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Grok 4.5 vs Muse Spark 1.1

Muse Spark 1.1 leads Grok 4.5 on coding, 70.3 to 58.6 on the Vibe Coding Index, and Muse Spark 1.1 costs 1.4x less per output token ($4.25 vs $6.00 per million). Updated October 22, 2026; 94 benchmarks have a result for both.

Replace Grok 4.5 Replace Muse Spark 1.1
Grok 4.5xAI
Coding
58.6
Overall
62.1
Output $/M
$6.00
34
Muse Spark 1.1Meta
Coding
70.3
Overall
67.0
Output $/M
$4.25
58
vs boards won of 94 shared, 2 tied

Grok 4.5 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 58.6 for Grok 4.5, though on 3 benchmarks against 6.

Pick Grok 4.5 for work measured by LMArena WebDev or AA Coding Index, where it leads.

Model AGrok 4.5xAI58.6/1006 independent benchmarks$0.62 per solved taskModel BMuse Spark 1.1Meta70.3/1003 independent benchmarks$0.43 per solved task
Shared results
94
Grok 4.5 only
29
Muse Spark 1.1 only
2
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 1.1 70.3 from 3 benchmarks.
Widest category
Agentic work, 8.4 points apart on average over 15 shared benchmarks.
Widest single gap
MMMU Pro (Vals AI): Grok 4.5 61.8% against Muse Spark 1.1 86.6%, 24.8 points apart on a 0 to 100 scale.
Output price
Grok 4.5 $6.00 against Muse Spark 1.1 $4.25 per million output tokens, 1.4x apart.
Context window
Grok 4.5 takes 500K 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 4.5BarsMuse Spark 1.1Ties
Coding951 tie
Intelligence20
Agentic work1131 tie
Reasoning46
Math03
Knowledge28
Web design17
General526
All shared boards34582 ties
CodingLike-for-likeSix of these boards feed the Vibe Coding Index95
Coding benchmarks for Grok 4.5 and Muse Spark 1.1
BenchmarkGrok 4.5Muse Spark 1.1Leader
LiveBench coding94.3%Not measuredOnly Grok 4.5 measured
LMArena WebDev15531542Grok 4.5
AA Coding Index72.471.3Grok 4.5
LiveCodeBench (Vals AI)87.3%85.9%Grok 4.5
SWE-bench Verified (Vals AI)86.6%82.0%Grok 4.5
Terminal-Bench 4 (Vals AI)8.6%Not measuredOnly Grok 4.5 measured
Vibe Code Bench (Vals AI)69.0%72.2%Muse Spark 1.1
Code migration (Vals AI)36.6%31.1%Grok 4.5
ProgramBench (Vals AI)0.0%0.0%Tie
IOI (Vals AI)40.6%Not measuredOnly Grok 4.5 measured
Terminal-Bench 2.1 (Vals AI)67.8%69.3%Muse Spark 1.1
SkillsBench (Vals AI)66.0%59.2%Grok 4.5
CyberBench (Vals AI)71.0%Not measuredOnly Grok 4.5 measured
SciCode55.0%58.8%Muse Spark 1.1
FrontierCode42.4%Not measuredOnly Grok 4.5 measured
WeirdML46.4%Not measuredOnly Grok 4.5 measured
ALE-Bench1309.3Not measuredOnly Grok 4.5 measured
LMArena Text: coding14741498Muse Spark 1.1
LMArena Text: software and IT14711498Muse Spark 1.1
LMArena WebDev: React15561532Grok 4.5
LMArena WebDev: HTML15671540Grok 4.5
LMArena WebDev: from an image15621540Grok 4.5
SciCode6.5%Not measuredOnly Grok 4.5 measured
Neither model has a result on the other 16 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Grok 4.5 and Muse Spark 1.1
BenchmarkGrok 4.5Muse Spark 1.1Leader
AA Intelligence Index38.833.7Grok 4.5
Epoch Capabilities Index154.1154.1Grok 4.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index113
Agentic work benchmarks for Grok 4.5 and Muse Spark 1.1
BenchmarkGrok 4.5Muse Spark 1.1Leader
AA Agentic Index41.225.8Grok 4.5
Design Arena: agents building web apps12181207Grok 4.5
Design Arena: agents building full-stack apps12491199Grok 4.5
Design Arena: agents building mobile apps12201175Grok 4.5
Design Arena: agents building Android apps12361178Grok 4.5
Design Arena: agents building Godot games12291103Grok 4.5
Design Arena: agents building games12361183Grok 4.5
Design Arena: HTML slides12051195Grok 4.5
Design Arena: PowerPoint slides12301155Grok 4.5
Design Arena: spreadsheetsNot measured1042Only Muse Spark 1.1 measured
LiveBench research85.9%Not measuredOnly Grok 4.5 measured
LiveBench browser44.0%Not measuredOnly Grok 4.5 measured
LiveBench long agentic27.9%Not measuredOnly Grok 4.5 measured
SREBench (Vals AI)0.8%Not measuredOnly Grok 4.5 measured
Finance Agent (Vals AI)48.4%57.2%Muse Spark 1.1
Tax Agent Bench (Vals AI)24.9%Not measuredOnly Grok 4.5 measured
Legal Research Bench (Vals AI)38.0%38.0%Tie
Excel Modeling Benchmark (Vals AI)52.9%56.4%Muse Spark 1.1
Time Horizon Index (Vals AI)6.3%1.7%Grok 4.5
APEX-Agents56.2%31.8%Grok 4.5
PostTrainBench23.4%Not measuredOnly Grok 4.5 measured
Vending-Bench 2$3,887$6,520Muse Spark 1.1
LMArena Search1216Not measuredOnly Grok 4.5 measured
Neither model has a result on the other 18 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index46
Reasoning benchmarks for Grok 4.5 and Muse Spark 1.1
BenchmarkGrok 4.5Muse Spark 1.1Leader
GPQA Diamond92.9%91.2%Grok 4.5
LiveBench reasoning87.2%Not measuredOnly Grok 4.5 measured
MMMU Pro (Vals AI)61.8%86.6%Muse Spark 1.1
GPQA Diamond (Artificial Analysis run)93.1%89.8%Grok 4.5
Humanity's Last Exam (Artificial Analysis run)42.7%46.2%Muse Spark 1.1
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%34.0%Grok 4.5
LMArena Text: hard prompts14621485Muse Spark 1.1
LMArena Text: expert14651478Muse Spark 1.1
LMArena Text: hard prompts in English14641480Muse Spark 1.1
LMArena Vision: diagrams13041305Muse Spark 1.1
LMArena Vision: homework12951287Grok 4.5
Kagi LLM Benchmark83.5%Not measuredOnly Grok 4.5 measured
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index03
Math benchmarks for Grok 4.5 and Muse Spark 1.1
BenchmarkGrok 4.5Muse Spark 1.1Leader
OTIS Mock AIME97.8%Not measuredOnly Grok 4.5 measured
FrontierMath, tiers 1 to 357.2%Not measuredOnly Grok 4.5 measured
FrontierMath, tier 424.4%Not measuredOnly Grok 4.5 measured
ProofBench31.0%39.0%Muse Spark 1.1
LMArena Text: math14601482Muse Spark 1.1
LMArena Text: mathematical work14821487Muse 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 index28
Knowledge benchmarks for Grok 4.5 and Muse Spark 1.1
BenchmarkGrok 4.5Muse Spark 1.1Leader
MMLU Pro89.2%88.7%Grok 4.5
LegalBench (Vals AI)86.0%85.0%Grok 4.5
CorpFin (Vals AI)67.4%71.3%Muse Spark 1.1
TaxEval (Vals AI)71.7%79.7%Muse Spark 1.1
MortgageTax (Vals AI)61.8%66.1%Muse Spark 1.1
MedCode (Vals AI)43.3%Not measuredOnly Grok 4.5 measured
SimpleQA Verified48.3%57.8%Muse Spark 1.1
LMArena Text: science14641484Muse Spark 1.1
LMArena Text: medicine and healthcare14401479Muse Spark 1.1
LMArena Text: legal and government14631481Muse Spark 1.1
LMArena Text: business and finance14411470Muse Spark 1.1
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 index17
Web design benchmarks for Grok 4.5 and Muse Spark 1.1
BenchmarkGrok 4.5Muse Spark 1.1Leader
Design Arena: websites12811270Grok 4.5
Design Arena: UI components12801289Muse Spark 1.1
Design Arena: game dev12641269Muse Spark 1.1
Design Arena: data viz12661268Muse Spark 1.1
Design Arena: 3D12571260Muse Spark 1.1
Design Arena: all code categories12751276Muse Spark 1.1
Design Arena: SVG12151235Muse Spark 1.1
Design Arena: ASCII art12561271Muse Spark 1.1
LiveBench design78.1%Not measuredOnly Grok 4.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index526
General benchmarks for Grok 4.5 and Muse Spark 1.1
BenchmarkGrok 4.5Muse Spark 1.1Leader
LiveBench data analysis73.0%Not measuredOnly Grok 4.5 measured
Public Benefits Bench (Vals AI)Not measured61.3%Only Muse Spark 1.1 measured
SAGE (Vals AI)35.0%45.6%Muse Spark 1.1
MedScribe (Vals AI)86.9%88.9%Muse Spark 1.1
Vals Multimodal Index63.4%66.7%Muse Spark 1.1
Long context reasoning (AA-LCR)79.3%77.7%Grok 4.5
DTBench96.5%94.4%Grok 4.5
LMCA45.2%49.9%Muse Spark 1.1
Surface Evolver Bench74.4%52.5%Grok 4.5
Furniture assembly22.5%Not measuredOnly Grok 4.5 measured
LMArena Text14481478Muse Spark 1.1
LMArena Text: instruction following14451457Muse Spark 1.1
LMArena Text: creative writing14421435Grok 4.5
LMArena Vision12871293Muse Spark 1.1
LMArena Text: English14531478Muse Spark 1.1
LMArena Text: non-English14401471Muse Spark 1.1
LMArena Text: Chinese14951515Muse Spark 1.1
LMArena Text: German14481469Muse Spark 1.1
LMArena Text: Japanese14301450Muse Spark 1.1
LMArena Text: Korean14061459Muse Spark 1.1
LMArena Text: French14571492Muse Spark 1.1
LMArena Text: Spanish14511464Muse Spark 1.1
LMArena Text: Russian14491482Muse Spark 1.1
LMArena Text: Polish14321499Muse Spark 1.1
LMArena Text: multi-turn14561484Muse Spark 1.1
LMArena Text: longer queries14621462Muse Spark 1.1
LMArena Text: writing and language14451448Muse Spark 1.1
LMArena Text: entertainment and media14341438Muse Spark 1.1
LMArena Vision: English12851292Muse Spark 1.1
LMArena Vision: Chinese13451348Muse Spark 1.1
LMArena Vision: reading text12931301Muse Spark 1.1
LMArena Vision: humor12761288Muse Spark 1.1
LMArena Vision: creative writing12931253Grok 4.5
LMArena Document14521465Muse Spark 1.1
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 4.5 and Muse Spark 1.1
BenchmarkGrok 4.5Muse 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 4.5$0.0050Fits in one request
Muse Spark 1.1$0.0034Fits in one request

Muse Spark 1.1 costs less

Repository review

50K input + 3K output tokens

Grok 4.5$0.118Fits in one request
Muse Spark 1.1$0.075Fits in one request

Muse Spark 1.1 costs less

Agent loop

200K input + 10K output tokens

Grok 4.5$0.460Fits in one request
Muse Spark 1.1$0.292Fits in one request

Muse Spark 1.1 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 1.1
SpecificationSpaceXAI Grok 4.5Meta Muse Spark 1.1
MakerxAIMeta
WeightsNo public weights listedNo public weights listed
ReleasedJuly 8, 2026July 16, 2026
Context window500K1.05M
Input $/Mtok$2.00$1.25
Output $/Mtok$6.00$4.25
Coding index58.670.3
Independent measurements behind it63
Cost per solved task$0.62$0.43
SourceOpenRouter listingOpenRouter listing

Questions

Is Grok 4.5 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 58.6 for Grok 4.5, though on 3 benchmarks against 6. Pick Grok 4.5 for work measured by LMArena WebDev or AA Coding Index, where it leads.

Which is cheaper, Grok 4.5 or Muse Spark 1.1?

Grok 4.5 costs $2.00 per million input tokens and $6.00 per million output tokens; Muse Spark 1.1 costs $1.25 and $4.25. Per solved SWE-bench Verified task, Grok 4.5 costs $0.62 and Muse Spark 1.1 $0.43.

Which has the bigger context window, Grok 4.5 or Muse Spark 1.1?

Muse Spark 1.1, with 1.05M tokens against 500K.

How many benchmarks is the Grok 4.5 vs Muse Spark 1.1 comparison based on?

94 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 1.1's on 3. 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-4-5-vs-meta-muse-spark-1-1">LLMBenchmark.ai, Grok 4.5 vs Muse Spark 1.1</a></p>