Muse Spark 1.2 vs o4 Mini
Muse Spark 1.2 leads o4 Mini on the Artificial Analysis Intelligence Index, 39.6 to 16.7, at about the same output price ($4.25 vs $4.40 per million). Updated October 21, 2026; 55 benchmarks have a result for both.
vs boards won of 55 shared
Muse Spark 1.2 or o4 Mini: which to pick
Only Muse Spark 1.2 has a coding score, 55.7 on the Vibe Coding Index; o4 Mini has none, so the two cannot be ranked on coding.
Compare them on price, context and the boards below.
Model AMuse Spark 1.2Meta55.7/1005 independent benchmarks$0.64 per solved taskModel Bo4 MiniOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
- Shared results
- 55
- Muse Spark 1.2 only
- 42
- o4 Mini only
- 43
- 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.
Coding
Vibe Coding Index, six public coding benchmarks
No call
Only Muse Spark 1.2 has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
Muse Spark 1.2
Muse Spark 1.2 leads, 39.6 against 16.7.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Muse Spark 1.2 has a AA Agentic Index result, 43.2.
Directional only
Reasoning
GPQA Diamond
No call
Only o4 Mini has a GPQA Diamond result, 74.5%.
Directional only
Math
AIME
No call
Only o4 Mini has a AIME result, 83.7%.
Directional only
Knowledge
MMLU Pro
Muse Spark 1.2
Muse Spark 1.2 leads, 88.3% against 80.6%.
Same board, both measured
Web design
Design Arena: websites
Muse Spark 1.2
Muse Spark 1.2 leads, 1313 against 985.
Same board, both measured
Long documents
Listed context window
Muse Spark 1.2
Muse Spark 1.2 takes 1.05M tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
o4 Mini
Muse Spark 1.2 $0.0034, o4 Mini $0.0033 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Muse Spark 1.2 has the number, $0.64.
Directional only
At a glance
- Coding index
- Muse Spark 1.2 55.7 from 5 benchmarks, o4 Mini not benchmarked.
- Widest category
- Web design, 43.2 points apart on average over 6 shared benchmarks.
- Widest single gap
- Design Arena: 3D: Muse Spark 1.2 1302 against o4 Mini 854, 56.0 points apart on a 0 to 100 scale.
- Output price
- Muse Spark 1.2 $4.25 against o4 Mini $4.40 per million output tokens, 1.0x apart.
- Context window
- Muse Spark 1.2 takes 1.05M tokens, o4 Mini 200K.
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 | Muse Spark 1.2 | Bars | o4 Mini | Ties |
|---|---|---|---|---|
| Coding | 3 | 0 | ||
| Intelligence | 2 | 0 | ||
| Reasoning | 9 | 0 | ||
| Math | 2 | 0 | ||
| Knowledge | 11 | 0 | ||
| Web design | 6 | 0 | ||
| General | 22 | 0 | ||
| All shared boards | 55 | 0 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index30
| Benchmark | Muse Spark 1.2 | o4 Mini | Leader |
|---|---|---|---|
| Aider polyglot | Not measured | 72.0% | Only o4 Mini measured |
| SWE-bench Verified | Not measured | 64.6% | Only o4 Mini measured |
| SWE-bench Multimodal | Not measured | 33.9% | Only o4 Mini measured |
| LiveBench coding | 78.2% | Not measured | Only Muse Spark 1.2 measured |
| LMArena WebDev | 1534 | Not measured | Only Muse Spark 1.2 measured |
| AA Coding Index | 72.2 | Not measured | Only Muse Spark 1.2 measured |
| LiveCodeBench (Vals AI) | Not measured | 82.2% | Only o4 Mini measured |
| SWE-bench Verified (Vals AI) | 86.6% | Not measured | Only Muse Spark 1.2 measured |
| Terminal-Bench 4 (Vals AI) | 6.1% | Not measured | Only Muse Spark 1.2 measured |
| Vibe Code Bench (Vals AI) | 79.1% | Not measured | Only Muse Spark 1.2 measured |
| Code migration (Vals AI) | 29.9% | Not measured | Only Muse Spark 1.2 measured |
| ProgramBench (Vals AI) | 0.5% | Not measured | Only Muse Spark 1.2 measured |
| IOI (Vals AI) | 21.8% | Not measured | Only Muse Spark 1.2 measured |
| Terminal-Bench 2.1 (Vals AI) | 69.7% | Not measured | Only Muse Spark 1.2 measured |
| SkillsBench (Vals AI) | 53.0% | Not measured | Only Muse Spark 1.2 measured |
| CyberBench (Vals AI) | 69.5% | Not measured | Only Muse Spark 1.2 measured |
| LiveCodeBench (Artificial Analysis run) | Not measured | 85.9% | Only o4 Mini measured |
| SciCode | 57.4% | Not measured | Only Muse Spark 1.2 measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 15.2% | Only o4 Mini measured |
| FrontierSWE | 12.0% | Not measured | Only Muse Spark 1.2 measured |
| GSO-Bench | Not measured | 3.6% | Only o4 Mini measured |
| WeirdML | 60.3% | 52.6% | Muse Spark 1.2 |
| LMArena Text: coding | 1505 | 1368 | Muse Spark 1.2 |
| LMArena Text: software and IT | 1505 | 1367 | Muse Spark 1.2 |
| LMArena WebDev: React | 1526 | Not measured | Only Muse Spark 1.2 measured |
| LMArena WebDev: HTML | 1543 | Not measured | Only Muse Spark 1.2 measured |
| SciCode | Not measured | 10.8% | Only o4 Mini measured |
| Neither model has a result on the other 12 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Muse Spark 1.2 | o4 Mini | Leader |
|---|---|---|---|
| AA Intelligence Index | 39.6 | 16.7 | Muse Spark 1.2 |
| Epoch Capabilities Index | 155.1 | 145.5 | Muse Spark 1.2 |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index21 boards, none shared
| Benchmark | Muse Spark 1.2 | o4 Mini | Leader |
|---|---|---|---|
| AA Agentic Index | 43.2 | Not measured | Only Muse Spark 1.2 measured |
| Design Arena: agents building web apps | 1221 | Not measured | Only Muse Spark 1.2 measured |
| Design Arena: agents building full-stack apps | 1210 | Not measured | Only Muse Spark 1.2 measured |
| Design Arena: agents building mobile apps | 1181 | Not measured | Only Muse Spark 1.2 measured |
| Design Arena: agents building Android apps | 1221 | Not measured | Only Muse Spark 1.2 measured |
| Design Arena: agents building games | 1179 | Not measured | Only Muse Spark 1.2 measured |
| Design Arena: HTML slides | 1135 | Not measured | Only Muse Spark 1.2 measured |
| Design Arena: PowerPoint slides | 1198 | Not measured | Only Muse Spark 1.2 measured |
| LiveBench research | 67.7% | Not measured | Only Muse Spark 1.2 measured |
| LiveBench browser | 36.0% | Not measured | Only Muse Spark 1.2 measured |
| LiveBench long agentic | 21.3% | Not measured | Only Muse Spark 1.2 measured |
| SREBench (Vals AI) | 0.0% | Not measured | Only Muse Spark 1.2 measured |
| Finance Agent (Vals AI) | 60.6% | Not measured | Only Muse Spark 1.2 measured |
| Tax Agent Bench (Vals AI) | 32.8% | Not measured | Only Muse Spark 1.2 measured |
| Legal Research Bench (Vals AI) | 43.8% | Not measured | Only Muse Spark 1.2 measured |
| Excel Modeling Benchmark (Vals AI) | 57.0% | Not measured | Only Muse Spark 1.2 measured |
| BioMysteryBench (Vals AI) | 64.8% | Not measured | Only Muse Spark 1.2 measured |
| τ²-Bench Telecom | Not measured | 55.6% | Only o4 Mini measured |
| APEX-Agents | 45.4% | Not measured | Only Muse Spark 1.2 measured |
| METR time horizons | Not measured | 63.9% | Only o4 Mini measured |
| Berkeley Function Calling Leaderboard (BFCL) | Not measured | 53.2% | Only o4 Mini measured |
| Neither model has a result on the other 20 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index90
| Benchmark | Muse Spark 1.2 | o4 Mini | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 74.5% | Only o4 Mini measured |
| LiveBench reasoning | 90.0% | Not measured | Only Muse Spark 1.2 measured |
| MMMU Pro (Vals AI) | 86.1% | 79.7% | Muse Spark 1.2 |
| GPQA Diamond (Artificial Analysis run) | 90.4% | 78.4% | Muse Spark 1.2 |
| Humanity's Last Exam (Artificial Analysis run) | 45.5% | 16.5% | Muse Spark 1.2 |
| GPQA Diamond (Epoch AI run) | Not measured | 79.6% | Only o4 Mini measured |
| ARC-AGI | Not measured | 58.7% | Only o4 Mini measured |
| ARC-AGI-2 | Not measured | 6.1% | Only o4 Mini measured |
| SimpleBench | 74.5% | 38.7% | Muse Spark 1.2 |
| Chess puzzles | 27.0% | 22.0% | Muse Spark 1.2 |
| Mystery game puzzles | Not measured | 5.0% | Only o4 Mini measured |
| VPCT | Not measured | 57.5% | Only o4 Mini measured |
| LMArena Text: hard prompts | 1489 | 1351 | Muse Spark 1.2 |
| LMArena Text: expert | 1475 | 1343 | Muse Spark 1.2 |
| LMArena Text: hard prompts in English | 1487 | 1366 | Muse Spark 1.2 |
| LMArena Vision: diagrams | 1317 | 1197 | Muse Spark 1.2 |
| LMArena Vision: homework | Not measured | 1234 | Only o4 Mini measured |
| Kagi LLM Benchmark | Not measured | 67.6% | Only o4 Mini measured |
| Neither model has a result on the other 4 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Muse Spark 1.2 | o4 Mini | Leader |
|---|---|---|---|
| AIME | Not measured | 83.7% | Only o4 Mini measured |
| MATH 500 (Vals AI) | Not measured | 94.2% | Only o4 Mini measured |
| MGSM (Vals AI) | Not measured | 93.4% | Only o4 Mini measured |
| AA Math Index | Not measured | 90.7 | Only o4 Mini measured |
| AIME 2025 (Artificial Analysis run) | Not measured | 90.7% | Only o4 Mini measured |
| OTIS Mock AIME | Not measured | 81.7% | Only o4 Mini measured |
| FrontierMath, tiers 1 to 3 | Not measured | 36.1% | Only o4 Mini measured |
| FrontierMath, tier 4 | Not measured | 4.9% | Only o4 Mini measured |
| ProofBench | 43.0% | Not measured | Only Muse Spark 1.2 measured |
| MATH level 5 | Not measured | 97.8% | Only o4 Mini measured |
| LMArena Text: math | 1484 | 1389 | Muse Spark 1.2 |
| LMArena Text: mathematical work | 1480 | 1379 | Muse Spark 1.2 |
| Neither model has a result on the other 1 board here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
| Benchmark | Muse Spark 1.2 | o4 Mini | Leader |
|---|---|---|---|
| MMLU Pro | 88.3% | 80.6% | Muse Spark 1.2 |
| LegalBench (Vals AI) | 85.3% | 79.2% | Muse Spark 1.2 |
| CorpFin (Vals AI) | 70.9% | 59.0% | Muse Spark 1.2 |
| TaxEval (Vals AI) | 80.4% | 74.8% | Muse Spark 1.2 |
| MortgageTax (Vals AI) | 65.4% | 64.8% | Muse Spark 1.2 |
| MedQA (Vals AI) | Not measured | 96.0% | Only o4 Mini measured |
| MedCode (Vals AI) | 49.4% | 33.8% | Muse Spark 1.2 |
| MMLU Pro (Artificial Analysis run) | Not measured | 83.2% | Only o4 Mini measured |
| SimpleQA Verified | 60.3% | 19.6% | Muse Spark 1.2 |
| GeoBench | Not measured | 64.0% | Only o4 Mini measured |
| LMArena Text: science | 1500 | 1354 | Muse Spark 1.2 |
| LMArena Text: medicine and healthcare | 1496 | 1361 | Muse Spark 1.2 |
| LMArena Text: legal and government | 1517 | 1350 | Muse Spark 1.2 |
| LMArena Text: business and finance | 1484 | 1325 | Muse Spark 1.2 |
| FACTS Benchmark Suite | Not measured | 28.1% | Only o4 Mini measured |
| Neither model has a result on the other 3 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index60
| Benchmark | Muse Spark 1.2 | o4 Mini | Leader |
|---|---|---|---|
| Design Arena: websites | 1313 | 985 | Muse Spark 1.2 |
| Design Arena: UI components | 1301 | 983 | Muse Spark 1.2 |
| Design Arena: game dev | 1301 | 1003 | Muse Spark 1.2 |
| Design Arena: data viz | 1334 | 990 | Muse Spark 1.2 |
| Design Arena: 3D | 1302 | 854 | Muse Spark 1.2 |
| Design Arena: all code categories | 1313 | 976 | Muse Spark 1.2 |
| Design Arena: SVG | 1286 | Not measured | Only Muse Spark 1.2 measured |
| Design Arena: ASCII art | 1283 | Not measured | Only Muse Spark 1.2 measured |
| LiveBench design | 67.1% | Not measured | Only Muse Spark 1.2 measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index220
| Benchmark | Muse Spark 1.2 | o4 Mini | Leader |
|---|---|---|---|
| LiveBench data analysis | 76.5% | Not measured | Only Muse Spark 1.2 measured |
| Public Benefits Bench (Vals AI) | 68.5% | Not measured | Only Muse Spark 1.2 measured |
| SAGE (Vals AI) | 47.7% | 41.1% | Muse Spark 1.2 |
| MedScribe (Vals AI) | 90.1% | 69.1% | Muse Spark 1.2 |
| Vals Multimodal Index | 69.8% | Not measured | Only Muse Spark 1.2 measured |
| IFBench | Not measured | 68.7% | Only o4 Mini measured |
| Long context reasoning (AA-LCR) | 79.0% | 61.0% | Muse Spark 1.2 |
| DTBench | 94.7% | 77.6% | Muse Spark 1.2 |
| LMCA | 48.4% | 26.5% | Muse Spark 1.2 |
| Fiction.LiveBench | Not measured | 77.8% | Only o4 Mini measured |
| Creative writing (Lech Mazur) | Not measured | 75.0% | Only o4 Mini measured |
| LMArena Text | 1482 | 1353 | Muse Spark 1.2 |
| LMArena Text: instruction following | 1462 | 1320 | Muse Spark 1.2 |
| LMArena Text: creative writing | 1436 | 1294 | Muse Spark 1.2 |
| LMArena Vision | 1304 | 1194 | Muse Spark 1.2 |
| LMArena Text: English | 1483 | 1367 | Muse Spark 1.2 |
| LMArena Text: non-English | 1476 | 1337 | Muse Spark 1.2 |
| LMArena Text: Chinese | 1509 | 1354 | Muse Spark 1.2 |
| LMArena Text: German | Not measured | 1336 | Only o4 Mini measured |
| LMArena Text: Japanese | Not measured | 1308 | Only o4 Mini measured |
| LMArena Text: Korean | 1462 | 1312 | Muse Spark 1.2 |
| LMArena Text: French | 1495 | 1364 | Muse Spark 1.2 |
| LMArena Text: Spanish | 1484 | 1346 | Muse Spark 1.2 |
| LMArena Text: Russian | 1483 | 1334 | Muse Spark 1.2 |
| LMArena Text: Polish | Not measured | 1358 | Only o4 Mini measured |
| LMArena Text: multi-turn | 1502 | 1350 | Muse Spark 1.2 |
| LMArena Text: longer queries | 1473 | 1315 | Muse Spark 1.2 |
| LMArena Text: writing and language | 1453 | 1316 | Muse Spark 1.2 |
| LMArena Text: entertainment and media | 1443 | 1308 | Muse Spark 1.2 |
| LMArena Vision: English | 1291 | 1200 | Muse Spark 1.2 |
| LMArena Vision: Chinese | Not measured | 1218 | Only o4 Mini measured |
| LMArena Vision: reading text | 1313 | 1197 | Muse Spark 1.2 |
| LMArena Vision: humor | Not measured | 1199 | Only o4 Mini measured |
| LMArena Vision: captioning | Not measured | 1204 | Only o4 Mini measured |
| LMArena Vision: recognizing things | Not measured | 1218 | Only o4 Mini measured |
| LMArena Vision: creative writing | Not measured | 1166 | Only o4 Mini measured |
| Neither model has a result on the other 10 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Muse Spark 1.2 | o4 Mini | 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 1.2$0.0034Fits in one request
o4 Mini$0.0033Fits in one request
o4 Mini costs less
Repository review
50K input + 3K output tokens
Muse Spark 1.2$0.075Fits in one request
o4 Mini$0.068Fits in one request
o4 Mini costs less
Agent loop
200K input + 10K output tokens
Muse Spark 1.2$0.292Fits in one request
o4 Mini$0.264Exceeds the context window
o4 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.
| Specification | Meta Muse Spark 1.2 | OpenAI o4 Mini |
|---|---|---|
| Maker | Meta | OpenAI |
| Weights | No public weights listed | No public weights listed |
| Released | August 5, 2026 | April 16, 2025 |
| Context window | 1.05M | 200K |
| Input $/Mtok | $1.25 | $1.10 |
| Output $/Mtok | $4.25 | $4.40 |
| Coding index | 55.7 | Not benchmarked |
| Independent measurements behind it | 5 | 0 |
| Cost per solved task | $0.64 | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Muse Spark 1.2 better than o4 Mini for coding?
Only Muse Spark 1.2 has a coding score, 55.7 on the Vibe Coding Index; o4 Mini has none, so the two cannot be ranked on coding. Compare them on price, context and the boards below.
Which is cheaper, Muse Spark 1.2 or o4 Mini?
Muse Spark 1.2 costs $1.25 per million input tokens and $4.25 per million output tokens; o4 Mini costs $1.10 and $4.40. Cost per solved task is known for Muse Spark 1.2 only.
Which has the bigger context window, Muse Spark 1.2 or o4 Mini?
Muse Spark 1.2, with 1.05M tokens against 200K.
How many benchmarks is the Muse Spark 1.2 vs o4 Mini comparison based on?
55 benchmarks have a result for both models as of October 21, 2026. Muse Spark 1.2's coding index rests on 5 independent benchmarks and o4 Mini's on 0. Where only one model has a result, the page says so instead of naming a winner.