Model comparison
Molmo 2 8b vs Muse Spark
Muse Spark is the stronger model overall, scoring 50.6 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 in 5 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Muse Spark leads 66.0 to 49.4.
- Molmo 2 8b has downloadable open weights; the other is API-only.
Side by side
| Molmo 2 8b | Muse Spark | |
|---|---|---|
| Provider | Allen Institute for AI (Ai2) | Meta |
| Noometry Index | 39.1 | 50.6 |
| Released | — | 2026-04-08 |
| Weights | Open | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 5 | 27 |
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Category by category
Coding Not comparable
Molmo 2 8b: —, Muse Spark: 46.2 (#69)
| Benchmark | Molmo 2 8b | Muse Spark |
|---|---|---|
| SciCode | — | 51.5% |
| LMArena Coding | — | 1481 |
Reasoning Muse Spark leads
Molmo 2 8b: 25.6 (#146), Muse Spark: 35.9 (#67)
| Benchmark | Molmo 2 8b | Muse Spark |
|---|---|---|
| LMArena Hard Prompts | 1287 | 1474 |
| CritPt | — | 11.3% |
| Epoch Capabilities Index | — | 152.04 |
Math Not comparable
Molmo 2 8b: —, Muse Spark: 47.8 (#66)
| Benchmark | Molmo 2 8b | Muse Spark |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 88.9% |
| ProofBench | — | 17% |
| LMArena Math | — | 1455 |
| FrontierMath (Feb 2025 set) | — | 39% |
| FrontierMath Tier 4 (v1) | — | 14.6% |
Knowledge Not comparable
Molmo 2 8b: —, Muse Spark: 65.7 (#13)
| Benchmark | Molmo 2 8b | Muse Spark |
|---|---|---|
| GPQA Diamond | — | 89.8% |
| Humanity's Last Exam | — | 40.6% |
| LMArena Expert | — | 1457 |
Multimodal Muse Spark leads
Molmo 2 8b: 30.2 (#112), Muse Spark: 43.4 (#24)
| Benchmark | Molmo 2 8b | Muse Spark |
|---|---|---|
| LMArena Vision | 1081 | 1306 |
| LMArena Document | — | 1444 |
Multilingual Muse Spark leads
Molmo 2 8b: 42.7 (#190), Muse Spark: 56.1 (#24)
| Benchmark | Molmo 2 8b | Muse Spark |
|---|---|---|
| LMArena Non-English | 1276 | 1464 |
| LMArena Chinese | — | 1509 |
| LMArena French | — | 1497 |
| LMArena German | — | 1497 |
| LMArena Korean | — | 1459 |
| LMArena Russian | — | 1466 |
| LMArena Spanish | — | 1472 |
Instruction Following Muse Spark leads
Molmo 2 8b: 67.0 (#201), Muse Spark: 75.9 (#51)
| Benchmark | Molmo 2 8b | Muse Spark |
|---|---|---|
| LMArena Instruction Following | 1270 | 1442 |
Long Context Not comparable
Molmo 2 8b: —, Muse Spark: 44.4 (#69)
| Benchmark | Molmo 2 8b | Muse Spark |
|---|---|---|
| LMArena Longer Query | — | 1451 |
Writing & Preference Muse Spark leads
Molmo 2 8b: 49.4 (#191), Muse Spark: 66.0 (#39)
| Benchmark | Molmo 2 8b | Muse Spark |
|---|---|---|
| LMArena Text | 1288 | 1474 |
| LMArena Creative Writing | — | 1459 |
| LMArena Multi-Turn | — | 1477 |
Frequently asked questions
Is Molmo 2 8b better than Muse Spark?
Muse Spark is the stronger model overall, scoring 50.6 to 39.1 on the Noometry Index.
How many benchmarks do Molmo 2 8b and Muse Spark share?
5 benchmarks have published results for both models. Molmo 2 8b has 5 scored results on Noometry and Muse Spark has 27.