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Grok 4.3 vs Muse Spark 1.3

Muse Spark 1.3 leads Grok 4.3 on coding, 57.4 to 37.4 on the Vibe Coding Index, and Grok 4.3 costs 1.7x less per output token ($2.50 vs $4.25 per million). Updated October 22, 2026; 77 benchmarks have a result for both.

Replace Grok 4.3 Replace Muse Spark 1.3
Grok 4.3xAI
Coding
37.4
Overall
53.1
Output $/M
$2.50
0
Muse Spark 1.3Meta
Coding
57.4
Overall
68.6
Output $/M
$4.25
77
vs boards won of 77 shared

Grok 4.3 or Muse Spark 1.3: which to pick

Pick Muse Spark 1.3 for coding: it scores 57.4 on the Vibe Coding Index against 37.4 for Grok 4.3.

Pick Grok 4.3 for output tokens 1.7x cheaper ($2.50 vs $4.25 per million).

Model AGrok 4.3xAI37.4/1003 independent benchmarks$0.31 per solved taskModel BMuse Spark 1.3Meta57.4/1004 independent benchmarksNo cost per solved task
Shared results
77
Grok 4.3 only
28
Muse Spark 1.3 only
15
Like-for-like categories
8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Grok 4.3 37.4 from 3 benchmarks, Muse Spark 1.3 57.4 from 4 benchmarks.
Widest category
Agentic work, 30.1 points apart on average over 11 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Grok 4.3 19.4% against Muse Spark 1.3 82.9%, 63.5 points apart on a 0 to 100 scale.
Output price
Grok 4.3 $2.50 against Muse Spark 1.3 $4.25 per million output tokens, 1.7x apart.
Context window
Grok 4.3 takes 1M tokens, Muse Spark 1.3 1.05M.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryGrok 4.3BarsMuse Spark 1.3Ties
Coding013
Intelligence01
Agentic work011
Reasoning08
Math06
Knowledge04
Web design08
General026
All shared boards077
CodingLike-for-likeSix of these boards feed the Vibe Coding Index013
Coding benchmarks for Grok 4.3 and Muse Spark 1.3
BenchmarkGrok 4.3Muse Spark 1.3Leader
LiveBench codingNot measured90.2%Only Muse Spark 1.3 measured
LMArena WebDev13581659Muse Spark 1.3
AA Coding Index42.275.8Muse Spark 1.3
LiveCodeBench (Vals AI)84.5%Not measuredOnly Grok 4.3 measured
SWE-bench Verified (Vals AI)71.4%Not measuredOnly Grok 4.3 measured
Terminal-Bench 4 (Vals AI)Not measured10.6%Only Muse Spark 1.3 measured
Vibe Code Bench (Vals AI)19.4%82.9%Muse Spark 1.3
Code migration (Vals AI)6.8%27.6%Muse Spark 1.3
ProgramBench (Vals AI)0.0%0.5%Muse Spark 1.3
IOI (Vals AI)Not measured43.9%Only Muse Spark 1.3 measured
Terminal-Bench 2.1 (Vals AI)42.0%72.3%Muse Spark 1.3
SkillsBench (Vals AI)40.6%Not measuredOnly Grok 4.3 measured
CyberBench (Vals AI)Not measured69.4%Only Muse Spark 1.3 measured
SciCode48.3%59.7%Muse Spark 1.3
Terminal-Bench Hard (Artificial Analysis run)37.9%Not measuredOnly Grok 4.3 measured
FrontierSWENot measured25.8%Only Muse Spark 1.3 measured
WeirdML49.9%Not measuredOnly Grok 4.3 measured
ALE-Bench944.21688.3Muse Spark 1.3
LMArena Text: coding14151510Muse Spark 1.3
LMArena Text: software and IT14161511Muse Spark 1.3
LMArena WebDev: React13531672Muse Spark 1.3
LMArena WebDev: HTML13671653Muse Spark 1.3
LMArena WebDev: from an image13751640Muse Spark 1.3
Neither model has a result on the other 16 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Grok 4.3 and Muse Spark 1.3
BenchmarkGrok 4.3Muse Spark 1.3Leader
AA Intelligence Index24.948.1Muse Spark 1.3
Epoch Capabilities IndexNot measured157.2Only Muse Spark 1.3 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index011
Agentic work benchmarks for Grok 4.3 and Muse Spark 1.3
BenchmarkGrok 4.3Muse Spark 1.3Leader
AA Agentic Index15.555.5Muse Spark 1.3
Design Arena: agents building web apps11261297Muse Spark 1.3
Design Arena: agents building full-stack apps10061295Muse Spark 1.3
Design Arena: agents building mobile apps10581218Muse Spark 1.3
Design Arena: agents building Android apps962Not measuredOnly Grok 4.3 measured
Design Arena: agents building Godot games9141241Muse Spark 1.3
Design Arena: agents building games1007Not measuredOnly Grok 4.3 measured
Design Arena: HTML slides959Not measuredOnly Grok 4.3 measured
Design Arena: PowerPoint slides9881219Muse Spark 1.3
Design Arena: spreadsheets8791062Muse Spark 1.3
LiveBench researchNot measured68.6%Only Muse Spark 1.3 measured
LiveBench browserNot measured80.0%Only Muse Spark 1.3 measured
LiveBench long agenticNot measured40.4%Only Muse Spark 1.3 measured
Finance Agent (Vals AI)37.7%58.9%Muse Spark 1.3
Tax Agent Bench (Vals AI)6.2%36.0%Muse Spark 1.3
Legal Research Bench (Vals AI)15.4%40.9%Muse Spark 1.3
Excel Modeling Benchmark (Vals AI)18.4%62.7%Muse Spark 1.3
Terminal-Bench-Science (Vals AI)Not measured4.3%Only Muse Spark 1.3 measured
τ²-Bench Telecom97.7%Not measuredOnly Grok 4.3 measured
APEX-AgentsNot measured58.6%Only Muse Spark 1.3 measured
Vending-Bench 2$35Not measuredOnly Grok 4.3 measured
LMArena Search1166Not measuredOnly Grok 4.3 measured
Neither model has a result on the other 19 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index08
Reasoning benchmarks for Grok 4.3 and Muse Spark 1.3
BenchmarkGrok 4.3Muse Spark 1.3Leader
GPQA Diamond91.4%Not measuredOnly Grok 4.3 measured
LiveBench reasoningNot measured89.7%Only Muse Spark 1.3 measured
MMMU Pro (Vals AI)83.1%Not measuredOnly Grok 4.3 measured
GPQA Diamond (Artificial Analysis run)90.1%94.1%Muse Spark 1.3
Humanity's Last Exam (Artificial Analysis run)37.2%48.7%Muse Spark 1.3
GPQA Diamond (Epoch AI run)88.8%Not measuredOnly Grok 4.3 measured
Chess puzzles18.0%37.0%Muse Spark 1.3
Mystery game puzzlesNot measured25.0%Only Muse Spark 1.3 measured
LMArena Text: hard prompts13961503Muse Spark 1.3
LMArena Text: expert13841519Muse Spark 1.3
LMArena Text: hard prompts in English14021500Muse Spark 1.3
LMArena Vision: diagrams12411330Muse Spark 1.3
LMArena Vision: homework12411296Muse Spark 1.3
Neither model has a result on the other 9 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for Grok 4.3 and Muse Spark 1.3
BenchmarkGrok 4.3Muse Spark 1.3Leader
OTIS Mock AIME93.3%99.2%Muse Spark 1.3
FrontierMath, tiers 1 to 342.8%74.4%Muse Spark 1.3
FrontierMath, tier 414.6%46.3%Muse Spark 1.3
ProofBench11.0%58.0%Muse Spark 1.3
LMArena Text: math13871497Muse Spark 1.3
LMArena Text: mathematical work13961491Muse Spark 1.3
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index04
Knowledge benchmarks for Grok 4.3 and Muse Spark 1.3
BenchmarkGrok 4.3Muse Spark 1.3Leader
MMLU Pro85.8%Not measuredOnly Grok 4.3 measured
LegalBench (Vals AI)84.5%Not measuredOnly Grok 4.3 measured
CaseLaw (Vals AI)79.3%Not measuredOnly Grok 4.3 measured
CorpFin (Vals AI)68.5%Not measuredOnly Grok 4.3 measured
TaxEval (Vals AI)70.8%Not measuredOnly Grok 4.3 measured
MortgageTax (Vals AI)48.3%Not measuredOnly Grok 4.3 measured
MedCode (Vals AI)38.1%Not measuredOnly Grok 4.3 measured
SimpleQA Verified33.2%Not measuredOnly Grok 4.3 measured
LMArena Text: science13991507Muse Spark 1.3
LMArena Text: medicine and healthcare13841493Muse Spark 1.3
LMArena Text: legal and government13861499Muse Spark 1.3
LMArena Text: business and finance13811490Muse Spark 1.3
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index08
Web design benchmarks for Grok 4.3 and Muse Spark 1.3
BenchmarkGrok 4.3Muse Spark 1.3Leader
Design Arena: websites11961356Muse Spark 1.3
Design Arena: UI components11901349Muse Spark 1.3
Design Arena: game dev11731328Muse Spark 1.3
Design Arena: data viz11791343Muse Spark 1.3
Design Arena: 3D11241358Muse Spark 1.3
Design Arena: all code categories11861352Muse Spark 1.3
Design Arena: SVG10801301Muse Spark 1.3
Design Arena: ASCII art11251278Muse Spark 1.3
LiveBench designNot measured74.8%Only Muse Spark 1.3 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index026
General benchmarks for Grok 4.3 and Muse Spark 1.3
BenchmarkGrok 4.3Muse Spark 1.3Leader
LiveBench data analysisNot measured79.6%Only Muse Spark 1.3 measured
Public Benefits Bench (Vals AI)51.7%Not measuredOnly Grok 4.3 measured
SAGE (Vals AI)19.7%Not measuredOnly Grok 4.3 measured
MedScribe (Vals AI)74.4%Not measuredOnly Grok 4.3 measured
Vals Multimodal Index43.3%Not measuredOnly Grok 4.3 measured
IFBench83.3%Not measuredOnly Grok 4.3 measured
Long context reasoning (AA-LCR)75.0%83.0%Muse Spark 1.3
DTBench90.7%96.5%Muse Spark 1.3
LMCA38.3%53.9%Muse Spark 1.3
LMArena Text13971490Muse Spark 1.3
LMArena Text: instruction following13661479Muse Spark 1.3
LMArena Text: creative writing13801462Muse Spark 1.3
LMArena Vision12291308Muse Spark 1.3
LMArena Text: English14041495Muse Spark 1.3
LMArena Text: non-English13851481Muse Spark 1.3
LMArena Text: Chinese14221532Muse Spark 1.3
LMArena Text: German13951513Muse Spark 1.3
LMArena Text: Japanese13791470Muse Spark 1.3
LMArena Text: Korean13541490Muse Spark 1.3
LMArena Text: French14111511Muse Spark 1.3
LMArena Text: Spanish13991496Muse Spark 1.3
LMArena Text: Russian13991491Muse Spark 1.3
LMArena Text: Polish13981490Muse Spark 1.3
LMArena Text: multi-turn14061487Muse Spark 1.3
LMArena Text: longer queries13931488Muse Spark 1.3
LMArena Text: writing and language13851470Muse Spark 1.3
LMArena Text: entertainment and media13701457Muse Spark 1.3
LMArena Vision: English12351298Muse Spark 1.3
LMArena Vision: Chinese12571384Muse Spark 1.3
LMArena Vision: reading text12351319Muse Spark 1.3
LMArena Vision: humor12221293Muse Spark 1.3
LMArena Vision: recognizing things1217Not measuredOnly Grok 4.3 measured
LMArena Vision: creative writing12371296Muse Spark 1.3
Neither model has a result on the other 13 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Grok 4.3 and Muse Spark 1.3
BenchmarkGrok 4.3Muse Spark 1.3Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Grok 4.3$0.0025Fits in one request
Muse Spark 1.3$0.0034Fits in one request

Grok 4.3 costs less

Repository review

50K input + 3K output tokens

Grok 4.3$0.070Fits in one request
Muse Spark 1.3$0.075Fits in one request

Grok 4.3 costs less

Agent loop

200K input + 10K output tokens

Grok 4.3$0.275Fits in one request
Muse Spark 1.3$0.292Fits in one request

Grok 4.3 costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Grok 4.3 and Muse Spark 1.3
SpecificationSpaceXAI Grok 4.3Meta Muse Spark 1.3
MakerxAIMeta
WeightsNo public weights listedNo public weights listed
ReleasedApril 30, 2026September 2, 2026
Context window1M1.05M
Input $/Mtok$1.25$1.25
Output $/Mtok$2.50$4.25
Coding index37.457.4
Independent measurements behind it34
Cost per solved task$0.31Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Grok 4.3 better than Muse Spark 1.3 for coding?

Pick Muse Spark 1.3 for coding: it scores 57.4 on the Vibe Coding Index against 37.4 for Grok 4.3. Pick Grok 4.3 for output tokens 1.7x cheaper ($2.50 vs $4.25 per million).

Which is cheaper, Grok 4.3 or Muse Spark 1.3?

Grok 4.3 costs $1.25 per million input tokens and $2.50 per million output tokens; Muse Spark 1.3 costs $1.25 and $4.25. Cost per solved task is known for Grok 4.3 only.

Which has the bigger context window, Grok 4.3 or Muse Spark 1.3?

Muse Spark 1.3, with 1.05M tokens against 1M.

How many benchmarks is the Grok 4.3 vs Muse Spark 1.3 comparison based on?

77 benchmarks have a result for both models as of October 22, 2026. Grok 4.3's coding index rests on 3 independent benchmarks and Muse Spark 1.3's on 4. Where only one model has a result, the page says so instead of naming a winner.

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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/grok-4-3-vs-meta-muse-spark-1-3">LLMBenchmark.ai, Grok 4.3 vs Muse Spark 1.3</a></p>