Model comparison
Kimi K2.5 Instant vs Muse Spark 1.2
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 43.6 on the Noometry Index.
Last verified . 16 shared benchmarks.
MetaSummary
- They share 16 benchmarks with published results for both. Kimi K2.5 Instant scores higher in 0 categories and Muse Spark 1.2 in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Muse Spark 1.2 leads 51.3 to 29.7.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| Kimi K2.5 Instant | Muse Spark 1.2 | |
|---|---|---|
| Provider | Moonshot AI | Meta |
| Noometry Index | 43.6 | 50.3 |
| Released | — | 2026-08-05 |
| Weights | Open | Proprietary |
| Context window | — | 1.05M |
| Max output | — | 131K |
| Input $ / M tokens | — | $1.25 |
| Output $ / M tokens | — | $4.25 |
| Results tracked | 18 | 31 |
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Category by category
Coding Muse Spark 1.2 leads
Kimi K2.5 Instant: 42.6 (#97), Muse Spark 1.2: 49.2 (#51)
| Benchmark | Kimi K2.5 Instant | Muse Spark 1.2 |
|---|---|---|
| LMArena WebDev | 1404 | 1533 |
| LMArena Coding | 1484 | 1495 |
| DeepSWE | — | 54.9% |
| FrontierSWE | — | 12% |
| SciCode | — | 56.4% |
| WeirdML | — | 60.3% |
Agentic & Tool Use Not comparable
Kimi K2.5 Instant: —, Muse Spark 1.2: 29.4 (#87)
| Benchmark | Kimi K2.5 Instant | Muse Spark 1.2 |
|---|---|---|
| APEX-Agents | — | 36.4% |
| GDP.pdf | — | 16% |
Reasoning Muse Spark 1.2 leads
Kimi K2.5 Instant: 29.7 (#90), Muse Spark 1.2: 51.3 (#34)
| Benchmark | Kimi K2.5 Instant | Muse Spark 1.2 |
|---|---|---|
| LMArena Hard Prompts | 1443 | 1486 |
| SimpleBench | — | 74.5% |
| NYT Connections (extended) | — | 79.2% |
| CritPt | — | 17.7% |
| DTBench | — | 94.7% |
| LMCA | — | 48.4% |
| Epoch Capabilities Index | — | 154.87 |
Math Muse Spark 1.2 leads
Kimi K2.5 Instant: 39.4 (#105), Muse Spark 1.2: 46.4 (#70)
| Benchmark | Kimi K2.5 Instant | Muse Spark 1.2 |
|---|---|---|
| LMArena Math | 1442 | 1471 |
| ProofBench | — | 43% |
Knowledge Muse Spark 1.2 leads
Kimi K2.5 Instant: 40.2 (#123), Muse Spark 1.2: 54.1 (#53)
| Benchmark | Kimi K2.5 Instant | Muse Spark 1.2 |
|---|---|---|
| LMArena Expert | 1440 | 1480 |
| SimpleQA Verified | — | 60.3% |
Multimodal Muse Spark 1.2 leads
Kimi K2.5 Instant: 40.2 (#50), Muse Spark 1.2: 43.4 (#25)
| Benchmark | Kimi K2.5 Instant | Muse Spark 1.2 |
|---|---|---|
| LMArena Vision | 1254 | 1305 |
Multilingual Muse Spark 1.2 leads
Kimi K2.5 Instant: 52.0 (#94), Muse Spark 1.2: 57.1 (#11)
| Benchmark | Kimi K2.5 Instant | Muse Spark 1.2 |
|---|---|---|
| LMArena Non-English | 1406 | 1478 |
| LMArena Chinese | 1449 | 1511 |
| LMArena French | 1403 | 1513 |
| LMArena Russian | 1404 | 1487 |
| LMArena Spanish | 1447 | 1498 |
| LMArena German | 1413 | — |
| LMArena Korean | 1378 | — |
Instruction Following Muse Spark 1.2 leads
Kimi K2.5 Instant: 75.3 (#65), Muse Spark 1.2: 76.7 (#36)
| Benchmark | Kimi K2.5 Instant | Muse Spark 1.2 |
|---|---|---|
| LMArena Instruction Following | 1430 | 1461 |
Long Context Muse Spark 1.2 leads
Kimi K2.5 Instant: 43.9 (#83), Muse Spark 1.2: 45.2 (#48)
| Benchmark | Kimi K2.5 Instant | Muse Spark 1.2 |
|---|---|---|
| LMArena Longer Query | 1435 | 1475 |
Writing & Preference Muse Spark 1.2 leads
Kimi K2.5 Instant: 60.6 (#95), Muse Spark 1.2: 72.3 (#14)
| Benchmark | Kimi K2.5 Instant | Muse Spark 1.2 |
|---|---|---|
| LMArena Text | 1420 | 1482 |
| LMArena Creative Writing | 1381 | 1449 |
| LMArena Multi-Turn | 1427 | 1494 |
| EQ-Bench Creative Writing | — | 1840 |
Frequently asked questions
Is Kimi K2.5 Instant better than Muse Spark 1.2?
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 43.6 on the Noometry Index.
Is Kimi K2.5 Instant or Muse Spark 1.2 better for coding?
Muse Spark 1.2 scores higher on coding benchmarks: 49.2 versus 42.6 in the Noometry coding category.
How many benchmarks do Kimi K2.5 Instant and Muse Spark 1.2 share?
16 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and Muse Spark 1.2 has 31.