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          "ttft_change_percent_right_vs_left": -0.551941714006654,
          "elapsed_speedup_left_over_right": 1.0040487341468696,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "grow1",
          "ttft_speedup_left_over_right": 2.377388339978015,
          "ttft_change_percent_right_vs_left": -57.93703606667611,
          "elapsed_speedup_left_over_right": 1.9559925669369673,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "grow2",
          "ttft_speedup_left_over_right": 3.814919877594125,
          "ttft_change_percent_right_vs_left": -73.78712968853624,
          "elapsed_speedup_left_over_right": 2.672420096882687,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "repeat",
          "ttft_speedup_left_over_right": 2.5654574782264197,
          "ttft_change_percent_right_vs_left": -61.02059735983888,
          "elapsed_speedup_left_over_right": 1.9859721135456951,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "return_a",
          "ttft_speedup_left_over_right": 3.816105284731641,
          "ttft_change_percent_right_vs_left": -73.79527226355542,
          "elapsed_speedup_left_over_right": 2.67278537576229,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        }
      ]
    },
    {
      "left": "b-8k",
      "right": "d-8k",
      "left_arm": "B",
      "right_arm": "D",
      "corpus_sha256": "8bdabf32986c87bd1ec67b83f1b95cd3d2cf6c93b81eda130f8cbe67ccd95af0",
      "target_prompt_tokens": 8000,
      "exact_payloads_match": true,
      "both_runs_pass": true,
      "four_turn_elapsed_speedup_left_over_right": 1.7614040890070122,
      "cases": [
        {
          "case": "branch_b",
          "ttft_speedup_left_over_right": 4.857576562223521,
          "ttft_change_percent_right_vs_left": -79.41360291103148,
          "elapsed_speedup_left_over_right": 3.0375247252982724,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "changed_prefix",
          "ttft_speedup_left_over_right": 1.0753330258054514,
          "ttft_change_percent_right_vs_left": -7.00555307031745,
          "elapsed_speedup_left_over_right": 1.0740207808628923,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "cold",
          "ttft_speedup_left_over_right": 1.0757662669209316,
          "ttft_change_percent_right_vs_left": -7.043004530881092,
          "elapsed_speedup_left_over_right": 1.0601366764734643,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "grow1",
          "ttft_speedup_left_over_right": 2.5139616442661468,
          "ttft_change_percent_right_vs_left": -60.22214570055976,
          "elapsed_speedup_left_over_right": 2.0331318481447833,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "grow2",
          "ttft_speedup_left_over_right": 4.034440271053515,
          "ttft_change_percent_right_vs_left": -75.21341418350285,
          "elapsed_speedup_left_over_right": 2.759061346149131,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "repeat",
          "ttft_speedup_left_over_right": 2.746710958758653,
          "ttft_change_percent_right_vs_left": -63.592820103213946,
          "elapsed_speedup_left_over_right": 2.0712925822538026,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "return_a",
          "ttft_speedup_left_over_right": 4.034979460158233,
          "ttft_change_percent_right_vs_left": -75.21672638301895,
          "elapsed_speedup_left_over_right": 2.7610826251130938,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        }
      ]
    },
    {
      "left": "c-40k",
      "right": "d-40k",
      "left_arm": "C",
      "right_arm": "D",
      "corpus_sha256": "6bdaee640719b17b78b1959f3257e188ea0560f20fab0e1b506f5bad005ef3da",
      "target_prompt_tokens": 40000,
      "exact_payloads_match": true,
      "both_runs_pass": true,
      "four_turn_elapsed_speedup_left_over_right": 1.0511813227106939,
      "cases": [
        {
          "case": "branch_b",
          "ttft_speedup_left_over_right": 1.0585452988541075,
          "ttft_change_percent_right_vs_left": -5.530731553716583,
          "elapsed_speedup_left_over_right": 1.0567532126479569,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "changed_prefix",
          "ttft_speedup_left_over_right": 1.0607802038957637,
          "ttft_change_percent_right_vs_left": -5.729764155905781,
          "elapsed_speedup_left_over_right": 1.0546528866871883,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "cold",
          "ttft_speedup_left_over_right": 1.0612117533649148,
          "ttft_change_percent_right_vs_left": -5.768099832179885,
          "elapsed_speedup_left_over_right": 1.0584473993437247,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "grow1",
          "ttft_speedup_left_over_right": 1.0439638942523097,
          "ttft_change_percent_right_vs_left": -4.211246623983767,
          "elapsed_speedup_left_over_right": 1.0323031237806521,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "grow2",
          "ttft_speedup_left_over_right": 1.045737244795111,
          "ttft_change_percent_right_vs_left": -4.373684213960671,
          "elapsed_speedup_left_over_right": 1.0329462118260457,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "repeat",
          "ttft_speedup_left_over_right": 1.0403658168696397,
          "ttft_change_percent_right_vs_left": -3.879963779576745,
          "elapsed_speedup_left_over_right": 1.024880607244231,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "return_a",
          "ttft_speedup_left_over_right": 1.0427391944332451,
          "ttft_change_percent_right_vs_left": -4.098742491066998,
          "elapsed_speedup_left_over_right": 1.030919250477298,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        }
      ]
    },
    {
      "left": "c-8k",
      "right": "d-8k",
      "left_arm": "C",
      "right_arm": "D",
      "corpus_sha256": "8bdabf32986c87bd1ec67b83f1b95cd3d2cf6c93b81eda130f8cbe67ccd95af0",
      "target_prompt_tokens": 8000,
      "exact_payloads_match": true,
      "both_runs_pass": true,
      "four_turn_elapsed_speedup_left_over_right": 1.0457564115319284,
      "cases": [
        {
          "case": "branch_b",
          "ttft_speedup_left_over_right": 1.0589882832612258,
          "ttft_change_percent_right_vs_left": -5.570248905829955,
          "elapsed_speedup_left_over_right": 1.0305587309836304,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "changed_prefix",
          "ttft_speedup_left_over_right": 1.0688792260399929,
          "ttft_change_percent_right_vs_left": -6.44406069104535,
          "elapsed_speedup_left_over_right": 1.0849086951492661,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "cold",
          "ttft_speedup_left_over_right": 1.0698286641485828,
          "ttft_change_percent_right_vs_left": -6.527088541243698,
          "elapsed_speedup_left_over_right": 1.0558617728593145,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "grow1",
          "ttft_speedup_left_over_right": 1.0574467797252658,
          "ttft_change_percent_right_vs_left": -5.432592999166442,
          "elapsed_speedup_left_over_right": 1.0394374101986563,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "grow2",
          "ttft_speedup_left_over_right": 1.057542596044725,
          "ttft_change_percent_right_vs_left": -5.441161070952393,
          "elapsed_speedup_left_over_right": 1.0324205200250922,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "repeat",
          "ttft_speedup_left_over_right": 1.0706515239759653,
          "ttft_change_percent_right_vs_left": -6.598928072655619,
          "elapsed_speedup_left_over_right": 1.0429615643271943,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "return_a",
          "ttft_speedup_left_over_right": 1.0573553817559267,
          "ttft_change_percent_right_vs_left": -5.424418577288359,
          "elapsed_speedup_left_over_right": 1.0330356676415222,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        }
      ]
    },
    {
      "left": "c-repeat-40k",
      "right": "d-repeat-40k",
      "left_arm": "C",
      "right_arm": "D",
      "corpus_sha256": "a301679a1a10a7eb6997d34a7738eb2a742d5d02518e9bf6af234c676c201d7d",
      "target_prompt_tokens": 40000,
      "exact_payloads_match": true,
      "both_runs_pass": true,
      "four_turn_elapsed_speedup_left_over_right": null,
      "cases": [
        {
          "case": "cold",
          "ttft_speedup_left_over_right": 1.041891580075136,
          "ttft_change_percent_right_vs_left": -4.020723545161486,
          "elapsed_speedup_left_over_right": 1.030244358940253,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        },
        {
          "case": "repeat",
          "ttft_speedup_left_over_right": 1.0233259804133088,
          "ttft_change_percent_right_vs_left": -2.279428145065532,
          "elapsed_speedup_left_over_right": 0.9389065813991155,
          "answer_json_equal": true,
          "output_bytes_equal": true,
          "completion_token_difference": 0
        }
      ]
    }
  ],
  "decode_comparisons": [
    {
      "left": "a-decode",
      "right": "b-decode",
      "exact_payloads_match": true,
      "client_decode_rate_ratio_right_over_left": 0.8510983526220255,
      "client_decode_rate_change_percent": -14.890164737797452,
      "both_complete": true,
      "measured_speculative_counts_equal": false,
      "both_have_zero_cached_prompt_tokens": true,
      "measured_output_bytes_equal": [
        {
          "index": 1,
          "equal": false
        },
        {
          "index": 2,
          "equal": false
        }
      ]
    },
    {
      "left": "a-decode",
      "right": "c-decode",
      "exact_payloads_match": true,
      "client_decode_rate_ratio_right_over_left": 0.8392688091453236,
      "client_decode_rate_change_percent": -16.073119085467635,
      "both_complete": true,
      "measured_speculative_counts_equal": false,
      "both_have_zero_cached_prompt_tokens": true,
      "measured_output_bytes_equal": [
        {
          "index": 1,
          "equal": false
        },
        {
          "index": 2,
          "equal": false
        }
      ]
    },
    {
      "left": "a-decode",
      "right": "d-decode",
      "exact_payloads_match": true,
      "client_decode_rate_ratio_right_over_left": 0.8222447274906842,
      "client_decode_rate_change_percent": -17.775527250931578,
      "both_complete": true,
      "measured_speculative_counts_equal": false,
      "both_have_zero_cached_prompt_tokens": true,
      "measured_output_bytes_equal": [
        {
          "index": 1,
          "equal": false
        },
        {
          "index": 2,
          "equal": false
        }
      ]
    },
    {
      "left": "b-decode",
      "right": "c-decode",
      "exact_payloads_match": true,
      "client_decode_rate_ratio_right_over_left": 0.9861008502245857,
      "client_decode_rate_change_percent": -1.3899149775414288,
      "both_complete": true,
      "measured_speculative_counts_equal": true,
      "both_have_zero_cached_prompt_tokens": true,
      "measured_output_bytes_equal": [
        {
          "index": 1,
          "equal": true
        },
        {
          "index": 2,
          "equal": true
        }
      ]
    },
    {
      "left": "b-decode",
      "right": "d-decode",
      "exact_payloads_match": true,
      "client_decode_rate_ratio_right_over_left": 0.9660983656677864,
      "client_decode_rate_change_percent": -3.3901634332213604,
      "both_complete": true,
      "measured_speculative_counts_equal": false,
      "both_have_zero_cached_prompt_tokens": true,
      "measured_output_bytes_equal": [
        {
          "index": 1,
          "equal": false
        },
        {
          "index": 2,
          "equal": false
        }
      ]
    },
    {
      "left": "c-decode",
      "right": "d-decode",
      "exact_payloads_match": true,
      "client_decode_rate_ratio_right_over_left": 0.9797155792409633,
      "client_decode_rate_change_percent": -2.028442075903669,
      "both_complete": true,
      "measured_speculative_counts_equal": false,
      "both_have_zero_cached_prompt_tokens": true,
      "measured_output_bytes_equal": [
        {
          "index": 1,
          "equal": false
        },
        {
          "index": 2,
          "equal": false
        }
      ]
    }
  ],
  "limitations": [
    "A/B/C/D are experiment labels. Effective startup configuration and dispatch evidence must establish each implementation.",
    "A to B measures the whole GDN fallback change. B to C cold measures APC/alignment overhead. C cold to C hit measures reuse in one implementation.",
    "Cached logical prompt tokens divided by TTFT are not computed prefill throughput. Computed-token and cache-hit counters are reported separately.",
    "The four-request sequence is cold, identical repeat, then two growing turns; its duration sums request elapsed durations, excluding gaps and metrics scraping. It is not four natural chat turns.",
    "Server prefill/decode/queue seconds are wall-clock request-phase histogram deltas recorded by vLLM, not isolated GPU kernel timings.",
    "Marker retrieval uses fixed correct assistant history, not the preceding generated bytes. Passing markers is not token/logit equivalence or broad quality qualification.",
    "The decode probe has one excluded warmup and two capped 512-token requests. It does not score completed code or sustained multi-user workloads.",
    "Client decode estimates use nonempty SSE-delta boundaries; speculative chunks can contain several tokens. Server decode-duration counters are also retained.",
    "Different generated continuations or speculative acceptance across implementations can change decode throughput; this probe does not isolate kernel cost.",
    "Equal allocated cache bytes do not imply equal usable attention/recurrent capacity. Reported token capacity is the server estimate, not measured maximum residency.",
    "VRAM peaks are maxima among approximately one-second device-memory samples inside recorded request windows. They can miss short peaks and are not exact allocator peaks.",
    "Missing runs are pending. Partial runs, errors, payload mismatches, and negative metric deltas remain visible; they are not silently dropped."
  ],
  "warnings": [],
  "scope": "Targeted APC measurements; raw HTTP evidence is in raw-evidence.tar.gz.",
  "field_note": "Legacy four_turn_* field names mean four requests: cold, identical repeat, grow1, grow2. This is not four natural conversation turns.",
  "analysis_input_sha256": "c294bbee51f0db26eb15c2bc26ccbfb5a876ec02734627702aed3d2956cb20e5"
}
