{
 "claim": "The decision model is not where the money goes. Across the 147 WebMCP attempts, Jev costs $0.045 and Mercury costs $0.156 - the argument writer is 77.6% of the bill. Under the DOM setup the split inverts to 75.7% Jev, because page control mostly means picking an element and only a quarter of steps need any text written at all.",
 "method": "Summed provider_usage.{jev,mercury}.{calls,cost,usage} over every record in results/2026-09-18-jev-mercury/webmcp-traces.jsonl.gz and dom-traces.jsonl.gz (147 attempts each). 'per step' divides calls by the total number of agent steps in the same transcripts. The 'both' cost rows reproduce PROVENANCE.md's scored-attempt totals of $0.201557376 and $0.245387386 exactly.",
 "source": "https://github.com/nekuda-ai/WindTunnel/blob/main/results/2026-09-18-jev-mercury/PROVENANCE.md",
 "captured": "2026-09-19",
 "note": "Jev is billed at $0.042 per million tokens of every kind, with output free, so its effective rate barely moves. Mercury is $0.20 input / $0.02 cached / $0.75 output. Neither rate includes the 5x Mercury promotional discount that the run recorded as promotional_est_cost_usd and left unapplied.",
 "columns": [
  {
   "key": "setup",
   "label": "setup"
  },
  {
   "key": "model",
   "label": "model"
  },
  {
   "key": "role",
   "label": "role"
  },
  {
   "key": "calls",
   "label": "calls",
   "align": "right"
  },
  {
   "key": "perstep",
   "label": "/ step",
   "align": "right"
  },
  {
   "key": "tokens",
   "label": "tokens",
   "align": "right"
  },
  {
   "key": "cost",
   "label": "cost",
   "align": "right"
  },
  {
   "key": "share",
   "label": "share",
   "align": "right"
  },
  {
   "key": "rate",
   "label": "$/Mtok",
   "align": "right"
  }
 ],
 "rows": [
  {
   "setup": "WebMCP",
   "model": "Jev 1.13.0",
   "role": "picks the action",
   "calls": "413",
   "perstep": "1.00",
   "tokens": "1,104,774",
   "cost": "$0.045111",
   "share": "22.4%",
   "rate": "$0.041"
  },
  {
   "setup": "WebMCP",
   "model": "Mercury 2.5",
   "role": "writes the arguments",
   "calls": "385",
   "perstep": "0.93",
   "tokens": "737,101",
   "cost": "$0.156447",
   "share": "77.6%",
   "rate": "$0.212"
  },
  {
   "setup": "WebMCP",
   "model": "both",
   "role": "",
   "calls": "798",
   "perstep": "1.93",
   "tokens": "1,841,875",
   "cost": "$0.201557",
   "share": "100.0%",
   "rate": "$0.109"
  },
  {
   "setup": "DOM (ultrafast)",
   "model": "Jev 1.13.0",
   "role": "picks the action",
   "calls": "1,097",
   "perstep": "1.00",
   "tokens": "4,721,064",
   "cost": "$0.185858",
   "share": "75.7%",
   "rate": "$0.039"
  },
  {
   "setup": "DOM (ultrafast)",
   "model": "Mercury 2.5",
   "role": "writes the arguments",
   "calls": "278",
   "perstep": "0.25",
   "tokens": "229,003",
   "cost": "$0.059530",
   "share": "24.3%",
   "rate": "$0.260"
  },
  {
   "setup": "DOM (ultrafast)",
   "model": "both",
   "role": "",
   "calls": "1,375",
   "perstep": "1.25",
   "tokens": "4,950,067",
   "cost": "$0.245387",
   "share": "100.0%",
   "rate": "$0.050"
  }
 ]
}