# Amazon Nova Experimental Chat 10 20 vs Grok 4.5

> Grok 4.5 is the stronger model overall, scoring 55.0 to 42.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/amazon-nova-experimental-chat-10-20-vs-grok-4-5
- Last updated: 2026-10-12
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Amazon Nova Experimental Chat 10 20 scores higher in 0 categories and Grok 4.5 in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.5 leads 56.1 to 28.4.

## Snapshot

| | Amazon Nova Experimental Chat 10 20 | Grok 4.5 |
|---|---|---|
| Provider | Amazon | xAI |
| Noometry Index | 42.1 | 55.0 |
| Rank | 118 | 25 |
| Context | — | 500K |
| Input $/M | — | $2 |
| Output $/M | — | $6 |
| Weights | Proprietary | Proprietary |

## Coding

- Amazon Nova Experimental Chat 10 20: 41.6 (#123)
- Grok 4.5: 52.2 (#35)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4.5 |
|---|---|---|
| LMArena Coding | 1412 | 1474 |
| DeepSWE | — | 53.8% |
| FrontierCode | — | 42.4% |
| LMArena WebDev | — | 1553 |
| SciCode | — | 54.1% |
| WeirdML | — | 46.4% |
| ALE-Bench | — | 1,309 |

## Agentic & Tool Use

- Amazon Nova Experimental Chat 10 20: —
- Grok 4.5: 44.4 (#17)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4.5 |
|---|---|---|
| APEX-Agents | — | 56.2% |
| τ²-bench Banking | — | 47.9% |
| PostTrainBench | — | 23.4% |
| GBAEval | — | 65.4% |
| GDP.pdf | — | 14% |
| LMArena Search | — | 1213 |
| Vending-Bench 2 | — | 3,887 |

## Reasoning

- Amazon Nova Experimental Chat 10 20: 28.4 (#106)
- Grok 4.5: 56.1 (#25)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4.5 |
|---|---|---|
| LMArena Hard Prompts | 1396 | 1462 |
| ARC-AGI-2 | — | 52.6% |
| SimpleBench | — | 70% |
| Kagi LLM Benchmark | — | 83.5% |
| NYT Connections (extended) | — | 79.9% |
| ARC-AGI-1 | — | 87.2% |
| CritPt | — | 15.4% |
| Chess Puzzles | — | 36% |
| DTBench | — | 96.5% |
| LMCA | — | 45.2% |
| Surface Evolver Bench | — | 74.4% |
| Epoch Capabilities Index | — | 153.92 |

## Math

- Amazon Nova Experimental Chat 10 20: 39.0 (#119)
- Grok 4.5: 60.9 (#35)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4.5 |
|---|---|---|
| LMArena Math | 1425 | 1459 |
| FrontierMath (Tiers 1-3) | — | 57.2% |
| FrontierMath Tier 4 | — | 24.4% |
| OTIS Mock AIME 2024-2025 | — | 97.8% |
| ProofBench | — | 31% |

## Knowledge

- Amazon Nova Experimental Chat 10 20: 38.5 (#144)
- Grok 4.5: 62.3 (#24)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4.5 |
|---|---|---|
| LMArena Expert | 1386 | 1466 |
| GPQA Diamond | — | 93.4% |
| SimpleQA Verified | — | 48.3% |

## Multimodal

- Amazon Nova Experimental Chat 10 20: —
- Grok 4.5: 37.6 (#72)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4.5 |
|---|---|---|
| LMArena Vision | — | 1288 |
| Blueprint-Bench 2 | — | 27.3% |
| Furniture Assembly | — | 22.5% |
| LMArena Document | — | 1452 |

## Multilingual

- Amazon Nova Experimental Chat 10 20: 49.5 (#131)
- Grok 4.5: 54.4 (#42)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4.5 |
|---|---|---|
| LMArena Non-English | 1372 | 1440 |
| LMArena Chinese | 1404 | 1496 |
| LMArena French | 1425 | 1456 |
| LMArena German | 1391 | 1446 |
| LMArena Japanese | 1360 | 1428 |
| LMArena Korean | 1324 | 1404 |
| LMArena Russian | 1371 | 1448 |
| LMArena Spanish | 1382 | 1450 |

## Instruction Following

- Amazon Nova Experimental Chat 10 20: 72.1 (#141)
- Grok 4.5: 76.0 (#48)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4.5 |
|---|---|---|
| LMArena Instruction Following | 1365 | 1446 |

## Long Context

- Amazon Nova Experimental Chat 10 20: 41.7 (#133)
- Grok 4.5: 44.8 (#56)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4.5 |
|---|---|---|
| LMArena Longer Query | 1370 | 1463 |

## Writing & Preference

- Amazon Nova Experimental Chat 10 20: 56.6 (#136)
- Grok 4.5: 65.8 (#42)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4.5 |
|---|---|---|
| LMArena Text | 1394 | 1448 |
| LMArena Creative Writing | 1318 | 1442 |
| LMArena Multi-Turn | 1364 | 1456 |
| EQ-Bench Creative Writing | — | 1579 |

## FAQ

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

Grok 4.5 is the stronger model overall, scoring 55.0 to 42.1 on the Noometry Index.

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

Grok 4.5 scores higher on coding benchmarks: 52.2 versus 41.6 in the Noometry coding category.

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

17 benchmarks have published results for both models. Amazon Nova Experimental Chat 10 20 has 17 scored results on Noometry and Grok 4.5 has 52.