Model comparison
Muse Spark 1.2 vs o3-pro
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 42.9 on the Noometry Index.
Last verified . 4 shared benchmarks.
MetaSummary
- They share 4 benchmarks with published results for both. Muse Spark 1.2 scores higher in 3 categories and o3-pro in 2 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Muse Spark 1.2 leads 51.3 to 23.8.
- The biggest single-benchmark swing is LMCA: 48.4% for Muse Spark 1.2 and 38.5% for o3-pro.
- Muse Spark 1.2 is cheaper at $1.25 / $4.25 per million input/output tokens, against $20 / $80 for o3-pro.
- Muse Spark 1.2 accepts more context: 1.05M tokens versus 200K.
Side by side
| Muse Spark 1.2 | o3-pro | |
|---|---|---|
| Provider | Meta | OpenAI |
| Noometry Index | 50.3 | 42.9 |
| Released | 2026-08-05 | 2025-06-10 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 200K |
| Max output | 131K | 100K |
| Input $ / M tokens | $1.25 | $20 |
| Output $ / M tokens | $4.25 | $80 |
| Results tracked | 31 | 12 |
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Category by category
Coding o3-pro leads
Muse Spark 1.2: 49.2 (#51), o3-pro: 55.5 (#24)
| Benchmark | Muse Spark 1.2 | o3-pro |
|---|---|---|
| WeirdML | 60.3% | 58.2% |
| DeepSWE | 54.9% | — |
| Aider Polyglot | — | 84.9% |
| LMArena WebDev | 1533 | — |
| FrontierSWE | 12% | — |
| SciCode | 56.4% | — |
| LMArena Coding | 1495 | — |
Agentic & Tool Use Not comparable
Muse Spark 1.2: 29.4 (#87), o3-pro: —
| Benchmark | Muse Spark 1.2 | o3-pro |
|---|---|---|
| APEX-Agents | 36.4% | — |
| GDP.pdf | 16% | — |
Reasoning Muse Spark 1.2 leads
Muse Spark 1.2: 51.3 (#34), o3-pro: 23.8 (#171)
| Benchmark | Muse Spark 1.2 | o3-pro |
|---|---|---|
| DTBench | 94.7% | 86.9% |
| LMCA | 48.4% | 38.5% |
| Epoch Capabilities Index | 154.87 | 147.42 |
| ARC-AGI-2 | — | 4.9% |
| SimpleBench | 74.5% | — |
| Kagi LLM Benchmark | — | 72.1% |
| NYT Connections (extended) | 79.2% | — |
| ARC-AGI-1 | — | 59.3% |
| CritPt | 17.7% | — |
| LMArena Hard Prompts | 1486 | — |
Math Not comparable
Muse Spark 1.2: 46.4 (#70), o3-pro: —
| Benchmark | Muse Spark 1.2 | o3-pro |
|---|---|---|
| ProofBench | 43% | — |
| LMArena Math | 1471 | — |
Knowledge Muse Spark 1.2 leads
Muse Spark 1.2: 54.1 (#53), o3-pro: 29.5 (#238)
| Benchmark | Muse Spark 1.2 | o3-pro |
|---|---|---|
| SimpleQA Verified | 60.3% | — |
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |
| LMArena Expert | 1480 | — |
Multimodal Not comparable
Muse Spark 1.2: 43.4 (#25), o3-pro: —
| Benchmark | Muse Spark 1.2 | o3-pro |
|---|---|---|
| LMArena Vision | 1305 | — |
Multilingual Not comparable
Muse Spark 1.2: 57.1 (#11), o3-pro: —
| Benchmark | Muse Spark 1.2 | o3-pro |
|---|---|---|
| LMArena Non-English | 1478 | — |
| LMArena Chinese | 1511 | — |
| LMArena French | 1513 | — |
| LMArena Russian | 1487 | — |
| LMArena Spanish | 1498 | — |
Instruction Following Not comparable
Muse Spark 1.2: 76.7 (#36), o3-pro: —
| Benchmark | Muse Spark 1.2 | o3-pro |
|---|---|---|
| LMArena Instruction Following | 1461 | — |
Long Context o3-pro leads
Muse Spark 1.2: 45.2 (#48), o3-pro: 72.2 (#1)
| Benchmark | Muse Spark 1.2 | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
| LMArena Longer Query | 1475 | — |
Writing & Preference Muse Spark 1.2 leads
Muse Spark 1.2: 72.3 (#14), o3-pro: 57.1 (#133)
| Benchmark | Muse Spark 1.2 | o3-pro |
|---|---|---|
| LMArena Text | 1482 | — |
| LMArena Creative Writing | 1449 | — |
| Short-Story Creative Writing | — | 84.4% |
| EQ-Bench Creative Writing | 1840 | — |
| LMArena Multi-Turn | 1494 | — |
Frequently asked questions
Is Muse Spark 1.2 better than o3-pro?
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 42.9 on the Noometry Index.
Which is cheaper, Muse Spark 1.2 or o3-pro?
Muse Spark 1.2 is cheaper. It lists at $1.25 per million input tokens and $4.25 per million output tokens; o3-pro lists at $20 and $80.
Is Muse Spark 1.2 or o3-pro better for coding?
o3-pro scores higher on coding benchmarks: 55.5 versus 49.2 in the Noometry coding category.
Which has the bigger context window?
Muse Spark 1.2 does, with 1.05M tokens against 200K.
How many benchmarks do Muse Spark 1.2 and o3-pro share?
4 benchmarks have published results for both models. Muse Spark 1.2 has 31 scored results on Noometry and o3-pro has 12.