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GPT-6 Astra vs Muse Spark 1.3

Updated October 21, 2026. 91 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GPT-6 Astra Replace Muse Spark 1.3
GPT-6 AstraOpenAI
Coding
88.7
Overall
52.7
Output $/M
$50.00
48
Muse Spark 1.3Meta
Coding
79.7
Overall
48.1
Output $/M
$4.25
43
vs boards won of 91 shared

Decision reading

Pick GPT-6 Astra for coding: it scores 88.7 on the Vibe Coding Index against 79.7 for Muse Spark 1.3.

Pick Muse Spark 1.3 when output tokens cost 11.8x less, or when what matters is CyberBench (Vals AI) or SciCode, where it leads.

Model AGPT-6 AstraOpenAI88.7/1002 independent benchmarksNo cost per solved taskModel BMuse Spark 1.3Meta79.7/1002 independent benchmarksNo cost per solved task
Shared results
91
GPT-6 Astra only
28
Muse Spark 1.3 only
1
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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-6 Astra 88.7 from 2 benchmarks, Muse Spark 1.3 79.7 from 2 benchmarks.
Widest category
Math, 19.8 points apart on average over 6 shared benchmarks.
Widest single gap
Mystery game puzzles: GPT-6 Astra 84.0% against Muse Spark 1.3 25.0%, 59.0 points apart on a 0 to 100 scale.
Output price
GPT-6 Astra $50.00 against Muse Spark 1.3 $4.25 per million output tokens, 11.8x apart.
Context window
GPT-6 Astra takes 1.05M 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-6 AstraBarsMuse Spark 1.3Ties
Coding144
Intelligence20
Agentic work124
Reasoning64
Math42
Knowledge04
Web design72
General323
All shared boards4843
CodingLike-for-likeFour of these boards feed the Vibe Coding Index144
Coding benchmarks for GPT-6 Astra and Muse Spark 1.3
BenchmarkGPT-6 AstraMuse Spark 1.3Leader
LiveBench coding93.7%90.2%GPT-6 Astra
LMArena WebDev17741659GPT-6 Astra
AA Coding Index76.975.8GPT-6 Astra
Terminal-Bench 4 (Vals AI)59.6%10.6%GPT-6 Astra
Vibe Code Bench (Vals AI)89.6%82.9%GPT-6 Astra
Code migration (Vals AI)67.7%27.6%GPT-6 Astra
ProgramBench (Vals AI)5.5%0.5%GPT-6 Astra
IOI (Vals AI)100.0%43.9%GPT-6 Astra
Terminal-Bench 2.1 (Vals AI)87.3%72.3%GPT-6 Astra
SWE-bench Multimodal (Vals AI)43.3%Not measuredOnly GPT-6 Astra measured
Vibe Code Bench 1-100 (Vals AI)27.6%Not measuredOnly GPT-6 Astra measured
CyberBench (Vals AI)41.1%69.4%Muse Spark 1.3
SciCode56.5%59.7%Muse Spark 1.3
FrontierCode53.3%Not measuredOnly GPT-6 Astra measured
FrontierSWE65.5%25.8%GPT-6 Astra
GSO-Bench79.4%Not measuredOnly GPT-6 Astra measured
WeirdML93.3%Not measuredOnly GPT-6 Astra measured
MirrorCode46.7%Not measuredOnly GPT-6 Astra measured
ALE-Bench2951.31688.3GPT-6 Astra
LMArena Text: coding14891510Muse Spark 1.3
LMArena Text: software and IT14741511Muse Spark 1.3
LMArena WebDev: React17981672GPT-6 Astra
LMArena WebDev: HTML17751653GPT-6 Astra
LMArena WebDev: from an image17261640GPT-6 Astra
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-6 Astra and Muse Spark 1.3
BenchmarkGPT-6 AstraMuse Spark 1.3Leader
AA Intelligence Index52.748.1GPT-6 Astra
Epoch Capabilities Index168.8157.2GPT-6 Astra
Agentic workLike-for-likePublic boards, shown as published, kept out of the index124
Agentic work benchmarks for GPT-6 Astra and Muse Spark 1.3
BenchmarkGPT-6 AstraMuse Spark 1.3Leader
AA Agentic Index51.055.5Muse Spark 1.3
Design Arena: agents building web apps13721297GPT-6 Astra
Design Arena: agents building full-stack apps13571295GPT-6 Astra
Design Arena: agents building mobile apps13121217GPT-6 Astra
Design Arena: agents building Godot games13481241GPT-6 Astra
Design Arena: PowerPoint slides12451244GPT-6 Astra
Design Arena: spreadsheets13801048GPT-6 Astra
LiveBench research85.2%68.6%GPT-6 Astra
LiveBench browser84.0%80.0%GPT-6 Astra
LiveBench long agentic82.4%40.4%GPT-6 Astra
SREBench (Vals AI)56.9%Not measuredOnly GPT-6 Astra measured
Finance Agent (Vals AI)53.5%58.9%Muse Spark 1.3
Tax Agent Bench (Vals AI)20.7%36.0%Muse Spark 1.3
Legal Research Bench (Vals AI)39.4%40.9%Muse Spark 1.3
Harvey's Legal Agent Benchmark (Vals AI)7.1%Not measuredOnly GPT-6 Astra measured
Excel Modeling Benchmark (Vals AI)71.7%62.7%GPT-6 Astra
BioMysteryBench (Vals AI)79.3%Not measuredOnly GPT-6 Astra measured
Terminal-Bench-Science (Vals AI)62.9%4.3%GPT-6 Astra
Vals Science Index65.1%Not measuredOnly GPT-6 Astra measured
Time Horizon Index (Vals AI)90.5%Not measuredOnly GPT-6 Astra measured
CUA-bench (Vals AI)19.2%Not measuredOnly GPT-6 Astra measured
Robo-bench (Vals AI)23.3%Not measuredOnly GPT-6 Astra measured
APEX-Agents64.7%58.6%GPT-6 Astra
Remote Labor Index20.8%Not measuredOnly GPT-6 Astra measured
BALROG68.3%Not measuredOnly GPT-6 Astra measured
SpireClimb25.7%Not measuredOnly GPT-6 Astra measured
Vending-Bench 2$15,515Not measuredOnly GPT-6 Astra measured
Neither model has a result on the other 12 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index64
Reasoning benchmarks for GPT-6 Astra and Muse Spark 1.3
BenchmarkGPT-6 AstraMuse Spark 1.3Leader
LiveBench reasoning92.7%89.7%GPT-6 Astra
MysteryMechanism (Vals AI)53.1%Not measuredOnly GPT-6 Astra measured
GPQA Diamond (Artificial Analysis run)96.3%94.1%GPT-6 Astra
Humanity's Last Exam (Artificial Analysis run)54.7%48.7%GPT-6 Astra
GPQA Diamond (Epoch AI run)95.8%Not measuredOnly GPT-6 Astra measured
ARC-AGI98.5%Not measuredOnly GPT-6 Astra measured
ARC-AGI-295.0%Not measuredOnly GPT-6 Astra measured
Chess puzzles74.0%37.0%GPT-6 Astra
Mystery game puzzles84.0%25.0%GPT-6 Astra
EBR-bench76.2%Not measuredOnly GPT-6 Astra measured
LMArena Text: hard prompts14631503Muse Spark 1.3
LMArena Text: expert14891519Muse Spark 1.3
LMArena Text: hard prompts in English14641500Muse Spark 1.3
LMArena Vision: diagrams12971330Muse Spark 1.3
LMArena Vision: homework13371296GPT-6 Astra
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index42
Math benchmarks for GPT-6 Astra and Muse Spark 1.3
BenchmarkGPT-6 AstraMuse Spark 1.3Leader
OTIS Mock AIME100.0%99.2%GPT-6 Astra
FrontierMath, tiers 1 to 393.7%74.4%GPT-6 Astra
FrontierMath, tier 497.6%46.3%GPT-6 Astra
ProofBench99.0%58.0%GPT-6 Astra
LMArena Text: math14651497Muse Spark 1.3
LMArena Text: mathematical work14841491Muse 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 GPT-6 Astra and Muse Spark 1.3
BenchmarkGPT-6 AstraMuse Spark 1.3Leader
MedCode (Vals AI)48.5%Not measuredOnly GPT-6 Astra measured
SimpleQA Verified75.6%Not measuredOnly GPT-6 Astra measured
LMArena Text: science14511507Muse Spark 1.3
LMArena Text: medicine and healthcare14251493Muse Spark 1.3
LMArena Text: legal and government14621499Muse Spark 1.3
LMArena Text: business and finance14391490Muse Spark 1.3
Neither model has a result on the other 11 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index72
Web design benchmarks for GPT-6 Astra and Muse Spark 1.3
BenchmarkGPT-6 AstraMuse Spark 1.3Leader
Design Arena: websites13371356Muse Spark 1.3
Design Arena: UI components13941352GPT-6 Astra
Design Arena: game dev14741329GPT-6 Astra
Design Arena: data viz13351343Muse Spark 1.3
Design Arena: 3D15011359GPT-6 Astra
Design Arena: all code categories13791353GPT-6 Astra
Design Arena: SVG14311300GPT-6 Astra
Design Arena: ASCII art13591280GPT-6 Astra
LiveBench design82.0%74.8%GPT-6 Astra
GeneralLike-for-likePublic boards, shown as published, kept out of the index323
General benchmarks for GPT-6 Astra and Muse Spark 1.3
BenchmarkGPT-6 AstraMuse Spark 1.3Leader
Vals Index65.0%Not measuredOnly GPT-6 Astra measured
LiveBench data analysis83.0%79.6%GPT-6 Astra
SAGE (Vals AI)46.4%Not measuredOnly GPT-6 Astra measured
MedScribe (Vals AI)87.9%Not measuredOnly GPT-6 Astra measured
Long context reasoning (AA-LCR)80.7%83.0%Muse Spark 1.3
DTBench97.3%96.5%GPT-6 Astra
LMCA64.4%53.9%GPT-6 Astra
Furniture assembly80.0%Not measuredOnly GPT-6 Astra measured
LMArena Text14411490Muse Spark 1.3
LMArena Text: instruction following14551479Muse Spark 1.3
LMArena Text: creative writing14201462Muse Spark 1.3
LMArena Vision12801308Muse Spark 1.3
LMArena Text: English14471495Muse Spark 1.3
LMArena Text: non-English14321481Muse Spark 1.3
LMArena Text: Chinese14891532Muse Spark 1.3
LMArena Text: German14591513Muse Spark 1.3
LMArena Text: Japanese14051470Muse Spark 1.3
LMArena Text: Korean14281490Muse Spark 1.3
LMArena Text: French14321511Muse Spark 1.3
LMArena Text: Spanish14221496Muse Spark 1.3
LMArena Text: Russian14381491Muse Spark 1.3
LMArena Text: Polish14221490Muse Spark 1.3
LMArena Text: multi-turn14471487Muse Spark 1.3
LMArena Text: longer queries14601488Muse Spark 1.3
LMArena Text: writing and language14371470Muse Spark 1.3
LMArena Text: entertainment and media14271457Muse Spark 1.3
LMArena Vision: English12801298Muse Spark 1.3
LMArena Vision: Chinese13611384Muse Spark 1.3
LMArena Vision: reading text12921319Muse Spark 1.3
LMArena Vision: humorNot measured1293Only Muse Spark 1.3 measured
LMArena Vision: creative writing12861296Muse 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-6 Astra and Muse Spark 1.3
BenchmarkGPT-6 AstraMuse 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-6 Astra$0.035Fits 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

GPT-6 Astra$0.650Fits 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

GPT-6 Astra$2.50Fits 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 GPT-6 Astra and Muse Spark 1.3
SpecificationOpenAI GPT-6 AstraMeta Muse Spark 1.3
MakerOpenAIMeta
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 4, 2026September 2, 2026
Context window1.05M1.05M
Input $/Mtok$10.00$1.25
Output $/Mtok$50.00$4.25
Coding index88.779.7
Independent measurements behind it22
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-6 Astra better than Muse Spark 1.3 for coding?

Pick GPT-6 Astra for coding: it scores 88.7 on the Vibe Coding Index against 79.7 for Muse Spark 1.3. Pick Muse Spark 1.3 when output tokens cost 11.8x less, or when what matters is CyberBench (Vals AI) or SciCode, where it leads.

Which is cheaper, GPT-6 Astra or Muse Spark 1.3?

GPT-6 Astra costs $10.00 per million input tokens and $50.00 per million output tokens; Muse Spark 1.3 costs $1.25 and $4.25. Cost per solved task is known for neither of them.

Which has the bigger context window, GPT-6 Astra or Muse Spark 1.3?

GPT-6 Astra, with 1.05M tokens against 1.05M.

How many benchmarks is the GPT-6 Astra vs Muse Spark 1.3 comparison based on?

91 benchmarks have a result for both models as of October 21, 2026. GPT-6 Astra's coding index rests on 2 independent benchmarks and Muse Spark 1.3's on 2. 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-6-astra-vs-meta-muse-spark-1-3">LLMBenchmark.ai, GPT-6 Astra vs Muse Spark 1.3</a></p>