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Grok 4.3 vs Muse Spark 1.2

Muse Spark 1.2 leads Grok 4.3 on coding, 55.7 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; 81 benchmarks have a result for both.

Replace Grok 4.3 Replace Muse Spark 1.2
Grok 4.3xAI
Coding
37.4
Overall
53.1
Output $/M
$2.50
0
Muse Spark 1.2Meta
Coding
55.7
Overall
60.4
Output $/M
$4.25
81
vs boards won of 81 shared

Grok 4.3 or Muse Spark 1.2: which to pick

Pick Muse Spark 1.2 for coding: it scores 55.7 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 $0.64).

Model AGrok 4.3xAI37.4/1003 independent benchmarks$0.31 per solved taskModel BMuse Spark 1.2Meta55.7/1005 independent benchmarks$0.64 per solved task
Shared results
81
Grok 4.3 only
24
Muse Spark 1.2 only
16
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 1.2 55.7 from 5 benchmarks.
Widest category
Agentic work, 24.1 points apart on average over 12 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Grok 4.3 19.4% against Muse Spark 1.2 79.1%, 59.7 points apart on a 0 to 100 scale.
Output price
Grok 4.3 $2.50 against Muse Spark 1.2 $4.25 per million output tokens, 1.7x apart.
Context window
Grok 4.3 takes 1M tokens, Muse Spark 1.2 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 1.2Ties
Coding014
Intelligence01
Agentic work012
Reasoning08
Math03
Knowledge011
Web design08
General024
All shared boards081
CodingLike-for-likeSix of these boards feed the Vibe Coding Index014
Coding benchmarks for Grok 4.3 and Muse Spark 1.2
BenchmarkGrok 4.3Muse Spark 1.2Leader
LiveBench codingNot measured78.2%Only Muse Spark 1.2 measured
LMArena WebDev13581534Muse Spark 1.2
AA Coding Index42.272.2Muse Spark 1.2
LiveCodeBench (Vals AI)84.5%Not measuredOnly Grok 4.3 measured
SWE-bench Verified (Vals AI)71.4%86.6%Muse Spark 1.2
Terminal-Bench 4 (Vals AI)Not measured6.1%Only Muse Spark 1.2 measured
Vibe Code Bench (Vals AI)19.4%79.1%Muse Spark 1.2
Code migration (Vals AI)6.8%29.9%Muse Spark 1.2
ProgramBench (Vals AI)0.0%0.5%Muse Spark 1.2
IOI (Vals AI)Not measured21.8%Only Muse Spark 1.2 measured
Terminal-Bench 2.1 (Vals AI)42.0%69.7%Muse Spark 1.2
SkillsBench (Vals AI)40.6%53.0%Muse Spark 1.2
CyberBench (Vals AI)Not measured69.5%Only Muse Spark 1.2 measured
SciCode48.3%57.4%Muse Spark 1.2
Terminal-Bench Hard (Artificial Analysis run)37.9%Not measuredOnly Grok 4.3 measured
FrontierSWENot measured12.0%Only Muse Spark 1.2 measured
WeirdML49.9%60.3%Muse Spark 1.2
ALE-Bench944.2Not measuredOnly Grok 4.3 measured
LMArena Text: coding14151505Muse Spark 1.2
LMArena Text: software and IT14161505Muse Spark 1.2
LMArena WebDev: React13531526Muse Spark 1.2
LMArena WebDev: HTML13671543Muse Spark 1.2
LMArena WebDev: from an image1375Not measuredOnly Grok 4.3 measured
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 1.2
BenchmarkGrok 4.3Muse Spark 1.2Leader
AA Intelligence Index24.939.6Muse Spark 1.2
Epoch Capabilities IndexNot measured155.1Only Muse Spark 1.2 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index012
Agentic work benchmarks for Grok 4.3 and Muse Spark 1.2
BenchmarkGrok 4.3Muse Spark 1.2Leader
AA Agentic Index15.543.2Muse Spark 1.2
Design Arena: agents building web apps11261221Muse Spark 1.2
Design Arena: agents building full-stack apps10061210Muse Spark 1.2
Design Arena: agents building mobile apps10581181Muse Spark 1.2
Design Arena: agents building Android apps9621222Muse Spark 1.2
Design Arena: agents building Godot games914Not measuredOnly Grok 4.3 measured
Design Arena: agents building games10071179Muse Spark 1.2
Design Arena: HTML slides9591085Muse Spark 1.2
Design Arena: PowerPoint slides9881172Muse Spark 1.2
Design Arena: spreadsheets879Not measuredOnly Grok 4.3 measured
LiveBench researchNot measured67.7%Only Muse Spark 1.2 measured
LiveBench browserNot measured36.0%Only Muse Spark 1.2 measured
LiveBench long agenticNot measured21.3%Only Muse Spark 1.2 measured
SREBench (Vals AI)Not measured0.0%Only Muse Spark 1.2 measured
Finance Agent (Vals AI)37.7%60.6%Muse Spark 1.2
Tax Agent Bench (Vals AI)6.2%32.8%Muse Spark 1.2
Legal Research Bench (Vals AI)15.4%43.8%Muse Spark 1.2
Excel Modeling Benchmark (Vals AI)18.4%57.0%Muse Spark 1.2
BioMysteryBench (Vals AI)Not measured64.8%Only Muse Spark 1.2 measured
τ²-Bench Telecom97.7%Not measuredOnly Grok 4.3 measured
APEX-AgentsNot measured45.4%Only Muse Spark 1.2 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 18 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index08
Reasoning benchmarks for Grok 4.3 and Muse Spark 1.2
BenchmarkGrok 4.3Muse Spark 1.2Leader
GPQA Diamond91.4%Not measuredOnly Grok 4.3 measured
LiveBench reasoningNot measured90.0%Only Muse Spark 1.2 measured
MMMU Pro (Vals AI)83.1%86.1%Muse Spark 1.2
GPQA Diamond (Artificial Analysis run)90.1%90.4%Muse Spark 1.2
Humanity's Last Exam (Artificial Analysis run)37.2%45.5%Muse Spark 1.2
GPQA Diamond (Epoch AI run)88.8%Not measuredOnly Grok 4.3 measured
SimpleBenchNot measured74.5%Only Muse Spark 1.2 measured
Chess puzzles18.0%27.0%Muse Spark 1.2
LMArena Text: hard prompts13961489Muse Spark 1.2
LMArena Text: expert13841475Muse Spark 1.2
LMArena Text: hard prompts in English14021487Muse Spark 1.2
LMArena Vision: diagrams12411317Muse Spark 1.2
LMArena Vision: homework1241Not measuredOnly Grok 4.3 measured
Neither model has a result on the other 9 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index03
Math benchmarks for Grok 4.3 and Muse Spark 1.2
BenchmarkGrok 4.3Muse Spark 1.2Leader
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%43.0%Muse Spark 1.2
LMArena Text: math13871484Muse Spark 1.2
LMArena Text: mathematical work13961480Muse Spark 1.2
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index011
Knowledge benchmarks for Grok 4.3 and Muse Spark 1.2
BenchmarkGrok 4.3Muse Spark 1.2Leader
MMLU Pro85.8%88.3%Muse Spark 1.2
LegalBench (Vals AI)84.5%85.3%Muse Spark 1.2
CaseLaw (Vals AI)79.3%Not measuredOnly Grok 4.3 measured
CorpFin (Vals AI)68.5%70.9%Muse Spark 1.2
TaxEval (Vals AI)70.8%80.4%Muse Spark 1.2
MortgageTax (Vals AI)48.3%65.4%Muse Spark 1.2
MedCode (Vals AI)38.1%49.4%Muse Spark 1.2
SimpleQA Verified33.2%60.3%Muse Spark 1.2
LMArena Text: science13991500Muse Spark 1.2
LMArena Text: medicine and healthcare13841496Muse Spark 1.2
LMArena Text: legal and government13861517Muse Spark 1.2
LMArena Text: business and finance13811484Muse Spark 1.2
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 1.2
BenchmarkGrok 4.3Muse Spark 1.2Leader
Design Arena: websites11961312Muse Spark 1.2
Design Arena: UI components11901298Muse Spark 1.2
Design Arena: game dev11731301Muse Spark 1.2
Design Arena: data viz11791334Muse Spark 1.2
Design Arena: 3D11241301Muse Spark 1.2
Design Arena: all code categories11861312Muse Spark 1.2
Design Arena: SVG10801284Muse Spark 1.2
Design Arena: ASCII art11251284Muse Spark 1.2
LiveBench designNot measured67.1%Only Muse Spark 1.2 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index024
General benchmarks for Grok 4.3 and Muse Spark 1.2
BenchmarkGrok 4.3Muse Spark 1.2Leader
LiveBench data analysisNot measured76.5%Only Muse Spark 1.2 measured
Public Benefits Bench (Vals AI)51.7%68.5%Muse Spark 1.2
SAGE (Vals AI)19.7%47.7%Muse Spark 1.2
MedScribe (Vals AI)74.4%90.1%Muse Spark 1.2
Vals Multimodal Index43.3%69.8%Muse Spark 1.2
IFBench83.3%Not measuredOnly Grok 4.3 measured
Long context reasoning (AA-LCR)75.0%79.0%Muse Spark 1.2
DTBench90.7%94.7%Muse Spark 1.2
LMCA38.3%48.4%Muse Spark 1.2
LMArena Text13971482Muse Spark 1.2
LMArena Text: instruction following13661462Muse Spark 1.2
LMArena Text: creative writing13801436Muse Spark 1.2
LMArena Vision12291304Muse Spark 1.2
LMArena Text: English14041483Muse Spark 1.2
LMArena Text: non-English13851476Muse Spark 1.2
LMArena Text: Chinese14221509Muse Spark 1.2
LMArena Text: German1395Not measuredOnly Grok 4.3 measured
LMArena Text: Japanese1379Not measuredOnly Grok 4.3 measured
LMArena Text: Korean13541462Muse Spark 1.2
LMArena Text: French14111495Muse Spark 1.2
LMArena Text: Spanish13991484Muse Spark 1.2
LMArena Text: Russian13991483Muse Spark 1.2
LMArena Text: Polish1398Not measuredOnly Grok 4.3 measured
LMArena Text: multi-turn14061502Muse Spark 1.2
LMArena Text: longer queries13931473Muse Spark 1.2
LMArena Text: writing and language13851453Muse Spark 1.2
LMArena Text: entertainment and media13701443Muse Spark 1.2
LMArena Vision: English12351291Muse Spark 1.2
LMArena Vision: Chinese1257Not measuredOnly Grok 4.3 measured
LMArena Vision: reading text12351313Muse Spark 1.2
LMArena Vision: humor1222Not measuredOnly Grok 4.3 measured
LMArena Vision: recognizing things1217Not measuredOnly Grok 4.3 measured
LMArena Vision: creative writing1237Not measuredOnly Grok 4.3 measured
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 1.2
BenchmarkGrok 4.3Muse Spark 1.2Leader
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 1.2$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 1.2$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 1.2$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 1.2
SpecificationSpaceXAI Grok 4.3Meta Muse Spark 1.2
MakerxAIMeta
WeightsNo public weights listedNo public weights listed
ReleasedApril 30, 2026August 5, 2026
Context window1M1.05M
Input $/Mtok$1.25$1.25
Output $/Mtok$2.50$4.25
Coding index37.455.7
Independent measurements behind it35
Cost per solved task$0.31$0.64
SourceOpenRouter listingOpenRouter listing

Questions

Is Grok 4.3 better than Muse Spark 1.2 for coding?

Pick Muse Spark 1.2 for coding: it scores 55.7 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 $0.64).

Which is cheaper, Grok 4.3 or Muse Spark 1.2?

Grok 4.3 costs $1.25 per million input tokens and $2.50 per million output tokens; Muse Spark 1.2 costs $1.25 and $4.25. Per solved SWE-bench Verified task, Grok 4.3 costs $0.31 and Muse Spark 1.2 $0.64.

Which has the bigger context window, Grok 4.3 or Muse Spark 1.2?

Muse Spark 1.2, with 1.05M tokens against 1M.

How many benchmarks is the Grok 4.3 vs Muse Spark 1.2 comparison based on?

81 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 1.2's on 5. 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-1-2">LLMBenchmark.ai, Grok 4.3 vs Muse Spark 1.2</a></p>