Model comparison
GPT-4.5 vs Kimi K2.6
Kimi K2.6 is the stronger model overall, scoring 47.7 to 37.2 on the Noometry Index.
Last verified . 22 shared benchmarks.
Summary
- They share 22 benchmarks with published results for both. GPT-4.5 scores higher in 2 categories and Kimi K2.6 in 8 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Kimi K2.6 leads 40.5 to 13.9.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 37.8% for GPT-4.5 and 96.1% for Kimi K2.6.
- Kimi K2.6 has downloadable open weights; the other is API-only.
Side by side
| GPT-4.5 | Kimi K2.6 | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 37.2 | 47.7 |
| Released | 2025-02-27 | 2026-04-20 |
| Weights | Proprietary | Open |
| Context window | — | 262K |
| Max output | — | 262K |
| Input $ / M tokens | — | $0.95 |
| Output $ / M tokens | — | $4 |
| Results tracked | 42 | 51 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Kimi K2.6 leads
GPT-4.5: 42.2 (#109), Kimi K2.6: 50.7 (#43)
| Benchmark | GPT-4.5 | Kimi K2.6 |
|---|---|---|
| WeirdML | 39.4% | 55.9% |
| LMArena Coding | 1396 | 1488 |
| SWE-bench Verified | — | 76.7% |
| Aider Polyglot | 44.9% | — |
| LMArena WebDev | — | 1509 |
| SciCode | — | 53.5% |
| LiveBench Coding | 75.2% | — |
| ALE-Bench | — | 1,093 |
Agentic & Tool Use GPT-4.5 leads
GPT-4.5: 27.9 (#97), Kimi K2.6: 21.9 (#137)
| Benchmark | GPT-4.5 | Kimi K2.6 |
|---|---|---|
| OSWorld 2.0 | — | 4.6% |
| Cybench | 17.5% | — |
| ExploitBench | — | 18.4% |
| GBAEval | — | 0.9% |
| GDP.pdf | — | 12% |
| Vending-Bench 2 | — | 6,205 |
Reasoning Kimi K2.6 leads
GPT-4.5: 13.9 (#330), Kimi K2.6: 40.5 (#55)
| Benchmark | GPT-4.5 | Kimi K2.6 |
|---|---|---|
| LMArena Hard Prompts | 1403 | 1470 |
| Epoch Capabilities Index | 136.74 | 151.05 |
| ARC-AGI-2 | 0.8% | — |
| SimpleBench | 34.5% | — |
| NYT Connections (extended) | — | 87.2% |
| ARC-AGI-1 | 10.3% | — |
| CritPt | — | 8% |
| Chess Puzzles | — | 26% |
| EnigmaEval | 3.2% | — |
| EBR-Bench | — | 2.4% |
| LiveBench Reasoning | 71.1% | — |
| Mystery Game Puzzles | — | 18% |
| DTBench | — | 90.9% |
| LiveBench Data Analysis | 64.3% | — |
| LMCA | — | 37.3% |
| ForecastBench | 61.7 | — |
| LiveBench | 69% | — |
Math Kimi K2.6 leads
GPT-4.5: 32.6 (#211), Kimi K2.6: 57.0 (#41)
| Benchmark | GPT-4.5 | Kimi K2.6 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 37.8% | 96.1% |
| LMArena Math | 1412 | 1475 |
| FrontierMath (Tiers 1-3) | — | 57.2% |
| FrontierMath Tier 4 | — | 25.6% |
| MathArena Final-Answer Competitions | — | 72.9% |
| ProofBench | — | 16% |
| LiveBench Math | 69.3% | — |
| MATH Level 5 | 78.6% | — |
| FrontierMath (Feb 2025 set) | — | 39% |
| FrontierMath Tier 4 (v1) | — | 14.6% |
Knowledge Kimi K2.6 leads
GPT-4.5: 32.5 (#211), Kimi K2.6: 54.0 (#54)
| Benchmark | GPT-4.5 | Kimi K2.6 |
|---|---|---|
| GPQA Diamond | 68.7% | 90.8% |
| LMArena Expert | 1394 | 1491 |
| Humanity's Last Exam | 5.4% | — |
| SimpleQA Verified | — | 34.9% |
| Confabulations | 13.6% | — |
| Vectara Hallucination Rate | — | 10.8% |
Multimodal GPT-4.5 leads
GPT-4.5: 37.6 (#71), Kimi K2.6: 31.6 (#103)
| Benchmark | GPT-4.5 | Kimi K2.6 |
|---|---|---|
| LMArena Vision | 1195 | 1283 |
| VPCT | 45% | — |
| Blueprint-Bench 2 | — | 3.9% |
| Furniture Assembly | — | 21.7% |
| LMArena Document | — | 1451 |
Multilingual Kimi K2.6 leads
GPT-4.5: 52.5 (#83), Kimi K2.6: 54.9 (#37)
| Benchmark | GPT-4.5 | Kimi K2.6 |
|---|---|---|
| LMArena Non-English | 1413 | 1446 |
| LMArena Chinese | 1421 | 1521 |
| LMArena French | 1418 | 1471 |
| LMArena German | 1457 | 1450 |
| LMArena Japanese | 1416 | 1443 |
| LMArena Korean | 1392 | 1427 |
| LMArena Russian | 1419 | 1446 |
| LMArena Spanish | — | 1464 |
Instruction Following Kimi K2.6 leads
GPT-4.5: 72.6 (#134), Kimi K2.6: 76.3 (#43)
| Benchmark | GPT-4.5 | Kimi K2.6 |
|---|---|---|
| LMArena Instruction Following | 1404 | 1451 |
| LiveBench Instruction Following | 72.3% | — |
Long Context Kimi K2.6 leads
GPT-4.5: 40.4 (#155), Kimi K2.6: 44.9 (#52)
| Benchmark | GPT-4.5 | Kimi K2.6 |
|---|---|---|
| LMArena Longer Query | 1406 | 1468 |
| Fiction.LiveBench | 63.9% | — |
Writing & Preference Kimi K2.6 leads
GPT-4.5: 56.9 (#134), Kimi K2.6: 68.5 (#26)
| Benchmark | GPT-4.5 | Kimi K2.6 |
|---|---|---|
| LMArena Text | 1417 | 1455 |
| LMArena Creative Writing | 1394 | 1434 |
| EQ-Bench Creative Writing | 1258 | 1725 |
| LMArena Multi-Turn | 1444 | 1453 |
| Short-Story Creative Writing | 75.6% | — |
| EQ-Bench 4 | — | 1202 |
| LiveBench Language | 61.5% | — |
Frequently asked questions
Is GPT-4.5 better than Kimi K2.6?
Kimi K2.6 is the stronger model overall, scoring 47.7 to 37.2 on the Noometry Index.
Is GPT-4.5 or Kimi K2.6 better for coding?
Kimi K2.6 scores higher on coding benchmarks: 50.7 versus 42.2 in the Noometry coding category.
How many benchmarks do GPT-4.5 and Kimi K2.6 share?
22 benchmarks have published results for both models. GPT-4.5 has 42 scored results on Noometry and Kimi K2.6 has 51.