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META · FIELD VERIFIED

Muse Spark Open 816B-A42B NVFP4

Name: Muse Spark Open 816B-A42B NVFP4 verified model record
License: https://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B-NVFP4/blob/main/LICENSE.md

Primary sources last checked on 16 Oct 2026. Verification freshness is tracked separately from factual change, and unknown values remain explicit rather than inferred.

Source repository ↗Compare this model →History & diff →Machine-readable JSON ↗Field-verified 2026-10-16

Evidence statusSource-first verified

Last verified16 Oct 2026

Full field verification16 Oct 2026

Source policy →Methodology →

FRESHNESS & VERIFICATION

Current evidence, dated honestly.

A verification check does not pretend the model changed. Open Model Weights updates the verification date after a real primary-source check, while factual-update dates move only when retained source evidence changes.

Last verified: 16 Oct 2026
Last factual update: No change observed
Repository created: 15 Sep 2026

View observed history →View evidence JSON →View model JSON →

CONFLICT INTELLIGENCE

Claims stay attached to evidence class.

No active conflict · 1 comparison signalSource values differ in scope, granularity or claim strength; OMW does not overstate those differences as contradictions.

Comparison signals are not conflicts.1 current signal keeps scope/granularity differences visible without asserting contradiction.

COMPARISON SIGNALtotal parameters billionsscope or granularity difference

Publisher claims10

Source observed3

OMW derived3

OMW measured0

Conflict Intelligence →Conflict JSON ↗Evidence IDs ↗OMW measurement policy →

+ Save to my shortlist Monitor changes →Local browser monitoring · no background email alerts

MODEL INTELLIGENCE · SOURCE-FIRST

What is Muse Spark Open 816B-A42B NVFP4?

OMW evidence review16 Oct 2026

Open Model Weights records Muse Spark Open 816B-A42B NVFP4 as a 816B total / 42B active (publisher-described)-parameter text + image + audio + video → text open-weight model in the Muse Spark Open family, with Meta listed as the developer. The checked source repository provides 128 recognized weight artifacts, format evidence for Safetensors and a context window that is not declared in the checked standard sources. Values that are not evidenced in the checked sources remain explicitly undisclosed or unknown.

The repository declares Muse Model License. Commercial use is subject to the Muse Model License, Usage Policy, attribution and distribution terms; evaluate deployment and user restrictions individually. Open Model Weights reports the checked license evidence and classification; this is not legal advice.

The checked sources declare meta-models/Muse-Spark-Open-816B-A42B as lineage evidence. Training recipe status: training-described-in-model-card; data disclosure status: not-disclosed-in-standard-metadata-or-obvious-model-card-section.

Source repository ↗Model card ↗Configuration ↗License evidence ↗

DEPLOYMENT PROFILE

Weight memory, without pretending it is a deployment guarantee.

These bars visualize weight-only decimal-GB estimates. They exclude KV cache, activations, runtime overhead, optimizer state and sharding.

WEIGHT-ONLY MEMORY

BF16 / FP16~1,632.0 GB

FP8 / INT8~816.0 GB

INT4~408.0 GB

FIELD EVIDENCE MAP

WeightsVerified

LicenseVerified

Commercial useAllowed with conditions

ContextNot declared

FormatsVerified

LineageDeclared

Training recipeTraining described in model card

Training dataNot disclosed in standard metadata or obvious model card section

RuntimeSource-derived · not runtime-tested

LICENSE & USE

Muse Model License

Commercial use is subject to the Muse Model License, Usage Policy, attribution and distribution terms; evaluate deployment and user restrictions individually

Declared licenseMuse Model License

ClassificationAllowed with conditions

VerificationLicense file checked

This section summarizes the checked repository evidence. It is not legal advice. Inspect license evidence ↗

LINEAGE & PROVENANCE

What the checked sources disclose — and what they do not.

Open Model Weights does not infer a hidden base model or training corpus when the checked sources do not declare one.

LINEAGE

BASE / PARENTmeta-models/Muse-Spark-Open-816B-A42BDeclared

base_model

CURRENT RECORDMuse Spark Open 816B-A42B NVFP4Muse Spark Open

TRAINING DISCLOSURE

Training recipeTraining described in model card

Training dataNot disclosed in standard metadata or obvious model card section

FamilyMuse Spark Open

RUNTIME SIGNALS

Compatibility claims stay attached to their evidence level.

Declared and model-card-mentioned runtimes are discovery signals. They are not treated as Open Model Weights runtime tests unless explicitly measured.

Declaredtransformers

MentionedMLX

MentionedSGLang

MentionedTensorRT-LLM

MentionedTransformers

Mentionedllama.cpp

MentionedvLLM

OMW runtime testNot performed

EVIDENCE TRAIL

Sources and observed history.

This is where the article remains auditable: source links on one side, the registry's observed change history on the other.

PrimaryModel Repositoryhttps://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B-NVFP4Inspect source ↗PrimaryModel Apihttps://huggingface.co/api/models/meta-models/Muse-Spark-Open-816B-A42B-NVFP4Inspect source ↗PrimaryModel Cardhttps://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B-NVFP4/blob/main/README.mdInspect source ↗PrimaryConfighttps://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B-NVFP4/blob/main/config.jsonInspect source ↗Primary-or-declaredLicensehttps://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B-NVFP4/blob/main/LICENSE.mdInspect source ↗

2026-10-16

Field-by-field verification

Checked Hugging Face API metadata, exact repository file list, model card and config when accessible.

01 · WEIGHTS

Exact repository artifacts

Weightsverified-available

Accessgated

Repositorymeta-models/Muse-Spark-Open-816B-A42B-NVFP4

Recognized weight files128

Show all 128 exact weight files

HF API file listing ↗

02 · LICENSE

License & commercial use

Declared licenseMuse Model License

License IDmuse-model-license

Commercial useCommercial use is subject to the Muse Model License, Usage Policy, attribution and distribution terms; evaluate deployment and user restrictions individually

Repository license filesLICENSE.md

Classification describes the checked license terms; it is not legal advice.

License / model-card evidence ↗

03 · HARDWARE

Weight-memory estimate

BF16 / FP16~1,632.0 GB

FP8 / INT8~816.0 GB

INT4~408.0 GB

Hypothetical weight-only arithmetic from total logical parameter count at named precision; not measured on-disk checkpoint size, peak VRAM or runnable setup. NVFP4 packed weights need separate artifact-specific accounting.

04 · FORMATS

Formats & precision evidence

Safetensors

BF16: not observedFP16: not observedFP8: not observedINT8: not observedINT4: not observedGGUF: not observed

“Not observed” means no matching repository artifact/name/dtype signal was found; it does not prove no third-party conversion exists.

05 · LINEAGE

Base model & family

FamilyMuse Spark Open

VariantNVFP4

Declared base modelmeta-models/Muse-Spark-Open-816B-A42B

Relationbase_model

06 · TRAINING ASSETS

Recipe & data disclosure

Training recipetraining-described-in-model-card

Data disclosurenot-disclosed-in-standard-metadata-or-obvious-model-card-section

EvaluationsNot classified by automated verifier

Intermediate checkpointsNot classified by automated verifier

07 · RUNTIME SUPPORT

Declared, mentioned and externally evidenced runtimes

Declared librarytransformers

Declared/taggedtransformers

Mentioned in model cardMLX, SGLang, TensorRT-LLM, Transformers, llama.cpp, vLLM

Artifact signalsNone

External primary runtime evidenceNone

Tested by Open Model WeightsNo — source-derived support only

Open Model Weights separates model-repository evidence from external runtime-release evidence. An external support statement does not change the official model repository's weight formats and does not imply an Open Model Weights inference benchmark.

08 · SOURCES

Field evidence

Primary / declared sources5

Repository revision4239e4db1937

Source policyHow evidence is classified →

model_repositoryhttps://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B-NVFP4

model_apihttps://huggingface.co/api/models/meta-models/Muse-Spark-Open-816B-A42B-NVFP4

model_cardhttps://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B-NVFP4/blob/main/README.md

confighttps://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B-NVFP4/blob/main/config.json

licensehttps://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B-NVFP4/blob/main/LICENSE.md

09 · VERIFICATION HISTORY

Checked, not assumed

2026-10-16

Field-by-field verification

Checked Hugging Face API metadata, exact repository file list, model card and config when accessible.

licenseverified

commercial useclassified

contextunknown

weight filesverified

formatsverified

base modeldeclared

training recipetraining-described-in-model-card

data disclosurenot-disclosed-in-standard-metadata-or-obvious-model-card-section

runtime supportsource-derived-not-runtime-tested