Model comparison
Kimi K2.5 Instant vs Muse Spark
Muse Spark is the stronger model overall, scoring 50.6 to 43.6 on the Noometry Index.
Last verified . 17 shared benchmarks.
MetaSummary
- They share 17 benchmarks with published results for both. Kimi K2.5 Instant scores higher in 0 categories and Muse Spark in 9 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Muse Spark leads 65.7 to 40.2.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| Kimi K2.5 Instant | Muse Spark | |
|---|---|---|
| Provider | Moonshot AI | Meta |
| Noometry Index | 43.6 | 50.6 |
| Released | — | 2026-04-08 |
| Weights | Open | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 18 | 27 |
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Category by category
Coding Muse Spark leads
Kimi K2.5 Instant: 42.6 (#97), Muse Spark: 46.2 (#69)
| Benchmark | Kimi K2.5 Instant | Muse Spark |
|---|---|---|
| LMArena Coding | 1484 | 1481 |
| LMArena WebDev | 1404 | — |
| SciCode | — | 51.5% |
Reasoning Muse Spark leads
Kimi K2.5 Instant: 29.7 (#90), Muse Spark: 35.9 (#67)
| Benchmark | Kimi K2.5 Instant | Muse Spark |
|---|---|---|
| LMArena Hard Prompts | 1443 | 1474 |
| CritPt | — | 11.3% |
| Epoch Capabilities Index | — | 152.04 |
Math Muse Spark leads
Kimi K2.5 Instant: 39.4 (#105), Muse Spark: 47.8 (#66)
| Benchmark | Kimi K2.5 Instant | Muse Spark |
|---|---|---|
| LMArena Math | 1442 | 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
Kimi K2.5 Instant: 40.2 (#123), Muse Spark: 65.7 (#13)
| Benchmark | Kimi K2.5 Instant | Muse Spark |
|---|---|---|
| LMArena Expert | 1440 | 1457 |
| GPQA Diamond | — | 89.8% |
| Humanity's Last Exam | — | 40.6% |
Multimodal Muse Spark leads
Kimi K2.5 Instant: 40.2 (#50), Muse Spark: 43.4 (#24)
| Benchmark | Kimi K2.5 Instant | Muse Spark |
|---|---|---|
| LMArena Vision | 1254 | 1306 |
| LMArena Document | — | 1444 |
Multilingual Muse Spark leads
Kimi K2.5 Instant: 52.0 (#94), Muse Spark: 56.1 (#24)
| Benchmark | Kimi K2.5 Instant | Muse Spark |
|---|---|---|
| LMArena Non-English | 1406 | 1464 |
| LMArena Chinese | 1449 | 1509 |
| LMArena French | 1403 | 1497 |
| LMArena German | 1413 | 1497 |
| LMArena Korean | 1378 | 1459 |
| LMArena Russian | 1404 | 1466 |
| LMArena Spanish | 1447 | 1472 |
Instruction Following Too close to call
Kimi K2.5 Instant: 75.3 (#65), Muse Spark: 75.9 (#51)
| Benchmark | Kimi K2.5 Instant | Muse Spark |
|---|---|---|
| LMArena Instruction Following | 1430 | 1442 |
Long Context Too close to call
Kimi K2.5 Instant: 43.9 (#83), Muse Spark: 44.4 (#69)
| Benchmark | Kimi K2.5 Instant | Muse Spark |
|---|---|---|
| LMArena Longer Query | 1435 | 1451 |
Writing & Preference Muse Spark leads
Kimi K2.5 Instant: 60.6 (#95), Muse Spark: 66.0 (#39)
| Benchmark | Kimi K2.5 Instant | Muse Spark |
|---|---|---|
| LMArena Text | 1420 | 1474 |
| LMArena Creative Writing | 1381 | 1459 |
| LMArena Multi-Turn | 1427 | 1477 |
Frequently asked questions
Is Kimi K2.5 Instant better than Muse Spark?
Muse Spark is the stronger model overall, scoring 50.6 to 43.6 on the Noometry Index.
Is Kimi K2.5 Instant or Muse Spark better for coding?
Muse Spark scores higher on coding benchmarks: 46.2 versus 42.6 in the Noometry coding category.
How many benchmarks do Kimi K2.5 Instant and Muse Spark share?
17 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and Muse Spark has 27.