{
 "analysis_method": "Every valid measured pair, no outlier dropped. % = mean(Context Mode - plain) / mean(plain), with the 95% t interval. Verdict: \"less\" when the whole interval is below zero, \"more\" when above, else \"same\". Gateway wins: pairs where Context Mode cost less.",
 "arms": {"gateway": "Claude Code talks to Anthropic through Context Mode.", "plain": "Claude Code talks to Anthropic direct."},
 "client": "Claude Code 2.1.283",
 "cost_basis": "Cost in US dollars at API list price, both arms: list price applied to the token counts Anthropic returned for each call. The runs used a claude.ai login, which has no per-token invoice. Plain: Claude Code's own total. Context Mode: the gateway's per-call record for the run's sessions, hidden calls included, each call at the list price of the model it ran on, checked per run against Claude Code's own figure.",
 "coverage": {"arms": 176, "arms_recomputed": 88, "arms_with_client_figure": 176, "calls_known_total": 527, "calls_with_tokens": 176},
 "date": "2026-09-29",
 "deployed_commits": ["6e2b65d565aa68f3eacdcece77fe72721c18573f","a809caf0741cbd4426f0ca49b10b692018c0b03c","ddfaf557d3e79a4d97ecbc4708d2e09cd09e468a"],
 "gateway_commit": "408333a48d082830f5813b3f539ec03993830a89",
 "harness": "start-cost-ab",
 "legend": {"col.cr": "cache read tokens", "col.cw1h": "cache write tokens, 1 hour lifetime", "col.cw5": "cache write tokens, 5 minute lifetime", "col.cwx": "cache write tokens whose lifetime was not saved: usd_recomputed prices them at the 1 hour rate (Claude Code's main thread), usd_recomputed_low at the 5 minute rate", "col.in": "input tokens not read from or written to the cache", "col.missing": "a token column left out of a block is all zeros; model indexes into models", "col.out": "output tokens; null = not saved per call", "from.client_first_call": "Claude Code's stream: the first call's input-side usage only", "from.ledger_first_row": "the gateway ledger: the first row of the session only", "rest.after_first_call": "the gateway ledger's session totals minus the first row", "why.first_call_only": "Only the first call's input-side tokens were saved for this arm. The run folders with the other calls were deleted after the run."},
 "model": "claude-opus-5-5",
 "prices": {
  "aliases": {"claude-haiku-4-5-20251001": "claude-haiku-4-5"},
  "as_of": "2026-09-29",
  "models": {
   "claude-haiku-4-5": {"cr": 0.1, "cw1h": 2, "cw5": 1.25, "in": 1, "out": 5},
   "claude-opus-5-5": {"cr": 0.2, "cw1h": 8, "cw5": 5, "in": 4, "out": 20}
  },
  "source_url": "https://www.anthropic.com/pricing",
  "unit": "USD per million tokens"
 },
 "schema": "context-mode.benchmark-evidence/2",
 "source_file": "v3-opus55-short.json",
 "warmup_pairs": 1,
 "workloads": [
  {
   "analysis": {"gateway_usd_mean": 0.06832, "gateway_wins": 15, "n": 16, "pct": -21.8, "pct_ci95": [-27.7,-15.8], "plain_usd_mean": 0.08731, "success_gateway": "16/16", "success_plain": "16/16", "verdict": "less"},
   "id": "tests",
   "invalid_attempts": 2,
   "label": "npm test fix loop, short",
   "pairs": [
    {
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      "calls_from": "ledger_first_row",
      "coverage": {"calls": 1, "of": 3, "sum_complete": true},
      "rest": {"cr": [32235], "cwx": [3126], "in": [6], "model": [0], "models": ["claude-opus-5-5"], "n": [2], "out": [279], "what": ["after_first_call"]},
      "success": true,
      "turns": 3,
      "usd": 0.066238,
      "usd_client": 0.0662378,
      "usd_recomputed": 0.066238,
      "usd_recomputed_low": 0.05686
     },
     "pair": 1,
     "plain": {
      "calls": {"cr": [10118], "cw1h": [5563], "in": [2], "model": [0], "models": ["claude-opus-5-5"], "out": null},
      "calls_from": "client_first_call",
      "coverage": {"calls": 1, "of": 3, "sum_complete": false},
      "success": true,
      "turns": 3,
      "usd": 0.0899218,
      "usd_client": 0.08992180000000001,
      "usd_recomputed": null,
      "usd_recomputed_reason": "first_call_only"
     }
    },
    {
     "gateway": {
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      "calls_from": "ledger_first_row",
      "coverage": {"calls": 1, "of": 4, "sum_complete": true},
      "rest": {"cr": [50320], "cwx": [3629], "in": [8], "model": [0], "models": ["claude-opus-5-5"], "n": [3], "out": [465], "what": ["after_first_call"]},
      "success": true,
      "turns": 4,
      "usd": 0.077235,
      "usd_client": 0.0772348,
      "usd_recomputed": 0.077235,
      "usd_recomputed_low": 0.066348
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     "pair": 2,
     "plain": {
      "calls": {"cr": [10118], "cw1h": [5563], "in": [2], "model": [0], "models": ["claude-opus-5-5"], "out": null},
      "calls_from": "client_first_call",
      "coverage": {"calls": 1, "of": 3, "sum_complete": false},
      "success": true,
      "turns": 3,
      "usd": 0.0911418,
      "usd_client": 0.09114180000000001,
      "usd_recomputed": null,
      "usd_recomputed_reason": "first_call_only"
     }
    },
    {
     "gateway": {
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      "calls_from": "ledger_first_row",
      "coverage": {"calls": 1, "of": 3, "sum_complete": true},
      "rest": {"cr": [32244], "cwx": [3105], "in": [6], "model": [0], "models": ["claude-opus-5-5"], "n": [2], "out": [232], "what": ["after_first_call"]},
      "success": true,
      "turns": 3,
      "usd": 0.064144,
      "usd_client": 0.0641436,
      "usd_recomputed": 0.064144,
      "usd_recomputed_low": 0.054829
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     "pair": 3,
     "plain": {
      "calls": {"cr": [10118], "cw1h": [5563], "in": [2], "model": [0], "models": ["claude-opus-5-5"], "out": null},
      "calls_from": "client_first_call",
      "coverage": {"calls": 1, "of": 3, "sum_complete": false},
      "success": true,
      "turns": 3,
      "usd": 0.08934,
      "usd_client": 0.08934,
      "usd_recomputed": null,
      "usd_recomputed_reason": "first_call_only"
     }
    },
    {
     "gateway": {
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      "calls_from": "ledger_first_row",
      "coverage": {"calls": 1, "of": 3, "sum_complete": true},
      "rest": {"cr": [32262], "cwx": [3130], "in": [6], "model": [0], "models": ["claude-opus-5-5"], "n": [2], "out": [267], "what": ["after_first_call"]},
      "success": true,
      "turns": 3,
      "usd": 0.065623,
      "usd_client": 0.06562319999999999,
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      "usd_recomputed_low": 0.056233
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     "pair": 4,
     "plain": {
      "calls": {"cr": [10118], "cw1h": [5563], "in": [2], "model": [0], "models": ["claude-opus-5-5"], "out": null},
      "calls_from": "client_first_call",
      "coverage": {"calls": 1, "of": 3, "sum_complete": false},
      "success": true,
      "turns": 3,
      "usd": 0.0914054,
      "usd_client": 0.09140539999999998,
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      "usd_recomputed_reason": "first_call_only"
     }
    },
    {
     "gateway": {
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      "calls_from": "ledger_first_row",
      "coverage": {"calls": 1, "of": 3, "sum_complete": true},
      "rest": {"cr": [32848], "cwx": [3862], "in": [6], "model": [0], "models": ["claude-opus-5-5"], "n": [2], "out": [294], "what": ["after_first_call"]},
      "success": true,
      "turns": 3,
      "usd": 0.071664,
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     "pair": 5,
     "plain": {
      "calls": {"cr": [10118], "cw1h": [5562], "in": [2], "model": [0], "models": ["claude-opus-5-5"], "out": null},
      "calls_from": "client_first_call",
      "coverage": {"calls": 1, "of": 3, "sum_complete": false},
      "success": true,
      "turns": 3,
      "usd": 0.0894516,
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     }
    },
    {
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      "calls_from": "ledger_first_row",
      "coverage": {"calls": 1, "of": 3, "sum_complete": true},
      "rest": {"cr": [32776], "cwx": [3651], "in": [6], "model": [0], "models": ["claude-opus-5-5"], "n": [2], "out": [271], "what": ["after_first_call"]},
      "success": true,
      "turns": 3,
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     "pair": 6,
     "plain": {
      "calls": {"cr": [10118], "cw1h": [5563], "in": [2], "model": [0], "models": ["claude-opus-5-5"], "out": null},
      "calls_from": "client_first_call",
      "coverage": {"calls": 1, "of": 3, "sum_complete": false},
      "success": true,
      "turns": 3,
      "usd": 0.088324,
      "usd_client": 0.088324,
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     }
    },
    {
     "gateway": {
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      "calls_from": "ledger_first_row",
      "coverage": {"calls": 1, "of": 3, "sum_complete": true},
      "rest": {"cr": [32809], "cwx": [3680], "in": [6], "model": [0], "models": ["claude-opus-5-5"], "n": [2], "out": [282], "what": ["after_first_call"]},
      "success": true,
      "turns": 3,
      "usd": 0.068229,
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     "pair": 7,
     "plain": {
      "calls": {"cr": [10118], "cw1h": [5562], "in": [2], "model": [0], "models": ["claude-opus-5-5"], "out": null},
      "calls_from": "client_first_call",
      "coverage": {"calls": 1, "of": 3, "sum_complete": false},
      "success": true,
      "turns": 3,
      "usd": 0.0887034,
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     }
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    {
     "gateway": {
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      "calls_from": "ledger_first_row",
      "coverage": {"calls": 1, "of": 4, "sum_complete": true},
      "rest": {"cr": [50358], "cwx": [3719], "in": [8], "model": [0], "models": ["claude-opus-5-5"], "n": [3], "out": [527], "what": ["after_first_call"]},
      "success": true,
      "turns": 4,
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     "pair": 8,
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    },
    {
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      "rest": {"cr": [32787], "cwx": [3648], "in": [6], "model": [0], "models": ["claude-opus-5-5"], "n": [2], "out": [248], "what": ["after_first_call"]},
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     "pair": 9,
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      "turns": 3,
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    {
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      "coverage": {"calls": 1, "of": 3, "sum_complete": true},
      "rest": {"cr": [32850], "cwx": [3742], "in": [6], "model": [0], "models": ["claude-opus-5-5"], "n": [2], "out": [269], "what": ["after_first_call"]},
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      "turns": 3,
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     "pair": 10,
     "plain": {
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      "turns": 3,
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    {
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      "rest": {"cr": [32264], "cwx": [3125], "in": [6], "model": [0], "models": ["claude-opus-5-5"], "n": [2], "out": [257], "what": ["after_first_call"]},
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     "pair": 11,
     "plain": {
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      "turns": 3,
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    {
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      "rest": {"cr": [32773], "cwx": [3648], "in": [6], "model": [0], "models": ["claude-opus-5-5"], "n": [2], "out": [253], "what": ["after_first_call"]},
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      "turns": 3,
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     "pair": 12,
     "plain": {
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      "turns": 3,
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    {
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      "rest": {"cr": [32776], "cwx": [3637], "in": [6], "model": [0], "models": ["claude-opus-5-5"], "n": [2], "out": [264], "what": ["after_first_call"]},
      "success": true,
      "turns": 3,
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     "pair": 13,
     "plain": {
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    {
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     "pair": 14,
     "plain": {
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      "calls_from": "client_first_call",
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    {
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      "rest": {"cr": [32785], "cwx": [3660], "in": [6], "model": [0], "models": ["claude-opus-5-5"], "n": [2], "out": [261], "what": ["after_first_call"]},
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     "pair": 15,
     "plain": {
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      "calls_from": "client_first_call",
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    },
    {
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}