{
  "version": "ft1-2026-08-13",
  "model_url": "https://github.com/Phineas1500/sieve-ai-image-detector/releases/download/v0.1.0/ft1_best_fp16.onnx",
  "sha256": "87277637277f7d4f82222f0aaf1b4b114132ca13e5e4f02f71a65693e9606aed",
  "input_size": 384,
  "resize_shorter_side": 440,
  "norm_mean": [0.485, 0.456, 0.406],
  "norm_std": [0.229, 0.224, 0.225],
  "calibration": { "type": "sigmoid", "temperature": 1.0, "bias": 0.88 },
  "notes": "model_url is pinned at build time; the extension never downloads anything after initial setup. Calibration places the 0.65 confidence threshold at the operating point maximizing worst-case balanced accuracy across clean/web/hard degradation on the held-out proxy benchmark, constrained to keep real-photo accuracy >= 95%."
}