Model comparison
C4ai Aya Expanse 8b vs Muse Spark
Muse Spark is the stronger model overall, scoring 50.6 to 34.9 on the Noometry Index.
Last verified . 13 shared benchmarks.
Cohere
MetaSummary
- They share 13 benchmarks with published results for both. C4ai Aya Expanse 8b scores higher in 0 categories and Muse Spark in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Muse Spark leads 65.7 to 33.6.
- C4ai Aya Expanse 8b has downloadable open weights; the other is API-only.
Side by side
| C4ai Aya Expanse 8b | Muse Spark | |
|---|---|---|
| Provider | Cohere | Meta |
| Noometry Index | 34.9 | 50.6 |
| Released | — | 2026-04-08 |
| Weights | Open | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 15 | 27 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Muse Spark leads
C4ai Aya Expanse 8b: 33.8 (#252), Muse Spark: 46.2 (#69)
| Benchmark | C4ai Aya Expanse 8b | Muse Spark |
|---|---|---|
| LMArena Coding | 1160 | 1481 |
| SciCode | — | 51.5% |
Reasoning Muse Spark leads
C4ai Aya Expanse 8b: 22.4 (#197), Muse Spark: 35.9 (#67)
| Benchmark | C4ai Aya Expanse 8b | Muse Spark |
|---|---|---|
| LMArena Hard Prompts | 1156 | 1474 |
| CritPt | — | 11.3% |
| Epoch Capabilities Index | — | 152.04 |
Math Muse Spark leads
C4ai Aya Expanse 8b: 33.3 (#203), Muse Spark: 47.8 (#66)
| Benchmark | C4ai Aya Expanse 8b | Muse Spark |
|---|---|---|
| LMArena Math | 1168 | 1455 |
| OTIS Mock AIME 2024-2025 | — | 88.9% |
| ProofBench | — | 17% |
| FrontierMath (Feb 2025 set) | — | 39% |
| FrontierMath Tier 4 (v1) | — | 14.6% |
Knowledge Muse Spark leads
C4ai Aya Expanse 8b: 33.6 (#201), Muse Spark: 65.7 (#13)
| Benchmark | C4ai Aya Expanse 8b | Muse Spark |
|---|---|---|
| LMArena Expert | 1153 | 1457 |
| GPQA Diamond | — | 89.8% |
| Humanity's Last Exam | — | 40.6% |
| Vectara Hallucination Rate | 9.5% | — |
Multimodal Not comparable
C4ai Aya Expanse 8b: —, Muse Spark: 43.4 (#24)
| Benchmark | C4ai Aya Expanse 8b | Muse Spark |
|---|---|---|
| LMArena Vision | — | 1306 |
| LMArena Document | — | 1444 |
Multilingual Muse Spark leads
C4ai Aya Expanse 8b: 36.1 (#242), Muse Spark: 56.1 (#24)
| Benchmark | C4ai Aya Expanse 8b | Muse Spark |
|---|---|---|
| LMArena Non-English | 1180 | 1464 |
| LMArena Chinese | 1181 | 1509 |
| LMArena German | 1188 | 1497 |
| LMArena Russian | 1197 | 1466 |
| LMArena French | — | 1497 |
| LMArena Japanese | 1120 | — |
| LMArena Korean | — | 1459 |
| LMArena Spanish | — | 1472 |
Instruction Following Muse Spark leads
C4ai Aya Expanse 8b: 60.1 (#253), Muse Spark: 75.9 (#51)
| Benchmark | C4ai Aya Expanse 8b | Muse Spark |
|---|---|---|
| LMArena Instruction Following | 1155 | 1442 |
Long Context Muse Spark leads
C4ai Aya Expanse 8b: 36.1 (#236), Muse Spark: 44.4 (#69)
| Benchmark | C4ai Aya Expanse 8b | Muse Spark |
|---|---|---|
| LMArena Longer Query | 1191 | 1451 |
Writing & Preference Muse Spark leads
C4ai Aya Expanse 8b: 39.0 (#250), Muse Spark: 66.0 (#39)
| Benchmark | C4ai Aya Expanse 8b | Muse Spark |
|---|---|---|
| LMArena Text | 1185 | 1474 |
| LMArena Creative Writing | 1168 | 1459 |
| LMArena Multi-Turn | 1160 | 1477 |
Frequently asked questions
Is C4ai Aya Expanse 8b better than Muse Spark?
Muse Spark is the stronger model overall, scoring 50.6 to 34.9 on the Noometry Index.
Is C4ai Aya Expanse 8b or Muse Spark better for coding?
Muse Spark scores higher on coding benchmarks: 46.2 versus 33.8 in the Noometry coding category.
How many benchmarks do C4ai Aya Expanse 8b and Muse Spark share?
13 benchmarks have published results for both models. C4ai Aya Expanse 8b has 15 scored results on Noometry and Muse Spark has 27.