Model comparison
Amazon Nova Experimental Chat 26 02 10 vs Kimi K2.5
Kimi K2.5 is the stronger model overall, scoring 48.1 to 44.5 on the Noometry Index.
Last verified . 12 shared benchmarks.
Summary
- They share 12 benchmarks with published results for both. Amazon Nova Experimental Chat 26 02 10 scores higher in 1 category and Kimi K2.5 in 7 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in math, where Kimi K2.5 leads 51.8 to 39.3.
- Kimi K2.5 has downloadable open weights; the other is API-only.
Side by side
| Amazon Nova Experimental Chat 26 02 10 | Kimi K2.5 | |
|---|---|---|
| Provider | Amazon | Moonshot AI |
| Noometry Index | 44.5 | 48.1 |
| Released | — | 2026-01-27 |
| Weights | Proprietary | Open |
| Context window | — | 262K |
| Max output | — | 262K |
| Input $ / M tokens | — | $0.45 |
| Output $ / M tokens | — | $2.25 |
| Results tracked | 12 | 51 |
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Category by category
Coding Kimi K2.5 leads
Amazon Nova Experimental Chat 26 02 10: 43.9 (#82), Kimi K2.5: 48.8 (#53)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Kimi K2.5 |
|---|---|---|
| LMArena Coding | 1483 | 1474 |
| SWE-bench Verified | — | 73.8% |
| SWE-bench Verified (bash only) | — | 70.8% |
| LMArena WebDev | — | 1437 |
| SWE-bench Multilingual | — | 67.3% |
| SciCode | — | 49% |
| WeirdML | — | 45.6% |
| ALE-Bench | — | 821.65 |
Agentic & Tool Use Not comparable
Amazon Nova Experimental Chat 26 02 10: —, Kimi K2.5: 34.2 (#48)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Kimi K2.5 |
|---|---|---|
| Terminal-Bench | — | 43.2% |
| OSWorld | — | 63.3% |
| Vending-Bench 2 | — | 1,198 |
Reasoning Kimi K2.5 leads
Amazon Nova Experimental Chat 26 02 10: 30.1 (#86), Kimi K2.5: 31.2 (#80)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Kimi K2.5 |
|---|---|---|
| LMArena Hard Prompts | 1458 | 1453 |
| ARC-AGI-2 | — | 11.8% |
| SimpleBench | — | 46.8% |
| Kagi LLM Benchmark | — | 78.5% |
| NYT Connections (extended) | — | 69.9% |
| ARC-AGI-1 | — | 65.3% |
| CritPt | — | 3.1% |
| Chess Puzzles | — | 12% |
| EnigmaEval | — | 3.4% |
| Thematic Generalization | — | 69.4% |
| Epoch Capabilities Index | — | 148.03 |
Math Kimi K2.5 leads
Amazon Nova Experimental Chat 26 02 10: 39.3 (#109), Kimi K2.5: 51.8 (#53)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Kimi K2.5 |
|---|---|---|
| LMArena Math | 1438 | 1470 |
| MathArena Final-Answer Competitions | — | 62.3% |
| OTIS Mock AIME 2024-2025 | — | 92.2% |
| FrontierMath (Feb 2025 set) | — | 27.9% |
| FrontierMath Tier 4 (v1) | — | 4.2% |
Knowledge Kimi K2.5 leads
Amazon Nova Experimental Chat 26 02 10: 42.3 (#97), Kimi K2.5: 53.6 (#56)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Kimi K2.5 |
|---|---|---|
| LMArena Expert | 1506 | 1466 |
| GPQA Diamond | — | 87.6% |
| Humanity's Last Exam | — | 24.4% |
| SimpleQA Verified | — | 34.3% |
| Vectara Hallucination Rate | — | 14.2% |
Multimodal Not comparable
Amazon Nova Experimental Chat 26 02 10: —, Kimi K2.5: 41.1 (#39)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Kimi K2.5 |
|---|---|---|
| LMArena Vision | — | 1269 |
| LMArena Document | — | 1430 |
Multilingual Too close to call
Amazon Nova Experimental Chat 26 02 10: 54.0 (#50), Kimi K2.5: 53.9 (#53)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Kimi K2.5 |
|---|---|---|
| LMArena Non-English | 1434 | 1433 |
| LMArena Chinese | 1463 | 1495 |
| LMArena Russian | 1423 | 1435 |
| LMArena French | — | 1454 |
| LMArena German | — | 1441 |
| LMArena Japanese | — | 1421 |
| LMArena Korean | — | 1410 |
| LMArena Spanish | — | 1450 |
Instruction Following Too close to call
Amazon Nova Experimental Chat 26 02 10: 75.2 (#69), Kimi K2.5: 75.3 (#64)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Kimi K2.5 |
|---|---|---|
| LMArena Instruction Following | 1427 | 1431 |
Long Context Kimi K2.5 leads
Amazon Nova Experimental Chat 26 02 10: 44.0 (#77), Kimi K2.5: 52.1 (#7)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Kimi K2.5 |
|---|---|---|
| LMArena Longer Query | 1441 | 1445 |
| Fiction.LiveBench | — | 86.1% |
| CL-bench | — | 19.3% |
| CL-bench Life | — | 13.2% |
Writing & Preference Kimi K2.5 leads
Amazon Nova Experimental Chat 26 02 10: 61.8 (#84), Kimi K2.5: 65.1 (#53)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Kimi K2.5 |
|---|---|---|
| LMArena Text | 1448 | 1445 |
| LMArena Creative Writing | 1368 | 1423 |
| LMArena Multi-Turn | 1442 | 1444 |
| EQ-Bench Creative Writing | — | 1579 |
Frequently asked questions
Is Amazon Nova Experimental Chat 26 02 10 better than Kimi K2.5?
Kimi K2.5 is the stronger model overall, scoring 48.1 to 44.5 on the Noometry Index.
Is Amazon Nova Experimental Chat 26 02 10 or Kimi K2.5 better for coding?
Kimi K2.5 scores higher on coding benchmarks: 48.8 versus 43.9 in the Noometry coding category.
How many benchmarks do Amazon Nova Experimental Chat 26 02 10 and Kimi K2.5 share?
12 benchmarks have published results for both models. Amazon Nova Experimental Chat 26 02 10 has 12 scored results on Noometry and Kimi K2.5 has 51.