Model comparison
Amazon Nova Experimental Chat 10 20 vs Kimi K2 (Jul 2025)
Amazon Nova Experimental Chat 10 20 and Kimi K2 (Jul 2025) score almost the same on the Noometry Index (42.1 vs 41.2), so choose on price, context window or the category you care about most.
Last verified . 17 shared benchmarks.
Summary
- They share 17 benchmarks with published results for both. Amazon Nova Experimental Chat 10 20 scores higher in 4 categories and Kimi K2 (Jul 2025) in 4 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Kimi K2 (Jul 2025) leads 62.3 to 56.6.
- Kimi K2 (Jul 2025) has downloadable open weights; the other is API-only.
Side by side
| Amazon Nova Experimental Chat 10 20 | Kimi K2 (Jul 2025) | |
|---|---|---|
| Provider | Amazon | Moonshot AI |
| Noometry Index | 42.1 | 41.2 |
| Released | — | 2025-07-12 |
| Weights | Proprietary | Open |
| Context window | — | 262K |
| Max output | — | 262K |
| Input $ / M tokens | — | $0.57 |
| Output $ / M tokens | — | $2.30 |
| Results tracked | 17 | 42 |
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Category by category
Coding Too close to call
Amazon Nova Experimental Chat 10 20: 41.6 (#123), Kimi K2 (Jul 2025): 42.4 (#102)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Coding | 1412 | 1399 |
| SWE-bench Verified (bash only) | — | 63.4% |
| Aider Polyglot | — | 59.1% |
| GSO | — | 4.9% |
| WeirdML | — | 42.8% |
| ALE-Bench | — | 597.5 |
Agentic & Tool Use Not comparable
Amazon Nova Experimental Chat 10 20: —, Kimi K2 (Jul 2025): 32.4 (#64)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Kimi K2 (Jul 2025) |
|---|---|---|
| Terminal-Bench | — | 35.7% |
| Berkeley Function Calling Leaderboard | — | 59.1% |
| METR Time Horizons | — | 59.2% |
Reasoning Amazon Nova Experimental Chat 10 20 leads
Amazon Nova Experimental Chat 10 20: 28.4 (#106), Kimi K2 (Jul 2025): 23.3 (#179)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Hard Prompts | 1396 | 1384 |
| SimpleBench | — | 26.3% |
| Kagi LLM Benchmark | — | 64.4% |
| Epoch Capabilities Index | — | 146.01 |
| ForecastBench | — | 60.2 |
Math Kimi K2 (Jul 2025) leads
Amazon Nova Experimental Chat 10 20: 39.0 (#119), Kimi K2 (Jul 2025): 42.7 (#83)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Math | 1425 | 1397 |
| Omni-MATH | — | 65.4% |
| FrontierMath (Feb 2025 set) | — | 21.4% |
| FrontierMath Tier 4 (v1) | — | 0% |
Knowledge Amazon Nova Experimental Chat 10 20 leads
Amazon Nova Experimental Chat 10 20: 38.5 (#144), Kimi K2 (Jul 2025): 37.3 (#157)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Expert | 1386 | 1365 |
| MMLU-Pro | — | 81.9% |
| Confabulations | — | 20.4% |
| Vectara Hallucination Rate | — | 17.9% |
| GPQA (HELM) | — | 65.3% |
Multilingual Too close to call
Amazon Nova Experimental Chat 10 20: 49.5 (#131), Kimi K2 (Jul 2025): 49.6 (#130)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Non-English | 1372 | 1372 |
| LMArena Chinese | 1404 | 1415 |
| LMArena French | 1425 | 1379 |
| LMArena German | 1391 | 1387 |
| LMArena Japanese | 1360 | 1349 |
| LMArena Korean | 1324 | 1325 |
| LMArena Russian | 1371 | 1385 |
| LMArena Spanish | 1382 | 1386 |
Instruction Following Too close to call
Amazon Nova Experimental Chat 10 20: 72.1 (#141), Kimi K2 (Jul 2025): 71.1 (#156)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Instruction Following | 1365 | 1348 |
| IFEval | — | 85% |
Long Context Too close to call
Amazon Nova Experimental Chat 10 20: 41.7 (#133), Kimi K2 (Jul 2025): 41.2 (#145)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Longer Query | 1370 | 1353 |
| Fiction.LiveBench | — | 66.7% |
| CL-bench | — | 17.6% |
Writing & Preference Kimi K2 (Jul 2025) leads
Amazon Nova Experimental Chat 10 20: 56.6 (#136), Kimi K2 (Jul 2025): 62.3 (#78)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Text | 1394 | 1380 |
| LMArena Creative Writing | 1318 | 1350 |
| LMArena Multi-Turn | 1364 | 1371 |
| Short-Story Creative Writing | — | 85.6% |
| EQ-Bench Creative Writing | — | 1666 |
| WildBench | — | 86.2% |
Frequently asked questions
Is Amazon Nova Experimental Chat 10 20 better than Kimi K2 (Jul 2025)?
Amazon Nova Experimental Chat 10 20 and Kimi K2 (Jul 2025) score almost the same on the Noometry Index (42.1 vs 41.2), so choose on price, context window or the category you care about most.
Is Amazon Nova Experimental Chat 10 20 or Kimi K2 (Jul 2025) better for coding?
They score almost the same on coding (41.6 vs 42.4); test both on your own repository before choosing.
How many benchmarks do Amazon Nova Experimental Chat 10 20 and Kimi K2 (Jul 2025) share?
17 benchmarks have published results for both models. Amazon Nova Experimental Chat 10 20 has 17 scored results on Noometry and Kimi K2 (Jul 2025) has 42.