{
  "arch_id": "qwen3-next-mtp",
  "artifact_role": "small-q4-speed-test",
  "base_trunk": "mlx-community/Qwen3.5-4B-MLX-4bit",
  "exactness_baseline": {
    "artifact": "/Users/youssof/.mtplx/qwen35_4b_final_mtp1_gate.json",
    "gate": "mtp1-greedy-ar-equivalence",
    "max_tokens": 16,
    "matches": 1,
    "scope": "greedy AR and MTP1 generated identical token sequence on the warm_code_continuation prompt",
    "seed": 0,
    "status": "passed",
    "total": 1
  },
  "mtp_depth_max": 2,
  "mtp_sidecar": "official Qwen/Qwen3.5-4B MTP tensors; quantization recorded in config.json",
  "mtplx_version": "0.1.0-preview",
  "recommended_draft_lm_head": {
    "bits": 4,
    "group_size": 64,
    "mode": "affine"
  },
  "recommended_draft_sampler": {
    "temperature": 0.6,
    "top_k": 20,
    "top_p": 0.95
  },
  "recommended_profile": "performance-cold",
  "sampler": {
    "temperature": 0.6,
    "top_k": 20,
    "top_p": 0.95
  },
  "speed_evidence": {
    "acceptance_by_depth": [
      0.6666666666666666,
      0.2222222222222222
    ],
    "accepted_drafts": 16,
    "ar_tok_s": 108.4050622912913,
    "artifact": "/Users/youssof/.mtplx/qwen35_4b_depth_grid_q4_body4_draftt0p6.json",
    "draft_lm_head": "tied embedding reused as 4-bit affine group64 draft head",
    "draft_temperature": 0.6,
    "enable_thinking": false,
    "generated_tokens": 48,
    "mtp_depth": 2,
    "mtp_tok_s": 120.05572596536466,
    "note": "Qwen3.5-4B measured fastest at depth 2. Depth 3 over-drafts this small native-MTP head and can lose to AR.",
    "sampler": {
      "temperature": 0.6,
      "top_k": 20,
      "top_p": 0.95
    },
    "speedup_vs_ar": 1.1074734281575087
  },
  "verified_on": {
    "hardware": "Apple Silicon local MTPLX workstation",
    "machine_arch": "arm64",
    "model": "Qwen3.5-4B-MTPLX-Optimized-Speed",
    "timestamp": "2026-05-04T06:17:00+0100"
  }
}