens": 0.75,
      "gemini_cost_over_gpt_cost": {
        "english_prose": 1.009,
        "chinese_traditional": 0.762,
        "chinese_simplified": 0.845,
        "python_code": 1.226,
        "json": 1.16
      }
    }
  ]
}