Model comparison
Kimi K2.5 Instant vs Solar Pro4
Kimi K2.5 Instant is the stronger model overall, scoring 42.9 to 41.5 on the Noometry Index.
Last verified . 17 shared benchmarks.
UpstageSummary
- They share 17 benchmarks with published results for both. Kimi K2.5 Instant scores higher in 8 categories and Solar Pro4 in 0 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Kimi K2.5 Instant leads 60.8 to 56.7.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| Kimi K2.5 Instant | Solar Pro4 | |
|---|---|---|
| Provider | Moonshot AI | Upstage |
| Noometry Index | 42.9 | 41.5 |
| Released | — | 2026-08-06 |
| Weights | Open | Proprietary |
| Context window | — | 524K |
| Max output | — | 131K |
| Input $ / M tokens | — | $0.30 |
| Output $ / M tokens | — | $1.20 |
| Results tracked | 18 | 18 |
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Category by category
Coding Kimi K2.5 Instant leads
Kimi K2.5 Instant: 42.3 (#95), Solar Pro4: 39.9 (#135)
| Benchmark | Kimi K2.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena WebDev | 1404 | 1371 |
| LMArena Coding | 1483 | 1439 |
Reasoning Kimi K2.5 Instant leads
Kimi K2.5 Instant: 28.5 (#88), Solar Pro4: 27.3 (#107)
| Benchmark | Kimi K2.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1443 | 1398 |
Math Too close to call
Kimi K2.5 Instant: 36.6 (#105), Solar Pro4: 36.1 (#129)
| Benchmark | Kimi K2.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Math | 1443 | 1418 |
Knowledge Too close to call
Kimi K2.5 Instant: 39.5 (#121), Solar Pro4: 39.0 (#128)
| Benchmark | Kimi K2.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1438 | 1421 |
Multimodal Not comparable
Kimi K2.5 Instant: 39.5 (#47), Solar Pro4: —
| Benchmark | Kimi K2.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Vision | 1254 | — |
Multilingual Kimi K2.5 Instant leads
Kimi K2.5 Instant: 52.2 (#89), Solar Pro4: 49.0 (#134)
| Benchmark | Kimi K2.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1406 | 1362 |
| LMArena Chinese | 1450 | 1417 |
| LMArena French | 1403 | 1403 |
| LMArena German | 1413 | 1351 |
| LMArena Korean | 1378 | 1383 |
| LMArena Russian | 1404 | 1360 |
| LMArena Spanish | 1448 | 1408 |
| LMArena Japanese | — | 1300 |
Instruction Following Kimi K2.5 Instant leads
Kimi K2.5 Instant: 75.5 (#61), Solar Pro4: 72.8 (#128)
| Benchmark | Kimi K2.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1430 | 1376 |
Long Context Kimi K2.5 Instant leads
Kimi K2.5 Instant: 43.8 (#82), Solar Pro4: 42.0 (#125)
| Benchmark | Kimi K2.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1435 | 1379 |
Writing & Preference Kimi K2.5 Instant leads
Kimi K2.5 Instant: 60.8 (#91), Solar Pro4: 56.7 (#133)
| Benchmark | Kimi K2.5 Instant | Solar Pro4 |
|---|---|---|
| LMArena Text | 1420 | 1386 |
| LMArena Creative Writing | 1379 | 1313 |
| LMArena Multi-Turn | 1427 | 1391 |
Frequently asked questions
Is Kimi K2.5 Instant better than Solar Pro4?
Kimi K2.5 Instant is the stronger model overall, scoring 42.9 to 41.5 on the Noometry Index.
Is Kimi K2.5 Instant or Solar Pro4 better for coding?
Kimi K2.5 Instant scores higher on coding benchmarks: 42.3 versus 39.9 in the Noometry coding category.
How many benchmarks do Kimi K2.5 Instant and Solar Pro4 share?
17 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and Solar Pro4 has 18.