Model comparison
Molmo 2 8b vs Muse Spark 1.3
Muse Spark 1.3 is the stronger model overall, scoring 54.8 to 39.1 on the Noometry Index.
Last verified . 5 shared benchmarks.
Allen Institute for AI (Ai2)
MetaSummary
- They share 5 benchmarks with published results for both. Molmo 2 8b scores higher in 0 categories and Muse Spark 1.3 in 5 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Muse Spark 1.3 leads 54.0 to 25.6.
- Molmo 2 8b has downloadable open weights; the other is API-only.
Side by side
| Molmo 2 8b | Muse Spark 1.3 | |
|---|---|---|
| Provider | Allen Institute for AI (Ai2) | Meta |
| Noometry Index | 39.1 | 54.8 |
| Released | — | 2026-09-02 |
| Weights | Open | Proprietary |
| Context window | — | 1.05M |
| Max output | — | 131K |
| Input $ / M tokens | — | $1.25 |
| Output $ / M tokens | — | $4.25 |
| Results tracked | 5 | 37 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Not comparable
Molmo 2 8b: —, Muse Spark 1.3: 56.6 (#21)
| Benchmark | Molmo 2 8b | Muse Spark 1.3 |
|---|---|---|
| CursorBench | — | 41.6% |
| LMArena WebDev | — | 1657 |
| SciCode | — | 59.7% |
| LMArena Coding | — | 1514 |
Agentic & Tool Use Not comparable
Molmo 2 8b: —, Muse Spark 1.3: 38.6 (#30)
| Benchmark | Molmo 2 8b | Muse Spark 1.3 |
|---|---|---|
| APEX-Agents | — | 57.8% |
| GDP.pdf | — | 27.6% |
Reasoning Muse Spark 1.3 leads
Molmo 2 8b: 25.6 (#146), Muse Spark 1.3: 54.0 (#27)
| Benchmark | Molmo 2 8b | Muse Spark 1.3 |
|---|---|---|
| LMArena Hard Prompts | 1287 | 1503 |
| NYT Connections (extended) | — | 85.1% |
| CritPt | — | 26% |
| Chess Puzzles | — | 38% |
| Mystery Game Puzzles | — | 25% |
| DTBench | — | 96.5% |
| LMCA | — | 53.9% |
| Bench to the Future 3 | — | 0.14 |
| Epoch Capabilities Index | — | 156.75 |
Math Not comparable
Molmo 2 8b: —, Muse Spark 1.3: 73.1 (#21)
| Benchmark | Molmo 2 8b | Muse Spark 1.3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 74.4% |
| FrontierMath Tier 4 | — | 46.3% |
| OTIS Mock AIME 2024-2025 | — | 99.2% |
| ProofBench | — | 58% |
| LMArena Math | — | 1494 |
Knowledge Not comparable
Molmo 2 8b: —, Muse Spark 1.3: 42.6 (#95)
| Benchmark | Molmo 2 8b | Muse Spark 1.3 |
|---|---|---|
| LMArena Expert | — | 1516 |
Multimodal Muse Spark 1.3 leads
Molmo 2 8b: 30.2 (#112), Muse Spark 1.3: 43.7 (#22)
| Benchmark | Molmo 2 8b | Muse Spark 1.3 |
|---|---|---|
| LMArena Vision | 1081 | 1309 |
| LMArena Document | — | 1471 |
Multilingual Muse Spark 1.3 leads
Molmo 2 8b: 42.7 (#190), Muse Spark 1.3: 57.4 (#8)
| Benchmark | Molmo 2 8b | Muse Spark 1.3 |
|---|---|---|
| LMArena Non-English | 1276 | 1481 |
| LMArena Chinese | — | 1529 |
| LMArena French | — | 1524 |
| LMArena German | — | 1515 |
| LMArena Japanese | — | 1474 |
| LMArena Korean | — | 1501 |
| LMArena Russian | — | 1490 |
| LMArena Spanish | — | 1490 |
Instruction Following Muse Spark 1.3 leads
Molmo 2 8b: 67.0 (#201), Muse Spark 1.3: 77.5 (#22)
| Benchmark | Molmo 2 8b | Muse Spark 1.3 |
|---|---|---|
| LMArena Instruction Following | 1270 | 1477 |
Long Context Not comparable
Molmo 2 8b: —, Muse Spark 1.3: 45.6 (#32)
| Benchmark | Molmo 2 8b | Muse Spark 1.3 |
|---|---|---|
| LMArena Longer Query | — | 1488 |
Writing & Preference Muse Spark 1.3 leads
Molmo 2 8b: 49.4 (#191), Muse Spark 1.3: 73.6 (#9)
| Benchmark | Molmo 2 8b | Muse Spark 1.3 |
|---|---|---|
| LMArena Text | 1288 | 1490 |
| LMArena Creative Writing | — | 1455 |
| EQ-Bench Creative Writing | — | 1906 |
| LMArena Multi-Turn | — | 1482 |
Frequently asked questions
Is Molmo 2 8b better than Muse Spark 1.3?
Muse Spark 1.3 is the stronger model overall, scoring 54.8 to 39.1 on the Noometry Index.
How many benchmarks do Molmo 2 8b and Muse Spark 1.3 share?
5 benchmarks have published results for both models. Molmo 2 8b has 5 scored results on Noometry and Muse Spark 1.3 has 37.