Qwen3.8-27B-MTPLX-Bare-Speed-FP16 / mtplx_runtime.json
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Quantized MTP draft head (INT4/g64 affine, all 8 head matrices)
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{
"arch_id": "qwen3-next-mtp",
"artifact_role": "forge-local",
"base_trunk": "/Users/youssof/.mtplx/models/Qwen--Qwen3.8-27B",
"exactness_baseline": {},
"forge_provenance": {
"forge_inputs": {
"mtp_source_path": "/Users/youssof/.mtplx/models/Qwen--Qwen3.8-27B",
"trunk_path": "/Users/youssof/.mtplx/models/Qwen3.8-27B-MTPLX-Bare-Speed"
},
"forge_recipe": {
"body_bits": 4,
"body_group_size": 64,
"body_mode": "affine",
"mtp_policy": "keep_bf16"
},
"forged_at": "2026-08-14T08:40:15-07:00",
"forged_locally": true,
"mtp_contract": {
"base_hidden_variant": "post_norm",
"concat_order": "embedding_hidden",
"hidden_variant": "post_norm",
"mtp_position_mode": "local",
"mtp_quant_group_size": 64,
"mtp_quant_mode": "affine"
},
"mtplx_version": "2.6.0",
"published_to_hf": null,
"source_format": "bf16_native",
"source_repo": "Qwen/Qwen3.8-27B",
"source_sha": "1d4bf0f2ff6012fd82039f2fa52739d0dd7c60c0",
"head_quantization": {
"bits": 4,
"group_size": 64,
"mode": "affine",
"policy": "all",
"quantized_at": "2026-08-20T04:49:59Z",
"source_sidecar_bytes": 849400388,
"quantized_sidecar_bytes": 238934226,
"tool": "scripts/build_qwen38_q4head_sidecar.py",
"note": "Structural head quantization of the released sidecar; no calibration, no training. Trunk weights unchanged."
}
},
"mtp_contract": {
"base_hidden_variant": "post_norm",
"concat_order": "embedding_hidden",
"hidden_variant": "post_norm",
"mtp_position_mode": "local",
"mtp_quant_group_size": 64,
"mtp_quant_mode": "affine"
},
"mtp_depth_default": 3,
"mtp_depth_max": 6,
"mtp_sidecar": "int4-g64-prequantized",
"mtplx_version": "2.9.0",
"precision_policy": {
"intended_default_for": [
"m1",
"m2"
],
"note": "FP16 precision sibling of Qwen3.8-27B-MTPLX-Bare-Speed: byte-identical INT packs, bf16 floats cast to fp16 for M1/M2 Macs. Same tuned depth/draft-sampler stamps as the parent; not a separate speed claim.",
"routing": "mtplx start auto-selects this artifact on M1/M2 Apple Silicon",
"variant": "fp16"
},
"precision_variant": "fp16",
"public_model_id": "mtplx-qwen38-27b-bare-speed-fp16",
"recommended_draft_sampler": {
"temperature": 1.0,
"top_k": 20,
"top_p": 0.95
},
"recommended_profile": "turbo",
"release_validation": {
"dropday_bare_draft_sampler": {
"date": "2026-08-14",
"evidence": "in-contract A/B strict max-fans: 46.1 tok/s (draft 0.6) vs 42.4 (draft 1.0); exactness unaffected (probability-ratio acceptance corrects any draft distribution). App launch preset pins the same 0.6.",
"verdict": "draft_temperature 0.6"
},
"native_sampling": {
"acceptance_by_depth": [
0.9827586206896551,
0.9655172413793104,
0.9482758620689655,
0.896551724137931,
0.8793103448275862,
0.7931034482758621
],
"decode_tok_s_repeats": [
90.76619500629357,
95.88058748793716
],
"depth": 6,
"end_to_end_tok_s_repeats": [
86.21504502891067,
90.85944248298674
],
"peak_memory_bytes": 16728221169,
"profile": "turbo",
"sampler": {
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"top_k": 20,
"top_p": 0.95
},
"suite": "cold-long-code-192",
"validations_passed": 2,
"validations_total": 2
},
"strict_draft_sampler_ab": {
"acceptance_by_depth_draft_0_6": [
0.6886792452830188,
0.42384887839433294,
0.23376623376623376
],
"acceptance_by_depth_draft_1_0": [
0.7490470139771284,
0.4920534011443102,
0.28544183089637637
],
"accepted_tokens_per_verify_draft_0_6": 1.3423529411764705,
"accepted_tokens_per_verify_draft_1_0": 1.5221799746514575,
"decode_tok_s_draft_0_6": [
42.97683083623381,
42.6065647102868
],
"decode_tok_s_draft_1_0": [
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45.292323193319085
],
"depth": 3,
"max_fans_verified": true,
"prompt": "single-file HTML5 Flappy Bird, xhigh reasoning",
"response_tokens": 2000,
"verdict": "keep_official_draft_sampler_1_0"
}
},
"sampler": {
"temperature": 1.0,
"top_k": 20,
"top_p": 0.95
},
"speed_evidence": {
"depth": 3,
"tok_s": [
50.16132899123467
],
"acceptance_by_depth": [
0.9501557632398754,
0.881619937694704,
0.7850467289719626
],
"greedy_diagnostic": {
"tok_s": 21.672618440463108
},
"forge_verify_rows": [
{
"acceptance_by_position": [],
"depth": 0,
"finish_reasons": {
"stop": 1
},
"hit_token_budget": false,
"hit_token_budget_count": 0,
"multiplier_vs_ar": 1.0,
"quality_passed": true,
"tok_s": 21.672618440463108,
"verify_time_s": 36.76132425002288
},
{
"acceptance_by_position": [
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],
"depth": 1,
"finish_reasons": {
"stop": 1
},
"hit_token_budget": false,
"hit_token_budget_count": 0,
"multiplier_vs_ar": 1.6570495033453116,
"quality_passed": true,
"tok_s": 35.91260162296184,
"verify_time_s": 12.544884410686791
},
{
"acceptance_by_position": [
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0.9265536723163842
],
"depth": 2,
"finish_reasons": {
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},
"hit_token_budget": false,
"hit_token_budget_count": 0,
"multiplier_vs_ar": 2.053854263060501,
"quality_passed": true,
"tok_s": 44.51239977562877,
"verify_time_s": 24.228063414688222
},
{
"acceptance_by_position": [
0.9501557632398754,
0.881619937694704,
0.7850467289719626
],
"depth": 3,
"finish_reasons": {
"stop": 1
},
"hit_token_budget": false,
"hit_token_budget_count": 0,
"multiplier_vs_ar": 2.314502473664313,
"quality_passed": true,
"tok_s": 50.16132899123467,
"verify_time_s": 22.989872808218934
}
],
"quality_rejected": [],
"acceptance_collapsed": [],
"failure_reasons": [],
"verdict": "mtp_depth_wins",
"artifact_fingerprint": "sha256:622ef11f76b446124bac1479881fe40a31d88f62274ee14a66e75c5a239b696a"
},
"verified_on": {
"timestamp": "2026-08-19T23:12:46-07:00",
"hardware": "macOS-26.3.1-arm64-arm-64bit-Mach-O",
"machine_arch": "arm64",
"macos": "26.3.1",
"model": "Qwen3.8-27B-MTPLX-Bare-Speed-FP16"
}
}