# Amazon Nova Experimental Chat 10 20 vs GPT-4.5

> Amazon Nova Experimental Chat 10 20 is the stronger model overall, scoring 42.1 to 37.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/amazon-nova-experimental-chat-10-20-vs-gpt-4-5
- Last updated: 2026-10-12
- Shared benchmarks: 16

## Summary

- They share 16 benchmarks with published results for both. Amazon Nova Experimental Chat 10 20 scores higher in 4 categories and GPT-4.5 in 4 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Amazon Nova Experimental Chat 10 20 leads 28.4 to 13.9.

## Snapshot

| | Amazon Nova Experimental Chat 10 20 | GPT-4.5 |
|---|---|---|
| Provider | Amazon | OpenAI |
| Noometry Index | 42.1 | 37.2 |
| Rank | 118 | 208 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Proprietary |

## Coding

- Amazon Nova Experimental Chat 10 20: 41.6 (#123)
- GPT-4.5: 42.2 (#109)

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-4.5 |
|---|---|---|
| LMArena Coding | 1412 | 1396 |
| Aider Polyglot | — | 44.9% |
| WeirdML | — | 39.4% |
| LiveBench Coding | — | 75.2% |

## Agentic & Tool Use

- Amazon Nova Experimental Chat 10 20: —
- GPT-4.5: 27.9 (#97)

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-4.5 |
|---|---|---|
| Cybench | — | 17.5% |

## Reasoning

- Amazon Nova Experimental Chat 10 20: 28.4 (#106)
- GPT-4.5: 13.9 (#330)

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-4.5 |
|---|---|---|
| LMArena Hard Prompts | 1396 | 1403 |
| ARC-AGI-2 | — | 0.8% |
| SimpleBench | — | 34.5% |
| ARC-AGI-1 | — | 10.3% |
| EnigmaEval | — | 3.2% |
| LiveBench Reasoning | — | 71.1% |
| LiveBench Data Analysis | — | 64.3% |
| Epoch Capabilities Index | — | 136.74 |
| ForecastBench | — | 61.7 |
| LiveBench | — | 69% |

## Math

- Amazon Nova Experimental Chat 10 20: 39.0 (#119)
- GPT-4.5: 32.6 (#211)

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-4.5 |
|---|---|---|
| LMArena Math | 1425 | 1412 |
| OTIS Mock AIME 2024-2025 | — | 37.8% |
| LiveBench Math | — | 69.3% |
| MATH Level 5 | — | 78.6% |

## Knowledge

- Amazon Nova Experimental Chat 10 20: 38.5 (#144)
- GPT-4.5: 32.5 (#211)

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-4.5 |
|---|---|---|
| LMArena Expert | 1386 | 1394 |
| GPQA Diamond | — | 68.7% |
| Humanity's Last Exam | — | 5.4% |
| Confabulations | — | 13.6% |

## Multimodal

- Amazon Nova Experimental Chat 10 20: —
- GPT-4.5: 37.6 (#71)

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-4.5 |
|---|---|---|
| LMArena Vision | — | 1195 |
| VPCT | — | 45% |

## Multilingual

- Amazon Nova Experimental Chat 10 20: 49.5 (#131)
- GPT-4.5: 52.5 (#83)

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-4.5 |
|---|---|---|
| LMArena Non-English | 1372 | 1413 |
| LMArena Chinese | 1404 | 1421 |
| LMArena French | 1425 | 1418 |
| LMArena German | 1391 | 1457 |
| LMArena Japanese | 1360 | 1416 |
| LMArena Korean | 1324 | 1392 |
| LMArena Russian | 1371 | 1419 |
| LMArena Spanish | 1382 | — |

## Instruction Following

- Amazon Nova Experimental Chat 10 20: 72.1 (#141)
- GPT-4.5: 72.6 (#134)

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-4.5 |
|---|---|---|
| LMArena Instruction Following | 1365 | 1404 |
| LiveBench Instruction Following | — | 72.3% |

## Long Context

- Amazon Nova Experimental Chat 10 20: 41.7 (#133)
- GPT-4.5: 40.4 (#155)

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-4.5 |
|---|---|---|
| LMArena Longer Query | 1370 | 1406 |
| Fiction.LiveBench | — | 63.9% |

## Writing & Preference

- Amazon Nova Experimental Chat 10 20: 56.6 (#136)
- GPT-4.5: 56.9 (#134)

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-4.5 |
|---|---|---|
| LMArena Text | 1394 | 1417 |
| LMArena Creative Writing | 1318 | 1394 |
| LMArena Multi-Turn | 1364 | 1444 |
| Short-Story Creative Writing | — | 75.6% |
| EQ-Bench Creative Writing | — | 1258 |
| LiveBench Language | — | 61.5% |

## FAQ

### Is Amazon Nova Experimental Chat 10 20 better than GPT-4.5?

Amazon Nova Experimental Chat 10 20 is the stronger model overall, scoring 42.1 to 37.2 on the Noometry Index.

### Is Amazon Nova Experimental Chat 10 20 or GPT-4.5 better for coding?

They score almost the same on coding (41.6 vs 42.2); test both on your own repository before choosing.

### How many benchmarks do Amazon Nova Experimental Chat 10 20 and GPT-4.5 share?

16 benchmarks have published results for both models. Amazon Nova Experimental Chat 10 20 has 17 scored results on Noometry and GPT-4.5 has 42.