GPT-6 Astra vs Muse Spark 1.1
GPT-6 Astra leads Muse Spark 1.1 on coding, 85.1 to 70.3 on the Vibe Coding Index, and Muse Spark 1.1 costs 11.8x less per output token ($4.25 vs $50.00 per million). Updated October 22, 2026; 83 benchmarks have a result for both.
GPT-6 Astra or Muse Spark 1.1: which to pick
Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 70.3 for Muse Spark 1.1.
Pick Muse Spark 1.1 for output tokens 11.8x cheaper ($4.25 vs $50.00 per million) and work measured by SciCode or LMArena Text: coding, where it leads.
- Shared results
- 83
- GPT-6 Astra only
- 46
- Muse Spark 1.1 only
- 21
- 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.
Coding
Vibe Coding Index, six public coding benchmarks
GPT-6 Astra
GPT-6 Astra scores 85.1 against 70.3.
5 and 3 benchmarks behind the scores
Intelligence
AA Intelligence Index
GPT-6 Astra
GPT-6 Astra leads, 52.7 against 33.7.
Same board, both measured
Agentic work
AA Agentic Index
GPT-6 Astra
GPT-6 Astra leads, 51.0 against 25.8.
Same board, both measured
Reasoning
GPQA Diamond
No call
Only Muse Spark 1.1 has a GPQA Diamond result, 91.2%.
Directional only
Knowledge
MMLU Pro
No call
Only Muse Spark 1.1 has a MMLU Pro result, 88.7%.
Directional only
Web design
Design Arena: websites
GPT-6 Astra
GPT-6 Astra leads, 1336 against 1270.
Same board, both measured
General
Vals Index
No call
Only GPT-6 Astra has a Vals Index result, 65.0%.
Directional only
Long documents
Listed context window
GPT-6 Astra
GPT-6 Astra takes 1.05M tokens against 1.05M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Muse Spark 1.1
GPT-6 Astra $0.035, Muse Spark 1.1 $0.0034 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Muse Spark 1.1 has the number, $0.43.
Directional only
At a glance
- Coding index
- GPT-6 Astra 85.1 from 5 benchmarks, Muse Spark 1.1 70.3 from 3 benchmarks.
- Widest category
- Agentic work, 28.2 points apart on average over 13 shared benchmarks.
- Widest single gap
- Time Horizon Index (Vals AI): GPT-6 Astra 90.5% against Muse Spark 1.1 1.7%, 88.8 points apart on a 0 to 100 scale.
- Output price
- GPT-6 Astra $50.00 against Muse Spark 1.1 $4.25 per million output tokens, 11.8x apart.
- Context window
- GPT-6 Astra takes 1.05M 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.
| Category | GPT-6 Astra | Bars | Muse Spark 1.1 | Ties |
|---|---|---|---|---|
| Coding | 11 | 3 | ||
| Intelligence | 2 | 0 | ||
| Agentic work | 12 | 1 | ||
| Reasoning | 5 | 3 | ||
| Math | 2 | 2 | ||
| Knowledge | 1 | 6 | ||
| Web design | 8 | 0 | ||
| General | 6 | 21 | ||
| All shared boards | 47 | 36 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index113
| Benchmark | GPT-6 Astra | Muse Spark 1.1 | Leader |
|---|---|---|---|
| LiveBench coding | 93.7% | Not measured | Only GPT-6 Astra measured |
| LMArena WebDev | 1774 | 1542 | GPT-6 Astra |
| AA Coding Index | 76.9 | 71.3 | GPT-6 Astra |
| LiveCodeBench (Vals AI) | Not measured | 85.9% | Only Muse Spark 1.1 measured |
| SWE-bench Verified (Vals AI) | Not measured | 82.0% | Only Muse Spark 1.1 measured |
| Terminal-Bench 4 (Vals AI) | 59.6% | Not measured | Only GPT-6 Astra measured |
| Vibe Code Bench (Vals AI) | 89.6% | 72.2% | GPT-6 Astra |
| Code migration (Vals AI) | 67.7% | 31.1% | GPT-6 Astra |
| ProgramBench (Vals AI) | 5.5% | 0.0% | GPT-6 Astra |
| IOI (Vals AI) | 100.0% | Not measured | Only GPT-6 Astra measured |
| Terminal-Bench 2.1 (Vals AI) | 87.3% | 69.3% | GPT-6 Astra |
| SWE-bench Multimodal (Vals AI) | 43.3% | Not measured | Only GPT-6 Astra measured |
| Vibe Code Bench 1-100 (Vals AI) | 27.6% | Not measured | Only GPT-6 Astra measured |
| SkillsBench (Vals AI) | Not measured | 59.2% | Only Muse Spark 1.1 measured |
| CyberBench (Vals AI) | 41.1% | Not measured | Only GPT-6 Astra measured |
| SciCode | 56.5% | 58.8% | Muse Spark 1.1 |
| FrontierCode | 53.3% | Not measured | Only GPT-6 Astra measured |
| FrontierSWE | 65.5% | Not measured | Only GPT-6 Astra measured |
| GSO-Bench | 79.4% | Not measured | Only GPT-6 Astra measured |
| WeirdML | 93.3% | Not measured | Only GPT-6 Astra measured |
| MirrorCode | 46.7% | Not measured | Only GPT-6 Astra measured |
| ALE-Bench | 2951.3 | Not measured | Only GPT-6 Astra measured |
| LMArena Text: coding | 1489 | 1498 | Muse Spark 1.1 |
| LMArena Text: software and IT | 1474 | 1498 | Muse Spark 1.1 |
| LMArena WebDev: React | 1798 | 1532 | GPT-6 Astra |
| LMArena WebDev: HTML | 1775 | 1540 | GPT-6 Astra |
| LMArena WebDev: from an image | 1726 | 1540 | GPT-6 Astra |
| SciCode | 12.3% | Not measured | Only GPT-6 Astra measured |
| SWE-Bench Pro V2 | 96.9% | Not measured | Only GPT-6 Astra measured |
| SWE Atlas: Codebase QnA | 59.1% | 42.2% | GPT-6 Astra |
| SWE Atlas: Refactoring | 59.1% | Not measured | Only GPT-6 Astra measured |
| SWE Atlas: Test Writing | 50.7% | 41.5% | GPT-6 Astra |
| Neither model has a result on the other 11 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | GPT-6 Astra | Muse Spark 1.1 | Leader |
|---|---|---|---|
| AA Intelligence Index | 52.7 | 33.7 | GPT-6 Astra |
| Epoch Capabilities Index | 168.8 | 154.1 | GPT-6 Astra |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index121
| Benchmark | GPT-6 Astra | Muse Spark 1.1 | Leader |
|---|---|---|---|
| AA Agentic Index | 51.0 | 25.8 | GPT-6 Astra |
| Design Arena: agents building web apps | 1374 | 1207 | GPT-6 Astra |
| Design Arena: agents building full-stack apps | 1357 | 1199 | GPT-6 Astra |
| Design Arena: agents building mobile apps | 1312 | 1175 | GPT-6 Astra |
| Design Arena: agents building Android apps | Not measured | 1178 | Only Muse Spark 1.1 measured |
| Design Arena: agents building Godot games | 1348 | 1103 | GPT-6 Astra |
| Design Arena: agents building games | Not measured | 1183 | Only Muse Spark 1.1 measured |
| Design Arena: HTML slides | Not measured | 1145 | Only Muse Spark 1.1 measured |
| Design Arena: PowerPoint slides | 1217 | 1134 | GPT-6 Astra |
| Design Arena: spreadsheets | 1378 | 1021 | GPT-6 Astra |
| LiveBench research | 85.2% | Not measured | Only GPT-6 Astra measured |
| LiveBench browser | 84.0% | Not measured | Only GPT-6 Astra measured |
| LiveBench long agentic | 82.4% | Not measured | Only GPT-6 Astra measured |
| SREBench (Vals AI) | 56.9% | Not measured | Only GPT-6 Astra measured |
| Finance Agent (Vals AI) | 53.5% | 57.2% | Muse Spark 1.1 |
| Tax Agent Bench (Vals AI) | 20.7% | Not measured | Only GPT-6 Astra measured |
| Legal Research Bench (Vals AI) | 39.4% | 38.0% | GPT-6 Astra |
| Harvey's Legal Agent Benchmark (Vals AI) | 7.1% | Not measured | Only GPT-6 Astra measured |
| Excel Modeling Benchmark (Vals AI) | 71.7% | 56.4% | GPT-6 Astra |
| BioMysteryBench (Vals AI) | 79.3% | Not measured | Only GPT-6 Astra measured |
| Terminal-Bench-Science (Vals AI) | 62.9% | Not measured | Only GPT-6 Astra measured |
| Vals Science Index | 65.1% | Not measured | Only GPT-6 Astra measured |
| Time Horizon Index (Vals AI) | 90.5% | 1.7% | GPT-6 Astra |
| CUA-bench (Vals AI) | 19.2% | Not measured | Only GPT-6 Astra measured |
| Robo-bench (Vals AI) | 23.3% | Not measured | Only GPT-6 Astra measured |
| APEX-Agents | 64.7% | 31.8% | GPT-6 Astra |
| Remote Labor Index | 20.8% | Not measured | Only GPT-6 Astra measured |
| BALROG | 68.3% | Not measured | Only GPT-6 Astra measured |
| SpireClimb | 25.7% | Not measured | Only GPT-6 Astra measured |
| Vending-Bench 2 | $15,515 | $6,520 | GPT-6 Astra |
| MCP Atlas | Not measured | 88.1% | Only Muse Spark 1.1 measured |
| Neither model has a result on the other 11 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index53
| Benchmark | GPT-6 Astra | Muse Spark 1.1 | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 91.2% | Only Muse Spark 1.1 measured |
| LiveBench reasoning | 92.7% | Not measured | Only GPT-6 Astra measured |
| MysteryMechanism (Vals AI) | 53.1% | Not measured | Only GPT-6 Astra measured |
| MMMU Pro (Vals AI) | Not measured | 86.6% | Only Muse Spark 1.1 measured |
| GPQA Diamond (Artificial Analysis run) | 96.3% | 89.8% | GPT-6 Astra |
| Humanity's Last Exam (Artificial Analysis run) | 54.7% | 46.2% | GPT-6 Astra |
| GPQA Diamond (Epoch AI run) | 95.8% | Not measured | Only GPT-6 Astra measured |
| ARC-AGI | 98.5% | Not measured | Only GPT-6 Astra measured |
| ARC-AGI-2 | 95.0% | Not measured | Only GPT-6 Astra measured |
| Chess puzzles | 74.0% | 34.0% | GPT-6 Astra |
| Mystery game puzzles | 84.0% | Not measured | Only GPT-6 Astra measured |
| EBR-bench | 76.2% | Not measured | Only GPT-6 Astra measured |
| LMArena Text: hard prompts | 1463 | 1485 | Muse Spark 1.1 |
| LMArena Text: expert | 1489 | 1478 | GPT-6 Astra |
| LMArena Text: hard prompts in English | 1464 | 1480 | Muse Spark 1.1 |
| LMArena Vision: diagrams | 1297 | 1305 | Muse Spark 1.1 |
| LMArena Vision: homework | 1337 | 1287 | GPT-6 Astra |
| Humanity's Last Exam (Scale run) | 60.6% | Not measured | Only GPT-6 Astra measured |
| Neither model has a result on the other 5 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index22
| Benchmark | GPT-6 Astra | Muse Spark 1.1 | Leader |
|---|---|---|---|
| OTIS Mock AIME | 100.0% | Not measured | Only GPT-6 Astra measured |
| FrontierMath, tiers 1 to 3 | 93.7% | Not measured | Only GPT-6 Astra measured |
| FrontierMath, tier 4 | 97.6% | Not measured | Only GPT-6 Astra measured |
| ProofBench | 99.0% | 39.0% | GPT-6 Astra |
| LMArena Text: math | 1465 | 1482 | Muse Spark 1.1 |
| LMArena Text: mathematical work | 1484 | 1487 | Muse Spark 1.1 |
| MathArena | 81.9% | 42.5% | GPT-6 Astra |
| Neither model has a result on the other 7 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index16
| Benchmark | GPT-6 Astra | Muse Spark 1.1 | Leader |
|---|---|---|---|
| MMLU Pro | Not measured | 88.7% | Only Muse Spark 1.1 measured |
| LegalBench (Vals AI) | Not measured | 85.0% | Only Muse Spark 1.1 measured |
| CorpFin (Vals AI) | Not measured | 71.3% | Only Muse Spark 1.1 measured |
| TaxEval (Vals AI) | Not measured | 79.7% | Only Muse Spark 1.1 measured |
| MortgageTax (Vals AI) | Not measured | 66.1% | Only Muse Spark 1.1 measured |
| MedCode (Vals AI) | 48.5% | Not measured | Only GPT-6 Astra measured |
| SimpleQA Verified | 75.6% | 57.8% | GPT-6 Astra |
| LMArena Text: science | 1451 | 1484 | Muse Spark 1.1 |
| LMArena Text: medicine and healthcare | 1425 | 1479 | Muse Spark 1.1 |
| LMArena Text: legal and government | 1462 | 1481 | Muse Spark 1.1 |
| LMArena Text: business and finance | 1439 | 1470 | Muse Spark 1.1 |
| FACTS Benchmark Suite | 75.7% | Not measured | Only GPT-6 Astra measured |
| PRBench Finance | 47.5% | 55.0% | Muse Spark 1.1 |
| PRBench Legal | 48.4% | 57.0% | Muse Spark 1.1 |
| Neither model has a result on the other 6 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index80
| Benchmark | GPT-6 Astra | Muse Spark 1.1 | Leader |
|---|---|---|---|
| Design Arena: websites | 1336 | 1270 | GPT-6 Astra |
| Design Arena: UI components | 1394 | 1287 | GPT-6 Astra |
| Design Arena: game dev | 1480 | 1269 | GPT-6 Astra |
| Design Arena: data viz | 1334 | 1267 | GPT-6 Astra |
| Design Arena: 3D | 1500 | 1259 | GPT-6 Astra |
| Design Arena: all code categories | 1379 | 1276 | GPT-6 Astra |
| Design Arena: SVG | 1430 | 1234 | GPT-6 Astra |
| Design Arena: ASCII art | 1353 | 1269 | GPT-6 Astra |
| LiveBench design | 82.0% | Not measured | Only GPT-6 Astra measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index621
| Benchmark | GPT-6 Astra | Muse Spark 1.1 | Leader |
|---|---|---|---|
| Vals Index | 65.0% | Not measured | Only GPT-6 Astra measured |
| LiveBench data analysis | 83.0% | Not measured | Only GPT-6 Astra measured |
| Public Benefits Bench (Vals AI) | Not measured | 61.3% | Only Muse Spark 1.1 measured |
| SAGE (Vals AI) | 46.4% | 45.6% | GPT-6 Astra |
| MedScribe (Vals AI) | 87.9% | 88.9% | Muse Spark 1.1 |
| Vals Multimodal Index | Not measured | 66.7% | Only Muse Spark 1.1 measured |
| Long context reasoning (AA-LCR) | 80.7% | 77.7% | GPT-6 Astra |
| DTBench | 97.3% | 94.4% | GPT-6 Astra |
| LMCA | 64.4% | 49.9% | GPT-6 Astra |
| Surface Evolver Bench | Not measured | 52.5% | Only Muse Spark 1.1 measured |
| Furniture assembly | 80.0% | Not measured | Only GPT-6 Astra measured |
| LMArena Text | 1441 | 1478 | Muse Spark 1.1 |
| LMArena Text: instruction following | 1455 | 1457 | Muse Spark 1.1 |
| LMArena Text: creative writing | 1420 | 1435 | Muse Spark 1.1 |
| LMArena Vision | 1280 | 1293 | Muse Spark 1.1 |
| LMArena Text: English | 1447 | 1478 | Muse Spark 1.1 |
| LMArena Text: non-English | 1432 | 1471 | Muse Spark 1.1 |
| LMArena Text: Chinese | 1489 | 1515 | Muse Spark 1.1 |
| LMArena Text: German | 1459 | 1469 | Muse Spark 1.1 |
| LMArena Text: Japanese | 1405 | 1450 | Muse Spark 1.1 |
| LMArena Text: Korean | 1428 | 1459 | Muse Spark 1.1 |
| LMArena Text: French | 1432 | 1492 | Muse Spark 1.1 |
| LMArena Text: Spanish | 1422 | 1464 | Muse Spark 1.1 |
| LMArena Text: Russian | 1438 | 1482 | Muse Spark 1.1 |
| LMArena Text: Polish | 1422 | 1499 | Muse Spark 1.1 |
| LMArena Text: multi-turn | 1447 | 1484 | Muse Spark 1.1 |
| LMArena Text: longer queries | 1460 | 1462 | Muse Spark 1.1 |
| LMArena Text: writing and language | 1437 | 1448 | Muse Spark 1.1 |
| LMArena Text: entertainment and media | 1427 | 1438 | Muse Spark 1.1 |
| LMArena Vision: English | 1280 | 1292 | Muse Spark 1.1 |
| LMArena Vision: Chinese | 1361 | 1348 | GPT-6 Astra |
| LMArena Vision: reading text | 1292 | 1301 | Muse Spark 1.1 |
| LMArena Vision: humor | Not measured | 1288 | Only Muse Spark 1.1 measured |
| LMArena Vision: creative writing | 1286 | 1253 | GPT-6 Astra |
| LMArena Document | Not measured | 1465 | Only Muse Spark 1.1 measured |
| MultiChallenge | Not measured | 75.3% | Only Muse Spark 1.1 measured |
| EQ-Bench 4 | Not measured | 1260 | Only Muse Spark 1.1 measured |
| Neither model has a result on the other 11 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | GPT-6 Astra | Muse Spark 1.1 | Leader |
|---|---|---|---|
| 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
Muse Spark 1.1 costs less
Repository review
50K input + 3K output tokens
Muse Spark 1.1 costs less
Agent loop
200K input + 10K output tokens
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.
| Specification | OpenAI GPT-6 Astra | Meta Muse Spark 1.1 |
|---|---|---|
| Maker | OpenAI | Meta |
| Weights | No public weights listed | No public weights listed |
| Released | September 4, 2026 | July 16, 2026 |
| Context window | 1.05M | 1.05M |
| Input $/Mtok | $10.00 | $1.25 |
| Output $/Mtok | $50.00 | $4.25 |
| Coding index | 85.1 | 70.3 |
| Independent measurements behind it | 5 | 3 |
| Cost per solved task | Not computable | $0.43 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is GPT-6 Astra better than Muse Spark 1.1 for coding?
Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 70.3 for Muse Spark 1.1. Pick Muse Spark 1.1 for output tokens 11.8x cheaper ($4.25 vs $50.00 per million) and work measured by SciCode or LMArena Text: coding, where it leads.
Which is cheaper, GPT-6 Astra or Muse Spark 1.1?
GPT-6 Astra costs $10.00 per million input tokens and $50.00 per million output tokens; Muse Spark 1.1 costs $1.25 and $4.25. Cost per solved task is known for Muse Spark 1.1 only.
Which has the bigger context window, GPT-6 Astra or Muse Spark 1.1?
GPT-6 Astra, with 1.05M tokens against 1.05M.
How many benchmarks is the GPT-6 Astra vs Muse Spark 1.1 comparison based on?
83 benchmarks have a result for both models as of October 22, 2026. GPT-6 Astra's coding index rests on 5 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.