# GPT-4.5 vs Kimi K2 Thinking Turbo

> Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.8 to 37.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-4-5-vs-kimi-k2-thinking-turbo
- Last updated: 2026-10-12
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. GPT-4.5 scores higher in 2 categories and Kimi K2 Thinking Turbo in 6 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Kimi K2 Thinking Turbo leads 32.5 to 13.9.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 37.8% for GPT-4.5 and 83.1% for Kimi K2 Thinking Turbo.
- Kimi K2 Thinking Turbo has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-4.5 | Kimi K2 Thinking Turbo |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 37.2 | 45.8 |
| Rank | 208 | 70 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Open |

## Coding

- GPT-4.5: 42.2 (#109)
- Kimi K2 Thinking Turbo: 38.4 (#178)

| Benchmark | GPT-4.5 | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Coding | 1396 | 1454 |
| Aider Polyglot | 44.9% | — |
| LMArena WebDev | — | 1322 |
| WeirdML | 39.4% | — |
| LiveBench Coding | 75.2% | — |

## Agentic & Tool Use

- GPT-4.5: 27.9 (#97)
- Kimi K2 Thinking Turbo: —

| Benchmark | GPT-4.5 | Kimi K2 Thinking Turbo |
|---|---|---|
| Cybench | 17.5% | — |

## Reasoning

- GPT-4.5: 13.9 (#330)
- Kimi K2 Thinking Turbo: 32.5 (#75)

| Benchmark | GPT-4.5 | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Hard Prompts | 1403 | 1428 |
| ARC-AGI-2 | 0.8% | — |
| SimpleBench | 34.5% | — |
| ARC-AGI-1 | 10.3% | — |
| Chess Puzzles | — | 20% |
| EnigmaEval | 3.2% | — |
| LiveBench Reasoning | 71.1% | — |
| LiveBench Data Analysis | 64.3% | — |
| Epoch Capabilities Index | 136.74 | — |
| ForecastBench | 61.7 | — |
| LiveBench | 69% | — |

## Math

- GPT-4.5: 32.6 (#211)
- Kimi K2 Thinking Turbo: 47.4 (#68)

| Benchmark | GPT-4.5 | Kimi K2 Thinking Turbo |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 37.8% | 83.1% |
| LMArena Math | 1412 | 1429 |
| LiveBench Math | 69.3% | — |
| MATH Level 5 | 78.6% | — |

## Knowledge

- GPT-4.5: 32.5 (#211)
- Kimi K2 Thinking Turbo: 50.9 (#69)

| Benchmark | GPT-4.5 | Kimi K2 Thinking Turbo |
|---|---|---|
| GPQA Diamond | 68.7% | 84.2% |
| LMArena Expert | 1394 | 1439 |
| Humanity's Last Exam | 5.4% | — |
| Confabulations | 13.6% | — |

## Multimodal

- GPT-4.5: 37.6 (#71)
- Kimi K2 Thinking Turbo: —

| Benchmark | GPT-4.5 | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Vision | 1195 | — |
| VPCT | 45% | — |

## Multilingual

- GPT-4.5: 52.5 (#83)
- Kimi K2 Thinking Turbo: 51.4 (#109)

| Benchmark | GPT-4.5 | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Non-English | 1413 | 1398 |
| LMArena Chinese | 1421 | 1456 |
| LMArena French | 1418 | 1425 |
| LMArena German | 1457 | 1390 |
| LMArena Japanese | 1416 | 1357 |
| LMArena Korean | 1392 | 1330 |
| LMArena Russian | 1419 | 1391 |
| LMArena Spanish | — | 1406 |

## Instruction Following

- GPT-4.5: 72.6 (#134)
- Kimi K2 Thinking Turbo: 74.0 (#109)

| Benchmark | GPT-4.5 | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Instruction Following | 1404 | 1403 |
| LiveBench Instruction Following | 72.3% | — |

## Long Context

- GPT-4.5: 40.4 (#155)
- Kimi K2 Thinking Turbo: 43.2 (#102)

| Benchmark | GPT-4.5 | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Longer Query | 1406 | 1415 |
| Fiction.LiveBench | 63.9% | — |

## Writing & Preference

- GPT-4.5: 56.9 (#134)
- Kimi K2 Thinking Turbo: 60.0 (#104)

| Benchmark | GPT-4.5 | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Text | 1417 | 1415 |
| LMArena Creative Writing | 1394 | 1374 |
| LMArena Multi-Turn | 1444 | 1414 |
| Short-Story Creative Writing | 75.6% | — |
| EQ-Bench Creative Writing | 1258 | — |
| LiveBench Language | 61.5% | — |

## FAQ

### Is GPT-4.5 better than Kimi K2 Thinking Turbo?

Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.8 to 37.2 on the Noometry Index.

### Is GPT-4.5 or Kimi K2 Thinking Turbo better for coding?

GPT-4.5 scores higher on coding benchmarks: 42.2 versus 38.4 in the Noometry coding category.

### How many benchmarks do GPT-4.5 and Kimi K2 Thinking Turbo share?

18 benchmarks have published results for both models. GPT-4.5 has 42 scored results on Noometry and Kimi K2 Thinking Turbo has 21.