{
  "description": "規劃估算，非實際帳單。API等值與Codex訂閱分開；價格核查2026-09-13。",
  "date": "2026-09-13",
  "currency": "USD",
  "planning_usd_to_twd": 32,
  "token_budget_millions": true,
  "model_weights": {
    "astra": 0.2,
    "sol": 0.2,
    "terra": 0.5,
    "luna": 0.1
  },
  "api_prices_per_million": {
    "astra": {
      "input": 10,
      "cached_input": 1,
      "output": 50
    },
    "sol": {
      "input": 4,
      "cached_input": 0.4,
      "output": 20
    },
    "terra": {
      "input": 2,
      "cached_input": 0.2,
      "output": 12
    },
    "luna": {
      "input": 0.2,
      "cached_input": 0.02,
      "output": 1.2
    }
  },
  "uncached_input_budget_multiplier": 1.25,
  "contingency_multiplier": 1.3,
  "cache_hit_scenarios": [
    0.7,
    0
  ],
  "weighted_prices": {
    "input": 3.82,
    "cached_input": 0.382,
    "output": 20.12,
    "input_with_budget_multiplier": 4.775
  },
  "scenarios": [
    {
      "name": "精簡",
      "input_million": 20,
      "output_million": 2,
      "api_budget_usd_70pct_cache": 96.5094,
      "api_budget_usd_no_cache": 176.462,
      "twd_budget_low": 3089,
      "twd_budget_high": 5647,
      "codex_credits_with_30pct_reserve_low": 2227,
      "codex_credits_with_30pct_reserve_high": 3791
    },
    {
      "name": "標準",
      "input_million": 60,
      "output_million": 6,
      "api_budget_usd_70pct_cache": 289.5282,
      "api_budget_usd_no_cache": 529.3859999999999,
      "twd_budget_low": 9265,
      "twd_budget_high": 16941,
      "codex_credits_with_30pct_reserve_low": 6680,
      "codex_credits_with_30pct_reserve_high": 11373
    },
    {
      "name": "反覆修正",
      "input_million": 150,
      "output_million": 15,
      "api_budget_usd_70pct_cache": 723.8205,
      "api_budget_usd_no_cache": 1323.465,
      "twd_budget_low": 23163,
      "twd_budget_high": 42351,
      "codex_credits_with_30pct_reserve_low": 16699,
      "codex_credits_with_30pct_reserve_high": 28431
    }
  ],
  "codex_credits_note": "credits依官方費率計算，不套用API的25%寫入預留；未扣除訂閱內含額度，現金價格須看帳號。",
  "time": {
    "phase_min_days": [
      2,
      3,
      3,
      2,
      3,
      4,
      3
    ],
    "phase_max_days": [
      3,
      5,
      5,
      4,
      5,
      7,
      5
    ],
    "contingency": 1.25,
    "total_workdays_min": 25,
    "total_workdays_max": 43
  },
  "excluded": "稅金、訂閱、額外工具、超長上下文/Fast加價、硬體、主機、人工；P0後依實際usage校準"
}