Model comparison
Kimi K2 (Jul 2025) vs Solar Pro4
Kimi K2 (Jul 2025) and Solar Pro4 score almost the same on the Noometry Index (41.2 vs 42.1), so choose on price, context window or the category you care about most.
Last verified . 17 shared benchmarks.
UpstageSummary
- They share 17 benchmarks with published results for both. Kimi K2 (Jul 2025) scores higher in 4 categories and Solar Pro4 in 4 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Kimi K2 (Jul 2025) leads 62.3 to 56.5.
- Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $0.57 / $2.30 for Kimi K2 (Jul 2025).
- Solar Pro4 accepts more context: 524K tokens versus 262K.
- Kimi K2 (Jul 2025) has downloadable open weights; the other is API-only.
Side by side
| Kimi K2 (Jul 2025) | Solar Pro4 | |
|---|---|---|
| Provider | Moonshot AI | Upstage |
| Noometry Index | 41.2 | 42.1 |
| Released | 2025-07-12 | 2026-08-06 |
| Weights | Open | Proprietary |
| Context window | 262K | 524K |
| Max output | 262K | 131K |
| Input $ / M tokens | $0.57 | $0.30 |
| Output $ / M tokens | $2.30 | $1.20 |
| Results tracked | 42 | 18 |
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Category by category
Coding Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 42.4 (#102), Solar Pro4: 40.1 (#149)
| Benchmark | Kimi K2 (Jul 2025) | Solar Pro4 |
|---|---|---|
| LMArena Coding | 1399 | 1437 |
| SWE-bench Verified (bash only) | 63.4% | — |
| Aider Polyglot | 59.1% | — |
| LMArena WebDev | — | 1371 |
| GSO | 4.9% | — |
| WeirdML | 42.8% | — |
| ALE-Bench | 597.5 | — |
Agentic & Tool Use Not comparable
Kimi K2 (Jul 2025): 32.4 (#64), Solar Pro4: —
| Benchmark | Kimi K2 (Jul 2025) | Solar Pro4 |
|---|---|---|
| Terminal-Bench | 35.7% | — |
| Berkeley Function Calling Leaderboard | 59.1% | — |
| METR Time Horizons | 59.2% | — |
Reasoning Solar Pro4 leads
Kimi K2 (Jul 2025): 23.3 (#179), Solar Pro4: 28.5 (#104)
| Benchmark | Kimi K2 (Jul 2025) | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1384 | 1399 |
| SimpleBench | 26.3% | — |
| Kagi LLM Benchmark | 64.4% | — |
| Epoch Capabilities Index | 146.01 | — |
| ForecastBench | 60.2 | — |
Math Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 42.7 (#83), Solar Pro4: 38.8 (#128)
| Benchmark | Kimi K2 (Jul 2025) | Solar Pro4 |
|---|---|---|
| LMArena Math | 1397 | 1416 |
| Omni-MATH | 65.4% | — |
| FrontierMath (Feb 2025 set) | 21.4% | — |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge Solar Pro4 leads
Kimi K2 (Jul 2025): 37.3 (#157), Solar Pro4: 39.8 (#129)
| Benchmark | Kimi K2 (Jul 2025) | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1365 | 1427 |
| MMLU-Pro | 81.9% | — |
| Confabulations | 20.4% | — |
| Vectara Hallucination Rate | 17.9% | — |
| GPQA (HELM) | 65.3% | — |
Multilingual Too close to call
Kimi K2 (Jul 2025): 49.6 (#130), Solar Pro4: 48.7 (#139)
| Benchmark | Kimi K2 (Jul 2025) | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1372 | 1361 |
| LMArena Chinese | 1415 | 1415 |
| LMArena French | 1379 | 1397 |
| LMArena German | 1387 | 1364 |
| LMArena Japanese | 1349 | 1309 |
| LMArena Korean | 1325 | 1382 |
| LMArena Russian | 1385 | 1360 |
| LMArena Spanish | 1386 | 1401 |
Instruction Following Solar Pro4 leads
Kimi K2 (Jul 2025): 71.1 (#156), Solar Pro4: 72.7 (#132)
| Benchmark | Kimi K2 (Jul 2025) | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1348 | 1377 |
| IFEval | 85% | — |
Long Context Too close to call
Kimi K2 (Jul 2025): 41.2 (#145), Solar Pro4: 42.1 (#130)
| Benchmark | Kimi K2 (Jul 2025) | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1353 | 1381 |
| Fiction.LiveBench | 66.7% | — |
| CL-bench | 17.6% | — |
Writing & Preference Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 62.3 (#78), Solar Pro4: 56.5 (#138)
| Benchmark | Kimi K2 (Jul 2025) | Solar Pro4 |
|---|---|---|
| LMArena Text | 1380 | 1386 |
| LMArena Creative Writing | 1350 | 1316 |
| LMArena Multi-Turn | 1371 | 1385 |
| Short-Story Creative Writing | 85.6% | — |
| EQ-Bench Creative Writing | 1666 | — |
| WildBench | 86.2% | — |
Frequently asked questions
Is Kimi K2 (Jul 2025) better than Solar Pro4?
Kimi K2 (Jul 2025) and Solar Pro4 score almost the same on the Noometry Index (41.2 vs 42.1), so choose on price, context window or the category you care about most.
Which is cheaper, Kimi K2 (Jul 2025) or Solar Pro4?
Solar Pro4 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; Kimi K2 (Jul 2025) lists at $0.57 and $2.30.
Is Kimi K2 (Jul 2025) or Solar Pro4 better for coding?
Kimi K2 (Jul 2025) scores higher on coding benchmarks: 42.4 versus 40.1 in the Noometry coding category.
Which has the bigger context window?
Solar Pro4 does, with 524K tokens against 262K.
How many benchmarks do Kimi K2 (Jul 2025) and Solar Pro4 share?
17 benchmarks have published results for both models. Kimi K2 (Jul 2025) has 42 scored results on Noometry and Solar Pro4 has 18.