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Grok 4.5 vs Muse Spark 1.3

Grok 4.5 leads Muse Spark 1.3 on coding, 58.6 to 57.4 on the Vibe Coding Index, and Muse Spark 1.3 costs 1.4x less per output token ($4.25 vs $6.00 per million). Updated October 22, 2026; 88 benchmarks have a result for both.

Replace Grok 4.5 Replace Muse Spark 1.3
Grok 4.5xAI
Coding
58.6
Overall
62.1
Output $/M
$6.00
7
Muse Spark 1.3Meta
Coding
57.4
Overall
68.6
Output $/M
$4.25
80
vs boards won of 88 shared, 1 tied

Grok 4.5 or Muse Spark 1.3: which to pick

Grok 4.5 and Muse Spark 1.3 are level for coding, 58.6 against 57.4 on the Vibe Coding Index, so price and context decide.

Pick Muse Spark 1.3 for output tokens 1.4x cheaper ($4.25 vs $6.00 per million) and a larger context window (1.05M against 500K tokens). Pick Grok 4.5 for work measured by LiveBench coding or Code migration (Vals AI), where it leads.

Model AGrok 4.5xAI58.6/1006 independent benchmarks$0.62 per solved taskModel BMuse Spark 1.3Meta57.4/1004 independent benchmarksNo cost per solved task
Shared results
88
Grok 4.5 only
35
Muse Spark 1.3 only
4
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 4.5 58.6 from 6 benchmarks, Muse Spark 1.3 57.4 from 4 benchmarks.
Widest category
Math, 12.6 points apart on average over 6 shared benchmarks.
Widest single gap
LiveBench browser: Grok 4.5 44.0% against Muse Spark 1.3 80.0%, 36.0 points apart on a 0 to 100 scale.
Output price
Grok 4.5 $6.00 against Muse Spark 1.3 $4.25 per million output tokens, 1.4x apart.
Context window
Grok 4.5 takes 500K 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 4.5BarsMuse Spark 1.3Ties
Coding314
Intelligence02
Agentic work311
Reasoning09
Math06
Knowledge04
Web design18
General0261 tie
All shared boards7801 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index314
Coding benchmarks for Grok 4.5 and Muse Spark 1.3
BenchmarkGrok 4.5Muse Spark 1.3Leader
LiveBench coding94.3%90.2%Grok 4.5
LMArena WebDev15531659Muse Spark 1.3
AA Coding Index72.475.8Muse Spark 1.3
LiveCodeBench (Vals AI)87.3%Not measuredOnly Grok 4.5 measured
SWE-bench Verified (Vals AI)86.6%Not measuredOnly Grok 4.5 measured
Terminal-Bench 4 (Vals AI)8.6%10.6%Muse Spark 1.3
Vibe Code Bench (Vals AI)69.0%82.9%Muse Spark 1.3
Code migration (Vals AI)36.6%27.6%Grok 4.5
ProgramBench (Vals AI)0.0%0.5%Muse Spark 1.3
IOI (Vals AI)40.6%43.9%Muse Spark 1.3
Terminal-Bench 2.1 (Vals AI)67.8%72.3%Muse Spark 1.3
SkillsBench (Vals AI)66.0%Not measuredOnly Grok 4.5 measured
CyberBench (Vals AI)71.0%69.4%Grok 4.5
SciCode55.0%59.7%Muse Spark 1.3
FrontierCode42.4%Not measuredOnly Grok 4.5 measured
FrontierSWENot measured25.8%Only Muse Spark 1.3 measured
WeirdML46.4%Not measuredOnly Grok 4.5 measured
ALE-Bench1309.31688.3Muse Spark 1.3
LMArena Text: coding14741510Muse Spark 1.3
LMArena Text: software and IT14711511Muse Spark 1.3
LMArena WebDev: React15561672Muse Spark 1.3
LMArena WebDev: HTML15671653Muse Spark 1.3
LMArena WebDev: from an image15621640Muse Spark 1.3
SciCode6.5%Not measuredOnly Grok 4.5 measured
Neither model has a result on the other 15 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Grok 4.5 and Muse Spark 1.3
BenchmarkGrok 4.5Muse Spark 1.3Leader
AA Intelligence Index38.848.1Muse Spark 1.3
Epoch Capabilities Index154.1157.2Muse Spark 1.3
Agentic workLike-for-likePublic boards, shown as published, kept out of the index311
Agentic work benchmarks for Grok 4.5 and Muse Spark 1.3
BenchmarkGrok 4.5Muse Spark 1.3Leader
AA Agentic Index41.255.5Muse Spark 1.3
Design Arena: agents building web apps12181297Muse Spark 1.3
Design Arena: agents building full-stack apps12491295Muse Spark 1.3
Design Arena: agents building mobile apps12201218Grok 4.5
Design Arena: agents building Android apps1236Not measuredOnly Grok 4.5 measured
Design Arena: agents building Godot games12291241Muse Spark 1.3
Design Arena: agents building games1236Not measuredOnly Grok 4.5 measured
Design Arena: HTML slides1205Not measuredOnly Grok 4.5 measured
Design Arena: PowerPoint slides12301219Grok 4.5
Design Arena: spreadsheetsNot measured1062Only Muse Spark 1.3 measured
LiveBench research85.9%68.6%Grok 4.5
LiveBench browser44.0%80.0%Muse Spark 1.3
LiveBench long agentic27.9%40.4%Muse Spark 1.3
SREBench (Vals AI)0.8%Not measuredOnly Grok 4.5 measured
Finance Agent (Vals AI)48.4%58.9%Muse Spark 1.3
Tax Agent Bench (Vals AI)24.9%36.0%Muse Spark 1.3
Legal Research Bench (Vals AI)38.0%40.9%Muse Spark 1.3
Excel Modeling Benchmark (Vals AI)52.9%62.7%Muse Spark 1.3
Terminal-Bench-Science (Vals AI)Not measured4.3%Only Muse Spark 1.3 measured
Time Horizon Index (Vals AI)6.3%Not measuredOnly Grok 4.5 measured
APEX-Agents56.2%58.6%Muse Spark 1.3
PostTrainBench23.4%Not measuredOnly Grok 4.5 measured
Vending-Bench 2$3,887Not measuredOnly Grok 4.5 measured
LMArena Search1216Not measuredOnly Grok 4.5 measured
Neither model has a result on the other 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index09
Reasoning benchmarks for Grok 4.5 and Muse Spark 1.3
BenchmarkGrok 4.5Muse Spark 1.3Leader
GPQA Diamond92.9%Not measuredOnly Grok 4.5 measured
LiveBench reasoning87.2%89.7%Muse Spark 1.3
MMMU Pro (Vals AI)61.8%Not measuredOnly Grok 4.5 measured
GPQA Diamond (Artificial Analysis run)93.1%94.1%Muse Spark 1.3
Humanity's Last Exam (Artificial Analysis run)42.7%48.7%Muse Spark 1.3
GPQA Diamond (Epoch AI run)93.4%Not measuredOnly Grok 4.5 measured
ARC-AGI87.2%Not measuredOnly Grok 4.5 measured
ARC-AGI-252.6%Not measuredOnly Grok 4.5 measured
SimpleBench70.0%Not measuredOnly Grok 4.5 measured
Chess puzzles35.0%37.0%Muse Spark 1.3
Mystery game puzzlesNot measured25.0%Only Muse Spark 1.3 measured
LMArena Text: hard prompts14621503Muse Spark 1.3
LMArena Text: expert14651519Muse Spark 1.3
LMArena Text: hard prompts in English14641500Muse Spark 1.3
LMArena Vision: diagrams13041330Muse Spark 1.3
LMArena Vision: homework12951296Muse Spark 1.3
Kagi LLM Benchmark83.5%Not measuredOnly Grok 4.5 measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for Grok 4.5 and Muse Spark 1.3
BenchmarkGrok 4.5Muse Spark 1.3Leader
OTIS Mock AIME97.8%99.2%Muse Spark 1.3
FrontierMath, tiers 1 to 357.2%74.4%Muse Spark 1.3
FrontierMath, tier 424.4%46.3%Muse Spark 1.3
ProofBench31.0%58.0%Muse Spark 1.3
LMArena Text: math14601497Muse Spark 1.3
LMArena Text: mathematical work14821491Muse 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 4.5 and Muse Spark 1.3
BenchmarkGrok 4.5Muse Spark 1.3Leader
MMLU Pro89.2%Not measuredOnly Grok 4.5 measured
LegalBench (Vals AI)86.0%Not measuredOnly Grok 4.5 measured
CorpFin (Vals AI)67.4%Not measuredOnly Grok 4.5 measured
TaxEval (Vals AI)71.7%Not measuredOnly Grok 4.5 measured
MortgageTax (Vals AI)61.8%Not measuredOnly Grok 4.5 measured
MedCode (Vals AI)43.3%Not measuredOnly Grok 4.5 measured
SimpleQA Verified48.3%Not measuredOnly Grok 4.5 measured
LMArena Text: science14641507Muse Spark 1.3
LMArena Text: medicine and healthcare14401493Muse Spark 1.3
LMArena Text: legal and government14631499Muse Spark 1.3
LMArena Text: business and finance14411490Muse Spark 1.3
FACTS Benchmark Suite50.2%Not measuredOnly Grok 4.5 measured
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index18
Web design benchmarks for Grok 4.5 and Muse Spark 1.3
BenchmarkGrok 4.5Muse Spark 1.3Leader
Design Arena: websites12811356Muse Spark 1.3
Design Arena: UI components12801349Muse Spark 1.3
Design Arena: game dev12641328Muse Spark 1.3
Design Arena: data viz12661343Muse Spark 1.3
Design Arena: 3D12571358Muse Spark 1.3
Design Arena: all code categories12751352Muse Spark 1.3
Design Arena: SVG12151301Muse Spark 1.3
Design Arena: ASCII art12561278Muse Spark 1.3
LiveBench design78.1%74.8%Grok 4.5
GeneralLike-for-likePublic boards, shown as published, kept out of the index026
General benchmarks for Grok 4.5 and Muse Spark 1.3
BenchmarkGrok 4.5Muse Spark 1.3Leader
LiveBench data analysis73.0%79.6%Muse Spark 1.3
SAGE (Vals AI)35.0%Not measuredOnly Grok 4.5 measured
MedScribe (Vals AI)86.9%Not measuredOnly Grok 4.5 measured
Vals Multimodal Index63.4%Not measuredOnly Grok 4.5 measured
Long context reasoning (AA-LCR)79.3%83.0%Muse Spark 1.3
DTBench96.5%96.5%Tie
LMCA45.2%53.9%Muse Spark 1.3
Surface Evolver Bench74.4%Not measuredOnly Grok 4.5 measured
Furniture assembly22.5%Not measuredOnly Grok 4.5 measured
LMArena Text14481490Muse Spark 1.3
LMArena Text: instruction following14451479Muse Spark 1.3
LMArena Text: creative writing14421462Muse Spark 1.3
LMArena Vision12871308Muse Spark 1.3
LMArena Text: English14531495Muse Spark 1.3
LMArena Text: non-English14401481Muse Spark 1.3
LMArena Text: Chinese14951532Muse Spark 1.3
LMArena Text: German14481513Muse Spark 1.3
LMArena Text: Japanese14301470Muse Spark 1.3
LMArena Text: Korean14061490Muse Spark 1.3
LMArena Text: French14571511Muse Spark 1.3
LMArena Text: Spanish14511496Muse Spark 1.3
LMArena Text: Russian14491491Muse Spark 1.3
LMArena Text: Polish14321490Muse Spark 1.3
LMArena Text: multi-turn14561487Muse Spark 1.3
LMArena Text: longer queries14621488Muse Spark 1.3
LMArena Text: writing and language14451470Muse Spark 1.3
LMArena Text: entertainment and media14341457Muse Spark 1.3
LMArena Vision: English12851298Muse Spark 1.3
LMArena Vision: Chinese13451384Muse Spark 1.3
LMArena Vision: reading text12931319Muse Spark 1.3
LMArena Vision: humor12761293Muse Spark 1.3
LMArena Vision: creative writing12931296Muse Spark 1.3
LMArena Document1452Not measuredOnly Grok 4.5 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 4.5 and Muse Spark 1.3
BenchmarkGrok 4.5Muse 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 4.5$0.0050Fits in one request
Muse Spark 1.3$0.0034Fits in one request

Muse Spark 1.3 costs less

Repository review

50K input + 3K output tokens

Grok 4.5$0.118Fits in one request
Muse Spark 1.3$0.075Fits in one request

Muse Spark 1.3 costs less

Agent loop

200K input + 10K output tokens

Grok 4.5$0.460Fits in one request
Muse Spark 1.3$0.292Fits in one request

Muse Spark 1.3 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 4.5 and Muse Spark 1.3
SpecificationSpaceXAI Grok 4.5Meta Muse Spark 1.3
MakerxAIMeta
WeightsNo public weights listedNo public weights listed
ReleasedJuly 8, 2026September 2, 2026
Context window500K1.05M
Input $/Mtok$2.00$1.25
Output $/Mtok$6.00$4.25
Coding index58.657.4
Independent measurements behind it64
Cost per solved task$0.62Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Grok 4.5 better than Muse Spark 1.3 for coding?

Grok 4.5 and Muse Spark 1.3 are level for coding, 58.6 against 57.4 on the Vibe Coding Index, so price and context decide. Pick Muse Spark 1.3 for output tokens 1.4x cheaper ($4.25 vs $6.00 per million) and a larger context window (1.05M against 500K tokens). Pick Grok 4.5 for work measured by LiveBench coding or Code migration (Vals AI), where it leads.

Which is cheaper, Grok 4.5 or Muse Spark 1.3?

Grok 4.5 costs $2.00 per million input tokens and $6.00 per million output tokens; Muse Spark 1.3 costs $1.25 and $4.25. Cost per solved task is known for Grok 4.5 only.

Which has the bigger context window, Grok 4.5 or Muse Spark 1.3?

Muse Spark 1.3, with 1.05M tokens against 500K.

How many benchmarks is the Grok 4.5 vs Muse Spark 1.3 comparison based on?

88 benchmarks have a result for both models as of October 22, 2026. Grok 4.5's coding index rests on 6 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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<iframe src="https://llmbenchmark.ai/embed/compare/grok-4-5-vs-meta-muse-spark-1-3" title="Grok 4.5 vs Muse Spark 1.3, 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-4-5-vs-meta-muse-spark-1-3">LLMBenchmark.ai, Grok 4.5 vs Muse Spark 1.3</a></p>