{
  "snapshotId": "2026-09-15-v1",
  "methodologyVersion": "1.0.0",
  "window": { "start": "2026-08-25", "end": "2026-09-15" },
  "updated": "2026-09-21",
  "metric": "avg_rtf",
  "engineSummaries": [
    { "engine": "kokoro", "platform": "android", "appVersion": "1.3.21", "configurationId": "kokoro-v5-fp32-sherpa-1.12.40", "medianRtf": 3.48, "p10Rtf": 2.326, "p90Rtf": 5.258, "medianConfiguredConcurrency": 2, "activeHealthSamples": 1998, "installations": 63 },
    { "engine": "kokoro", "platform": "ios", "appVersion": "1.3.19", "configurationId": "kokoro-v5-fp32-sherpa-1.12.40", "medianRtf": 1.325, "p10Rtf": 0.868, "p90Rtf": 2.322, "medianConfiguredConcurrency": 1, "activeHealthSamples": 5614, "installations": 59 },
    { "engine": "kokoro_fast", "platform": "ios", "appVersion": "1.3.19", "configurationId": "kokoro-fast-v3-mlx-bf16", "medianRtf": 0.438, "p10Rtf": 0.227, "p90Rtf": 0.672, "medianConfiguredConcurrency": 2, "activeHealthSamples": 2602, "installations": 105 },
    { "engine": "piper", "platform": "android", "appVersion": "1.3.21", "configurationId": "piper-v5-sherpa-1.12.40", "medianRtf": 0.247, "p10Rtf": 0.115, "p90Rtf": 0.782, "medianConfiguredConcurrency": 1, "activeHealthSamples": 11193, "installations": 297 },
    { "engine": "piper", "platform": "ios", "appVersion": "1.3.19", "configurationId": "piper-v5-sherpa-1.12.40", "medianRtf": 0.115, "p10Rtf": 0.088, "p90Rtf": 0.23, "medianConfiguredConcurrency": 1, "activeHealthSamples": 16620, "installations": 293 },
    { "engine": "supertonic", "platform": "android", "appVersion": "1.3.21", "configurationId": "supertonic-v7-upstream-v3", "medianRtf": 0.791, "p10Rtf": 0.385, "p90Rtf": 2.505, "medianConfiguredConcurrency": 1, "activeHealthSamples": 18865, "installations": 247 },
    { "engine": "supertonic", "platform": "ios", "appVersion": "1.3.19", "configurationId": "supertonic-v7-upstream-v3", "medianRtf": 0.304, "p10Rtf": 0.212, "p90Rtf": 0.531, "medianConfiguredConcurrency": 1, "activeHealthSamples": 43682, "installations": 244 }
  ],
  "devices": [
    { "engine": "kokoro_fast", "platform": "ios", "manufacturer": "Apple", "model": "iPhone16,1", "platformVersionRange": "iOS 26.5–26.6.2", "appVersion": "1.3.19", "configurationId": "kokoro-fast-v3-mlx-bf16", "medianRtf": 0.5, "p10Rtf": 0.379, "p90Rtf": 0.75, "medianConfiguredConcurrency": 2, "activeHealthSamples": 285, "installations": 10 },
    { "engine": "kokoro_fast", "platform": "ios", "manufacturer": "Apple", "model": "iPhone17,1", "platformVersionRange": "iOS 18.7.8–27.0", "appVersion": "1.3.19", "configurationId": "kokoro-fast-v3-mlx-bf16", "medianRtf": 0.469, "p10Rtf": 0.333, "p90Rtf": 0.673, "medianConfiguredConcurrency": 2, "activeHealthSamples": 275, "installations": 12 },
    { "engine": "piper", "platform": "ios", "manufacturer": "Apple", "model": "iPhone12,1", "platformVersionRange": "iOS 18.2–26.6.2", "appVersion": "1.3.19", "configurationId": "piper-v5-sherpa-1.12.40", "medianRtf": 0.196, "p10Rtf": 0.166, "p90Rtf": 0.797, "medianConfiguredConcurrency": 1, "activeHealthSamples": 260, "installations": 16 },
    { "engine": "piper", "platform": "ios", "manufacturer": "Apple", "model": "iPhone14,5", "platformVersionRange": "iOS 18.5–26.6.2", "appVersion": "1.3.19", "configurationId": "piper-v5-sherpa-1.12.40", "medianRtf": 0.153, "p10Rtf": 0.113, "p90Rtf": 0.274, "medianConfiguredConcurrency": 1, "activeHealthSamples": 399, "installations": 21 },
    { "engine": "piper", "platform": "ios", "manufacturer": "Apple", "model": "iPhone14,7", "platformVersionRange": "iOS 18.7.2–27.0", "appVersion": "1.3.19", "configurationId": "piper-v5-sherpa-1.12.40", "medianRtf": 0.133, "p10Rtf": 0.1, "p90Rtf": 0.249, "medianConfiguredConcurrency": 1, "activeHealthSamples": 2468, "installations": 13 },
    { "engine": "piper", "platform": "ios", "manufacturer": "Apple", "model": "iPhone15,2", "platformVersionRange": "iOS 18.5–26.6.2", "appVersion": "1.3.19", "configurationId": "piper-v5-sherpa-1.12.40", "medianRtf": 0.102, "p10Rtf": 0.093, "p90Rtf": 0.317, "medianConfiguredConcurrency": 1, "activeHealthSamples": 222, "installations": 15 },
    { "engine": "piper", "platform": "ios", "manufacturer": "Apple", "model": "iPhone15,3", "platformVersionRange": "iOS 26.6–27.0", "appVersion": "1.3.19", "configurationId": "piper-v5-sherpa-1.12.40", "medianRtf": 0.123, "p10Rtf": 0.092, "p90Rtf": 0.238, "medianConfiguredConcurrency": 1, "activeHealthSamples": 138, "installations": 12 },
    { "engine": "piper", "platform": "ios", "manufacturer": "Apple", "model": "iPhone15,4", "platformVersionRange": "iOS 26.3.1–27.0", "appVersion": "1.3.19", "configurationId": "piper-v5-sherpa-1.12.40", "medianRtf": 0.122, "p10Rtf": 0.097, "p90Rtf": 0.214, "medianConfiguredConcurrency": 1, "activeHealthSamples": 1428, "installations": 14 },
    { "engine": "piper", "platform": "ios", "manufacturer": "Apple", "model": "iPhone16,1", "platformVersionRange": "iOS 18.7.8–26.6.1", "appVersion": "1.3.19", "configurationId": "piper-v5-sherpa-1.12.40", "medianRtf": 0.106, "p10Rtf": 0.088, "p90Rtf": 0.174, "medianConfiguredConcurrency": 1, "activeHealthSamples": 373, "installations": 15 },
    { "engine": "piper", "platform": "ios", "manufacturer": "Apple", "model": "iPhone16,2", "platformVersionRange": "iOS 26.5–27.0", "appVersion": "1.3.19", "configurationId": "piper-v5-sherpa-1.12.40", "medianRtf": 0.11, "p10Rtf": 0.093, "p90Rtf": 0.129, "medianConfiguredConcurrency": 1, "activeHealthSamples": 168, "installations": 11 },
    { "engine": "piper", "platform": "ios", "manufacturer": "Apple", "model": "iPhone17,1", "platformVersionRange": "iOS 18.6.2–27.0", "appVersion": "1.3.19", "configurationId": "piper-v5-sherpa-1.12.40", "medianRtf": 0.103, "p10Rtf": 0.085, "p90Rtf": 0.175, "medianConfiguredConcurrency": 1, "activeHealthSamples": 512, "installations": 17 },
    { "engine": "piper", "platform": "ios", "manufacturer": "Apple", "model": "iPhone17,2", "platformVersionRange": "iOS 26.5.2–26.6.2", "appVersion": "1.3.19", "configurationId": "piper-v5-sherpa-1.12.40", "medianRtf": 0.101, "p10Rtf": 0.095, "p90Rtf": 0.21, "medianConfiguredConcurrency": 1, "activeHealthSamples": 234, "installations": 11 },
    { "engine": "piper", "platform": "ios", "manufacturer": "Apple", "model": "iPhone17,3", "platformVersionRange": "iOS 26.3–27.0", "appVersion": "1.3.19", "configurationId": "piper-v5-sherpa-1.12.40", "medianRtf": 0.115, "p10Rtf": 0.095, "p90Rtf": 0.186, "medianConfiguredConcurrency": 1, "activeHealthSamples": 2399, "installations": 27 },
    { "engine": "piper", "platform": "ios", "manufacturer": "Apple", "model": "iPhone18,1", "platformVersionRange": "iOS 26.3–26.6.1", "appVersion": "1.3.19", "configurationId": "piper-v5-sherpa-1.12.40", "medianRtf": 0.098, "p10Rtf": 0.089, "p90Rtf": 0.192, "medianConfiguredConcurrency": 1, "activeHealthSamples": 360, "installations": 10 },
    { "engine": "piper", "platform": "ios", "manufacturer": "Apple", "model": "iPhone18,2", "platformVersionRange": "iOS 26.6–27.0", "appVersion": "1.3.19", "configurationId": "piper-v5-sherpa-1.12.40", "medianRtf": 0.09, "p10Rtf": 0.088, "p90Rtf": 0.103, "medianConfiguredConcurrency": 1, "activeHealthSamples": 193, "installations": 11 },
    { "engine": "piper", "platform": "ios", "manufacturer": "Apple", "model": "iPhone18,3", "platformVersionRange": "iOS 26.6–27.0", "appVersion": "1.3.19", "configurationId": "piper-v5-sherpa-1.12.40", "medianRtf": 0.101, "p10Rtf": 0.086, "p90Rtf": 0.162, "medianConfiguredConcurrency": 1, "activeHealthSamples": 969, "installations": 14 },
    { "engine": "supertonic", "platform": "ios", "manufacturer": "Apple", "model": "iPhone14,5", "platformVersionRange": "iOS 18.5–26.6.2", "appVersion": "1.3.19", "configurationId": "supertonic-v7-upstream-v3", "medianRtf": 0.415, "p10Rtf": 0.334, "p90Rtf": 0.679, "medianConfiguredConcurrency": 1, "activeHealthSamples": 1756, "installations": 14 },
    { "engine": "supertonic", "platform": "ios", "manufacturer": "Apple", "model": "iPhone14,7", "platformVersionRange": "iOS 18.7.2–27.0", "appVersion": "1.3.19", "configurationId": "supertonic-v7-upstream-v3", "medianRtf": 0.394, "p10Rtf": 0.339, "p90Rtf": 0.477, "medianConfiguredConcurrency": 1, "activeHealthSamples": 391, "installations": 10 },
    { "engine": "supertonic", "platform": "ios", "manufacturer": "Apple", "model": "iPhone15,4", "platformVersionRange": "iOS 26.5–26.6.2", "appVersion": "1.3.19", "configurationId": "supertonic-v7-upstream-v3", "medianRtf": 0.309, "p10Rtf": 0.221, "p90Rtf": 0.428, "medianConfiguredConcurrency": 1, "activeHealthSamples": 5868, "installations": 12 },
    { "engine": "supertonic", "platform": "ios", "manufacturer": "Apple", "model": "iPhone16,1", "platformVersionRange": "iOS 26.5–26.6.2", "appVersion": "1.3.19", "configurationId": "supertonic-v7-upstream-v3", "medianRtf": 0.281, "p10Rtf": 0.216, "p90Rtf": 0.427, "medianConfiguredConcurrency": 1, "activeHealthSamples": 2181, "installations": 14 },
    { "engine": "supertonic", "platform": "ios", "manufacturer": "Apple", "model": "iPhone16,2", "platformVersionRange": "iOS 26.5–26.6.2", "appVersion": "1.3.19", "configurationId": "supertonic-v7-upstream-v3", "medianRtf": 0.324, "p10Rtf": 0.21, "p90Rtf": 0.5, "medianConfiguredConcurrency": 1, "activeHealthSamples": 2942, "installations": 12 },
    { "engine": "supertonic", "platform": "ios", "manufacturer": "Apple", "model": "iPhone17,1", "platformVersionRange": "iOS 18.5–27.0", "appVersion": "1.3.19", "configurationId": "supertonic-v7-upstream-v3", "medianRtf": 0.271, "p10Rtf": 0.218, "p90Rtf": 0.36, "medianConfiguredConcurrency": 1, "activeHealthSamples": 2235, "installations": 17 },
    { "engine": "supertonic", "platform": "ios", "manufacturer": "Apple", "model": "iPhone17,3", "platformVersionRange": "iOS 26.3–26.6.2", "appVersion": "1.3.19", "configurationId": "supertonic-v7-upstream-v3", "medianRtf": 0.283, "p10Rtf": 0.22, "p90Rtf": 0.466, "medianConfiguredConcurrency": 1, "activeHealthSamples": 1958, "installations": 14 },
    { "engine": "supertonic", "platform": "ios", "manufacturer": "Apple", "model": "iPhone18,1", "platformVersionRange": "iOS 26.3–27.0", "appVersion": "1.3.19", "configurationId": "supertonic-v7-upstream-v3", "medianRtf": 0.247, "p10Rtf": 0.21, "p90Rtf": 0.459, "medianConfiguredConcurrency": 1, "activeHealthSamples": 2624, "installations": 12 },
    { "engine": "supertonic", "platform": "ios", "manufacturer": "Apple", "model": "iPhone18,3", "platformVersionRange": "iOS 26.5.2–27.0", "appVersion": "1.3.19", "configurationId": "supertonic-v7-upstream-v3", "medianRtf": 0.278, "p10Rtf": 0.227, "p90Rtf": 0.38, "medianConfiguredConcurrency": 1, "activeHealthSamples": 1074, "installations": 24 }
  ]
}