{
 "schema": "fp32-fidelity-probe/1",
 "date": "2026-09-16",
 "device": "iPhone 17 Pro, iOS 27.0 (24A437)",
 "prompt": "Explain in a short paragraph why the sky is blue.",
 "template": "MiniCPM5 chat, no-think (enable_thinking=false), identical ids on both arms",
 "prompt_ids": [
  0,
  130072,
  8448,
  220,
  77524,
  310,
  280,
  2871,
  14504,
  3212,
  285,
  9467,
  357,
  5863,
  35,
  130073,
  220,
  130072,
  130071,
  220,
  8,
  130063,
  9,
  130063
 ],
 "oracle": {
  "model": "openbmb/MiniCPM5-2B fp32 transformers, greedy",
  "ids": [
   608,
   9467,
   5957,
   5863,
   1388,
   304,
   280,
   12488,
   2389,
   65858,
   13442,
   35,
   2471,
   25753,
   22867,
   1006,
   12087,
   33,
   411,
   54738,
   401,
   285,
   12216,
   11024,
   304,
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   35,
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   304,
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   33,
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   5863,
   316,
   53015,
   33,
   457,
   19880,
   746,
   9514,
   848,
   4228,
   34843,
   33,
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   390,
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   35,
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   1006,
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   10916,
   317,
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   33,
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   35,
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   285,
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   33,
   285,
   9467,
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   317,
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   285,
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   317,
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   304,
   285,
   12087,
   1482,
   14911,
   1006,
   2581,
   35,
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  ],
  "margins_top2_softmax": [
   1.0,
   1.0,
   0.998,
   1.0,
   0.945,
   1.0,
   0.998,
   0.939,
   0.99,
   0.851,
   0.998,
   1.0,
   0.954,
   0.977,
   0.18,
   0.922,
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   1.0,
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   1.0,
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   0.748,
   0.721,
   0.694,
   1.0,
   0.646,
   0.998,
   0.931,
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   0.168,
   0.995,
   0.955,
   0.959,
   1.0,
   0.987,
   0.988,
   0.999,
   0.078,
   0.949,
   0.973,
   0.974,
   0.929,
   0.681,
   1.0,
   0.997,
   0.244,
   0.208,
   0.791,
   0.99,
   0.587,
   0.922,
   0.977,
   1.0,
   0.998,
   0.741,
   0.986,
   0.433,
   0.877,
   0.998,
   0.358,
   0.097,
   0.549,
   0.532,
   0.144,
   0.085,
   0.987,
   0.991,
   0.275,
   0.999,
   0.218,
   0.967,
   0.525,
   0.961,
   0.102,
   0.985,
   0.983,
   0.366,
   0.558,
   1.0,
   0.989,
   0.985,
   0.999,
   0.48,
   0.057,
   0.939,
   0.14,
   0.9,
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   0.838,
   0.827,
   0.532,
   0.808,
   0.912,
   0.927,
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   1.0,
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   1.0,
   0.968,
   0.088,
   0.99,
   0.991,
   0.999,
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   0.856
  ],
  "text": "The sky appears blue because of a phenomenon called Rayleigh scattering. When sunlight enters our atmosphere, it interacts with the tiny molecules of air. Shorter wavelengths of light, like blue and violet, are scattered more strongly than longer wavelengths, such as red. While our eyes are more sensitive to blue, the scattered blue light dominates our view, especially during the day when the sun is high. As the sun lowers toward the horizon, the sky shifts to cream or red because the light has to travel through more of the atmosphere before reaching our eyes."
 },
 "arms": {
  "minicpm5_2b_ane (ios-ane-h18p, 4-bit k-means g32, ANE)": {
   "text": "To understand why the sky appears blue, you must look at the **shortwave** of sunlight as it travels through the **thin** air of our atmosphere. The sun's light is made of all visible colors, but our eyes and our perception are limited by the fact that shorter wavelengths travel faster than longer ones. When sunlight passes through this thin medium, the blue wavelengths are scattered more effectively than the red or green ones, causing our eyes to perceive the sky as blue.",
   "first_divergence_step": 0,
   "oracle_margin_there": 1.0,
   "note": "margin-clear flip at step 0 ('The' -> 'To'); the answer that follows is not the fp32 answer and is physically wrong ('shorter wavelengths travel faster')"
  },
  "minicpm5_2b_gpu_int8 (int8 per-block-32, GPU pipelined)": {
   "text": "The sky appears blue because of a phenomenon called Rayleigh scattering. When sunlight enters our atmosphere, it is made up of many different colors, but the shorter blue wavelengths are scattered more easily by the tiny molecules of air. As we look up, these scattered blue photons fill our eyes, making the sky look blue. If you are over water or in a valley with less air, the sky appears more white or gray because the blue light has been scattered away. This effect also explains why the sun looks white when it is far away, as its light has had time to scatter across the entire atmosphere.",
   "first_divergence_step": 19,
   "oracle_margin_there": 0.094,
   "note": "diverges only at a near-tie below the 0.1 floor (' interacts' vs ' is'); stays on the Rayleigh explanation"
  }
 },
 "read": "The device gate (3 fixture prompts, 48 steps) passed both bundles; this longer free-form chat prompt separates them: the 4-bit palettized ANE bundle is not fp32-faithful here, the int8 GPU bundle is (to the floor)."
}