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GPT-5.4 Mini vs Muse Spark 1.3

Muse Spark 1.3 leads GPT-5.4 Mini on coding, 57.4 to 35.8 on the Vibe Coding Index, at about the same output price ($4.25 vs $4.50 per million). Updated October 22, 2026; 65 benchmarks have a result for both.

Replace GPT-5.4 Mini Replace Muse Spark 1.3
GPT-5.4 MiniOpenAI
Coding
35.8
Overall
44.0
Output $/M
$4.50
0
Muse Spark 1.3Meta
Coding
57.4
Overall
68.6
Output $/M
$4.25
65
vs boards won of 65 shared

GPT-5.4 Mini 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 35.8 for GPT-5.4 Mini, though on 4 benchmarks against 5.

GPT-5.4 Mini is neither cheaper nor larger in context, and leads no benchmark both models were measured on.

Model AGPT-5.4 MiniOpenAI35.8/1005 independent benchmarks$0.70 per solved taskModel BMuse Spark 1.3Meta57.4/1004 independent benchmarksNo cost per solved task
Shared results
65
GPT-5.4 Mini only
24
Muse Spark 1.3 only
27
Like-for-like categories
7 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
GPT-5.4 Mini 35.8 from 5 benchmarks, Muse Spark 1.3 57.4 from 4 benchmarks.
Widest category
Agentic work, 24.8 points apart on average over 5 shared benchmarks.
Widest single gap
AA Agentic Index: GPT-5.4 Mini 17.9 against Muse Spark 1.3 55.5, 37.6 points apart on a 0 to 100 scale.
Output price
GPT-5.4 Mini $4.50 against Muse Spark 1.3 $4.25 per million output tokens, 1.1x apart.
Context window
GPT-5.4 Mini takes 400K 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
CategoryGPT-5.4 MiniBarsMuse Spark 1.3Ties
Coding013
Intelligence02
Agentic work05
Reasoning09
Math06
Knowledge04
General026
All shared boards065
CodingLike-for-likeSix of these boards feed the Vibe Coding Index013
Coding benchmarks for GPT-5.4 Mini and Muse Spark 1.3
BenchmarkGPT-5.4 MiniMuse Spark 1.3Leader
LiveBench codingNot measured90.2%Only Muse Spark 1.3 measured
LMArena WebDev13971659Muse Spark 1.3
AA Coding Index56.175.8Muse Spark 1.3
LiveCodeBench (Vals AI)81.5%Not measuredOnly GPT-5.4 Mini measured
SWE-bench Verified (Vals AI)73.0%Not measuredOnly GPT-5.4 Mini measured
Terminal-Bench 4 (Vals AI)2.5%10.6%Muse Spark 1.3
Vibe Code Bench (Vals AI)48.0%82.9%Muse Spark 1.3
Code migration (Vals AI)12.9%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)54.7%72.3%Muse Spark 1.3
CyberBench (Vals AI)Not measured69.4%Only Muse Spark 1.3 measured
SciCode52.1%59.7%Muse Spark 1.3
Terminal-Bench Hard (Artificial Analysis run)52.3%Not measuredOnly GPT-5.4 Mini measured
FrontierCode27.0%Not measuredOnly GPT-5.4 Mini measured
FrontierSWENot measured25.8%Only Muse Spark 1.3 measured
WeirdML60.3%Not measuredOnly GPT-5.4 Mini measured
ALE-Bench1188.61688.3Muse Spark 1.3
LMArena Text: coding14381510Muse Spark 1.3
LMArena Text: software and IT14361511Muse Spark 1.3
LMArena WebDev: React13861672Muse Spark 1.3
LMArena WebDev: HTML14191653Muse Spark 1.3
LMArena WebDev: from an imageNot measured1640Only Muse Spark 1.3 measured
Neither model has a result on the other 16 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GPT-5.4 Mini and Muse Spark 1.3
BenchmarkGPT-5.4 MiniMuse Spark 1.3Leader
AA Intelligence Index24.148.1Muse Spark 1.3
Epoch Capabilities Index148.7157.2Muse Spark 1.3
Agentic workLike-for-likePublic boards, shown as published, kept out of the index05
Agentic work benchmarks for GPT-5.4 Mini and Muse Spark 1.3
BenchmarkGPT-5.4 MiniMuse Spark 1.3Leader
AA Agentic Index17.955.5Muse Spark 1.3
Design Arena: agents building web appsNot measured1297Only Muse Spark 1.3 measured
Design Arena: agents building full-stack appsNot measured1295Only Muse Spark 1.3 measured
Design Arena: agents building mobile appsNot measured1218Only Muse Spark 1.3 measured
Design Arena: agents building Godot gamesNot measured1241Only Muse Spark 1.3 measured
Design Arena: PowerPoint slidesNot measured1219Only Muse Spark 1.3 measured
Design Arena: spreadsheetsNot measured1062Only Muse Spark 1.3 measured
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)45.4%58.9%Muse Spark 1.3
Tax Agent Bench (Vals AI)8.8%36.0%Muse Spark 1.3
Legal Research Bench (Vals AI)12.5%40.9%Muse Spark 1.3
Excel Modeling Benchmark (Vals AI)45.4%62.7%Muse Spark 1.3
Terminal-Bench-Science (Vals AI)Not measured4.3%Only Muse Spark 1.3 measured
τ²-Bench Telecom83.3%Not measuredOnly GPT-5.4 Mini measured
APEX-AgentsNot measured58.6%Only Muse Spark 1.3 measured
DeepResearch Bench36.3%Not measuredOnly GPT-5.4 Mini measured
Neither model has a result on the other 23 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index09
Reasoning benchmarks for GPT-5.4 Mini and Muse Spark 1.3
BenchmarkGPT-5.4 MiniMuse Spark 1.3Leader
GPQA Diamond83.1%Not measuredOnly GPT-5.4 Mini measured
LiveBench reasoningNot measured89.7%Only Muse Spark 1.3 measured
MMMU Pro (Vals AI)79.3%Not measuredOnly GPT-5.4 Mini measured
GPQA Diamond (Artificial Analysis run)87.5%94.1%Muse Spark 1.3
Humanity's Last Exam (Artificial Analysis run)28.1%48.7%Muse Spark 1.3
GPQA Diamond (Epoch AI run)86.9%Not measuredOnly GPT-5.4 Mini measured
ARC-AGI63.7%Not measuredOnly GPT-5.4 Mini measured
ARC-AGI-218.9%Not measuredOnly GPT-5.4 Mini measured
Chess puzzles23.0%37.0%Muse Spark 1.3
Mystery game puzzles11.0%25.0%Muse Spark 1.3
LMArena Text: hard prompts14241503Muse Spark 1.3
LMArena Text: expert14351519Muse Spark 1.3
LMArena Text: hard prompts in English14201500Muse Spark 1.3
LMArena Vision: diagrams12661330Muse Spark 1.3
LMArena Vision: homework12851296Muse Spark 1.3
Kagi LLM Benchmark37.9%Not measuredOnly GPT-5.4 Mini measured
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for GPT-5.4 Mini and Muse Spark 1.3
BenchmarkGPT-5.4 MiniMuse Spark 1.3Leader
AIME95.6%Not measuredOnly GPT-5.4 Mini measured
OTIS Mock AIME88.9%99.2%Muse Spark 1.3
FrontierMath, tiers 1 to 351.2%74.4%Muse Spark 1.3
FrontierMath, tier 49.8%46.3%Muse Spark 1.3
ProofBench21.0%58.0%Muse Spark 1.3
LMArena Text: math14181497Muse Spark 1.3
LMArena Text: mathematical work14291491Muse Spark 1.3
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index04
Knowledge benchmarks for GPT-5.4 Mini and Muse Spark 1.3
BenchmarkGPT-5.4 MiniMuse Spark 1.3Leader
MMLU Pro84.5%Not measuredOnly GPT-5.4 Mini measured
CaseLaw (Vals AI)51.7%Not measuredOnly GPT-5.4 Mini measured
CorpFin (Vals AI)60.9%Not measuredOnly GPT-5.4 Mini measured
TaxEval (Vals AI)71.2%Not measuredOnly GPT-5.4 Mini measured
MortgageTax (Vals AI)63.5%Not measuredOnly GPT-5.4 Mini measured
SimpleQA Verified29.4%Not measuredOnly GPT-5.4 Mini measured
LMArena Text: science14171507Muse Spark 1.3
LMArena Text: medicine and healthcare13951493Muse Spark 1.3
LMArena Text: legal and government14141499Muse Spark 1.3
LMArena Text: business and finance14181490Muse Spark 1.3
Neither model has a result on the other 8 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
Web design benchmarks for GPT-5.4 Mini and Muse Spark 1.3
BenchmarkGPT-5.4 MiniMuse Spark 1.3Leader
Design Arena: websitesNot measured1356Only Muse Spark 1.3 measured
Design Arena: UI componentsNot measured1349Only Muse Spark 1.3 measured
Design Arena: game devNot measured1328Only Muse Spark 1.3 measured
Design Arena: data vizNot measured1343Only Muse Spark 1.3 measured
Design Arena: 3DNot measured1358Only Muse Spark 1.3 measured
Design Arena: all code categoriesNot measured1352Only Muse Spark 1.3 measured
Design Arena: SVGNot measured1301Only Muse Spark 1.3 measured
Design Arena: ASCII artNot measured1278Only Muse Spark 1.3 measured
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 GPT-5.4 Mini and Muse Spark 1.3
BenchmarkGPT-5.4 MiniMuse Spark 1.3Leader
LiveBench data analysisNot measured79.6%Only Muse Spark 1.3 measured
SAGE (Vals AI)50.8%Not measuredOnly GPT-5.4 Mini measured
Vals Multimodal Index54.2%Not measuredOnly GPT-5.4 Mini measured
IFBench73.3%Not measuredOnly GPT-5.4 Mini measured
Long context reasoning (AA-LCR)77.0%83.0%Muse Spark 1.3
DTBench80.0%96.5%Muse Spark 1.3
LMCA40.8%53.9%Muse Spark 1.3
LMArena Text14121490Muse Spark 1.3
LMArena Text: instruction following14051479Muse Spark 1.3
LMArena Text: creative writing13701462Muse Spark 1.3
LMArena Vision12451308Muse Spark 1.3
LMArena Text: English14121495Muse Spark 1.3
LMArena Text: non-English14051481Muse Spark 1.3
LMArena Text: Chinese14461532Muse Spark 1.3
LMArena Text: German14081513Muse Spark 1.3
LMArena Text: Japanese13751470Muse Spark 1.3
LMArena Text: Korean13701490Muse Spark 1.3
LMArena Text: French14411511Muse Spark 1.3
LMArena Text: Spanish14051496Muse Spark 1.3
LMArena Text: Russian14171491Muse Spark 1.3
LMArena Text: Polish14151490Muse Spark 1.3
LMArena Text: multi-turn14291487Muse Spark 1.3
LMArena Text: longer queries14081488Muse Spark 1.3
LMArena Text: writing and language13931470Muse Spark 1.3
LMArena Text: entertainment and media13731457Muse Spark 1.3
LMArena Vision: English12441298Muse Spark 1.3
LMArena Vision: Chinese12861384Muse Spark 1.3
LMArena Vision: reading text12531319Muse Spark 1.3
LMArena Vision: humor12351293Muse Spark 1.3
LMArena Vision: recognizing things1218Not measuredOnly GPT-5.4 Mini measured
LMArena Vision: creative writing12221296Muse Spark 1.3
Neither model has a result on the other 15 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5.4 Mini and Muse Spark 1.3
BenchmarkGPT-5.4 MiniMuse 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

GPT-5.4 Mini$0.0030Fits in one request
Muse Spark 1.3$0.0034Fits in one request

GPT-5.4 Mini costs less

Repository review

50K input + 3K output tokens

GPT-5.4 Mini$0.051Fits in one request
Muse Spark 1.3$0.075Fits in one request

GPT-5.4 Mini costs less

Agent loop

200K input + 10K output tokens

GPT-5.4 Mini$0.195Fits in one request
Muse Spark 1.3$0.292Fits in one request

GPT-5.4 Mini 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 GPT-5.4 Mini and Muse Spark 1.3
SpecificationOpenAI GPT-5.4 MiniMeta Muse Spark 1.3
MakerOpenAIMeta
WeightsNo public weights listedNo public weights listed
ReleasedMarch 17, 2026September 2, 2026
Context window400K1.05M
Input $/Mtok$0.75$1.25
Output $/Mtok$4.50$4.25
Coding index35.857.4
Independent measurements behind it54
Cost per solved task$0.70Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.4 Mini 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 35.8 for GPT-5.4 Mini, though on 4 benchmarks against 5. GPT-5.4 Mini is neither cheaper nor larger in context, and leads no benchmark both models were measured on.

Which is cheaper, GPT-5.4 Mini or Muse Spark 1.3?

GPT-5.4 Mini costs $0.75 per million input tokens and $4.50 per million output tokens; Muse Spark 1.3 costs $1.25 and $4.25. Cost per solved task is known for GPT-5.4 Mini only.

Which has the bigger context window, GPT-5.4 Mini or Muse Spark 1.3?

Muse Spark 1.3, with 1.05M tokens against 400K.

How many benchmarks is the GPT-5.4 Mini vs Muse Spark 1.3 comparison based on?

65 benchmarks have a result for both models as of October 22, 2026. GPT-5.4 Mini's coding index rests on 5 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/gpt-5-4-mini-vs-meta-muse-spark-1-3">LLMBenchmark.ai, GPT-5.4 Mini vs Muse Spark 1.3</a></p>