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Grok 4.3 vs Muse Spark 1.1

Muse Spark 1.1 leads Grok 4.3 on coding, 70.3 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; 91 benchmarks have a result for both.

Replace Grok 4.3 Replace Muse Spark 1.1
Grok 4.3xAI
Coding
37.4
Overall
53.1
Output $/M
$2.50
2
Muse Spark 1.1Meta
Coding
70.3
Overall
67.0
Output $/M
$4.25
88
vs boards won of 91 shared, 1 tied

Grok 4.3 or Muse Spark 1.1: which to pick

Pick Muse Spark 1.1 for coding: it scores 70.3 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) and a lower cost per solved task ($0.31 against $0.43).

Model AGrok 4.3xAI37.4/1003 independent benchmarks$0.31 per solved taskModel BMuse Spark 1.1Meta70.3/1003 independent benchmarks$0.43 per solved task
Shared results
91
Grok 4.3 only
14
Muse Spark 1.1 only
5
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 1.1 70.3 from 3 benchmarks.
Widest category
Agentic work, 23.1 points apart on average over 14 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Grok 4.3 19.4% against Muse Spark 1.1 72.2%, 52.8 points apart on a 0 to 100 scale.
Output price
Grok 4.3 $2.50 against Muse Spark 1.1 $4.25 per million output tokens, 1.7x apart.
Context window
Grok 4.3 takes 1M tokens, Muse Spark 1.1 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 1.1Ties
Coding0141 tie
Intelligence01
Agentic work014
Reasoning28
Math03
Knowledge010
Web design08
General030
All shared boards2881 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index014
Coding benchmarks for Grok 4.3 and Muse Spark 1.1
BenchmarkGrok 4.3Muse Spark 1.1Leader
LMArena WebDev13581542Muse Spark 1.1
AA Coding Index42.271.3Muse Spark 1.1
LiveCodeBench (Vals AI)84.5%85.9%Muse Spark 1.1
SWE-bench Verified (Vals AI)71.4%82.0%Muse Spark 1.1
Vibe Code Bench (Vals AI)19.4%72.2%Muse Spark 1.1
Code migration (Vals AI)6.8%31.1%Muse Spark 1.1
ProgramBench (Vals AI)0.0%0.0%Tie
Terminal-Bench 2.1 (Vals AI)42.0%69.3%Muse Spark 1.1
SkillsBench (Vals AI)40.6%59.2%Muse Spark 1.1
SciCode48.3%58.8%Muse Spark 1.1
Terminal-Bench Hard (Artificial Analysis run)37.9%Not measuredOnly Grok 4.3 measured
WeirdML49.9%Not measuredOnly Grok 4.3 measured
ALE-Bench944.2Not measuredOnly Grok 4.3 measured
LMArena Text: coding14151498Muse Spark 1.1
LMArena Text: software and IT14161498Muse Spark 1.1
LMArena WebDev: React13531532Muse Spark 1.1
LMArena WebDev: HTML13671540Muse Spark 1.1
LMArena WebDev: from an image13751540Muse Spark 1.1
Neither model has a result on the other 21 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Grok 4.3 and Muse Spark 1.1
BenchmarkGrok 4.3Muse Spark 1.1Leader
AA Intelligence Index24.933.7Muse Spark 1.1
Epoch Capabilities IndexNot measured154.1Only Muse Spark 1.1 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index014
Agentic work benchmarks for Grok 4.3 and Muse Spark 1.1
BenchmarkGrok 4.3Muse Spark 1.1Leader
AA Agentic Index15.525.8Muse Spark 1.1
Design Arena: agents building web apps11261207Muse Spark 1.1
Design Arena: agents building full-stack apps10061199Muse Spark 1.1
Design Arena: agents building mobile apps10581175Muse Spark 1.1
Design Arena: agents building Android apps9621178Muse Spark 1.1
Design Arena: agents building Godot games9141103Muse Spark 1.1
Design Arena: agents building games10071183Muse Spark 1.1
Design Arena: HTML slides9591195Muse Spark 1.1
Design Arena: PowerPoint slides9881155Muse Spark 1.1
Design Arena: spreadsheets8791042Muse Spark 1.1
Finance Agent (Vals AI)37.7%57.2%Muse Spark 1.1
Tax Agent Bench (Vals AI)6.2%Not measuredOnly Grok 4.3 measured
Legal Research Bench (Vals AI)15.4%38.0%Muse Spark 1.1
Excel Modeling Benchmark (Vals AI)18.4%56.4%Muse Spark 1.1
Time Horizon Index (Vals AI)Not measured1.7%Only Muse Spark 1.1 measured
τ²-Bench Telecom97.7%Not measuredOnly Grok 4.3 measured
APEX-AgentsNot measured31.8%Only Muse Spark 1.1 measured
Vending-Bench 2$35$6,520Muse Spark 1.1
LMArena Search1166Not measuredOnly Grok 4.3 measured
Neither model has a result on the other 22 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index28
Reasoning benchmarks for Grok 4.3 and Muse Spark 1.1
BenchmarkGrok 4.3Muse Spark 1.1Leader
GPQA Diamond91.4%91.2%Grok 4.3
MMMU Pro (Vals AI)83.1%86.6%Muse Spark 1.1
GPQA Diamond (Artificial Analysis run)90.1%89.8%Grok 4.3
Humanity's Last Exam (Artificial Analysis run)37.2%46.2%Muse Spark 1.1
GPQA Diamond (Epoch AI run)88.8%Not measuredOnly Grok 4.3 measured
Chess puzzles18.0%34.0%Muse Spark 1.1
LMArena Text: hard prompts13961485Muse Spark 1.1
LMArena Text: expert13841478Muse Spark 1.1
LMArena Text: hard prompts in English14021480Muse Spark 1.1
LMArena Vision: diagrams12411305Muse Spark 1.1
LMArena Vision: homework12411287Muse Spark 1.1
Neither model has a result on the other 11 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index03
Math benchmarks for Grok 4.3 and Muse Spark 1.1
BenchmarkGrok 4.3Muse Spark 1.1Leader
OTIS Mock AIME93.3%Not measuredOnly Grok 4.3 measured
FrontierMath, tiers 1 to 342.8%Not measuredOnly Grok 4.3 measured
FrontierMath, tier 414.6%Not measuredOnly Grok 4.3 measured
ProofBench11.0%39.0%Muse Spark 1.1
LMArena Text: math13871482Muse Spark 1.1
LMArena Text: mathematical work13961487Muse Spark 1.1
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index010
Knowledge benchmarks for Grok 4.3 and Muse Spark 1.1
BenchmarkGrok 4.3Muse Spark 1.1Leader
MMLU Pro85.8%88.7%Muse Spark 1.1
LegalBench (Vals AI)84.5%85.0%Muse Spark 1.1
CaseLaw (Vals AI)79.3%Not measuredOnly Grok 4.3 measured
CorpFin (Vals AI)68.5%71.3%Muse Spark 1.1
TaxEval (Vals AI)70.8%79.7%Muse Spark 1.1
MortgageTax (Vals AI)48.3%66.1%Muse Spark 1.1
MedCode (Vals AI)38.1%Not measuredOnly Grok 4.3 measured
SimpleQA Verified33.2%57.8%Muse Spark 1.1
LMArena Text: science13991484Muse Spark 1.1
LMArena Text: medicine and healthcare13841479Muse Spark 1.1
LMArena Text: legal and government13861481Muse Spark 1.1
LMArena Text: business and finance13811470Muse Spark 1.1
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 1.1
BenchmarkGrok 4.3Muse Spark 1.1Leader
Design Arena: websites11961270Muse Spark 1.1
Design Arena: UI components11901289Muse Spark 1.1
Design Arena: game dev11731269Muse Spark 1.1
Design Arena: data viz11791268Muse Spark 1.1
Design Arena: 3D11241260Muse Spark 1.1
Design Arena: all code categories11861276Muse Spark 1.1
Design Arena: SVG10801235Muse Spark 1.1
Design Arena: ASCII art11251271Muse Spark 1.1
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index030
General benchmarks for Grok 4.3 and Muse Spark 1.1
BenchmarkGrok 4.3Muse Spark 1.1Leader
Public Benefits Bench (Vals AI)51.7%61.3%Muse Spark 1.1
SAGE (Vals AI)19.7%45.6%Muse Spark 1.1
MedScribe (Vals AI)74.4%88.9%Muse Spark 1.1
Vals Multimodal Index43.3%66.7%Muse Spark 1.1
IFBench83.3%Not measuredOnly Grok 4.3 measured
Long context reasoning (AA-LCR)75.0%77.7%Muse Spark 1.1
DTBench90.7%94.4%Muse Spark 1.1
LMCA38.3%49.9%Muse Spark 1.1
Surface Evolver BenchNot measured52.5%Only Muse Spark 1.1 measured
LMArena Text13971478Muse Spark 1.1
LMArena Text: instruction following13661457Muse Spark 1.1
LMArena Text: creative writing13801435Muse Spark 1.1
LMArena Vision12291293Muse Spark 1.1
LMArena Text: English14041478Muse Spark 1.1
LMArena Text: non-English13851471Muse Spark 1.1
LMArena Text: Chinese14221515Muse Spark 1.1
LMArena Text: German13951469Muse Spark 1.1
LMArena Text: Japanese13791450Muse Spark 1.1
LMArena Text: Korean13541459Muse Spark 1.1
LMArena Text: French14111492Muse Spark 1.1
LMArena Text: Spanish13991464Muse Spark 1.1
LMArena Text: Russian13991482Muse Spark 1.1
LMArena Text: Polish13981499Muse Spark 1.1
LMArena Text: multi-turn14061484Muse Spark 1.1
LMArena Text: longer queries13931462Muse Spark 1.1
LMArena Text: writing and language13851448Muse Spark 1.1
LMArena Text: entertainment and media13701438Muse Spark 1.1
LMArena Vision: English12351292Muse Spark 1.1
LMArena Vision: Chinese12571348Muse Spark 1.1
LMArena Vision: reading text12351301Muse Spark 1.1
LMArena Vision: humor12221288Muse Spark 1.1
LMArena Vision: recognizing things1217Not measuredOnly Grok 4.3 measured
LMArena Vision: creative writing12371253Muse Spark 1.1
LMArena DocumentNot measured1465Only Muse Spark 1.1 measured
Neither model has a result on the other 12 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 1.1
BenchmarkGrok 4.3Muse Spark 1.1Leader
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 1.1$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 1.1$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 1.1$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 1.1
SpecificationSpaceXAI Grok 4.3Meta Muse Spark 1.1
MakerxAIMeta
WeightsNo public weights listedNo public weights listed
ReleasedApril 30, 2026July 16, 2026
Context window1M1.05M
Input $/Mtok$1.25$1.25
Output $/Mtok$2.50$4.25
Coding index37.470.3
Independent measurements behind it33
Cost per solved task$0.31$0.43
SourceOpenRouter listingOpenRouter listing

Questions

Is Grok 4.3 better than Muse Spark 1.1 for coding?

Pick Muse Spark 1.1 for coding: it scores 70.3 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) and a lower cost per solved task ($0.31 against $0.43).

Which is cheaper, Grok 4.3 or Muse Spark 1.1?

Grok 4.3 costs $1.25 per million input tokens and $2.50 per million output tokens; Muse Spark 1.1 costs $1.25 and $4.25. Per solved SWE-bench Verified task, Grok 4.3 costs $0.31 and Muse Spark 1.1 $0.43.

Which has the bigger context window, Grok 4.3 or Muse Spark 1.1?

Muse Spark 1.1, with 1.05M tokens against 1M.

How many benchmarks is the Grok 4.3 vs Muse Spark 1.1 comparison based on?

91 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 1.1's on 3. Where only one model has a result, the page says so instead of naming a winner.

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<iframe src="https://llmbenchmark.ai/embed/compare/grok-4-3-vs-meta-muse-spark-1-1" title="Grok 4.3 vs Muse Spark 1.1, LLMBenchmark.ai" width="100%" height="360" style="border:0;max-width:100%" loading="lazy"></iframe>
<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-1-1">LLMBenchmark.ai, Grok 4.3 vs Muse Spark 1.1</a></p>