# Amazon Nova Experimental Chat 10 20 vs GPT-5.1-Codex

> Amazon Nova Experimental Chat 10 20 is the stronger model overall, scoring 41.5 to 38.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/amazon-nova-experimental-chat-10-20-vs-gpt-5-1-codex
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where Amazon Nova Experimental Chat 10 20 leads 36.2 to 29.3.

## Snapshot

| | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| Provider | Amazon | OpenAI |
| Noometry Index | 41.5 | 38.2 |
| Rank | 122 | 178 |
| Context | — | 400K |
| Input $/M | — | $1.25 |
| Output $/M | — | $10 |
| Weights | Proprietary | Proprietary |

## Coding

- Amazon Nova Experimental Chat 10 20: 41.0 (#123)
- GPT-5.1-Codex: 41.7 (#107)

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| SWE-bench Verified (bash only) | — | 66% |
| LMArena WebDev | — | 1337 |
| LMArena Coding | 1413 | — |
| ALE-Bench | — | 1,245 |

## Agentic & Tool Use

- Amazon Nova Experimental Chat 10 20: —
- GPT-5.1-Codex: 37.8 (#32)

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| Terminal-Bench | — | 60.4% |
| METR Time Horizons | — | 70.8% |

## Reasoning

- Amazon Nova Experimental Chat 10 20: 27.3 (#110)
- GPT-5.1-Codex: —

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| LMArena Hard Prompts | 1396 | — |

## Math

- Amazon Nova Experimental Chat 10 20: 36.2 (#121)
- GPT-5.1-Codex: 29.3 (#218)

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| ProofBench | — | 9% |
| LMArena Math | 1425 | — |

## Knowledge

- Amazon Nova Experimental Chat 10 20: 37.8 (#142)
- GPT-5.1-Codex: —

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| LMArena Expert | 1385 | — |

## Multilingual

- Amazon Nova Experimental Chat 10 20: 49.7 (#127)
- GPT-5.1-Codex: —

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| LMArena Non-English | 1372 | — |
| LMArena Chinese | 1405 | — |
| LMArena French | 1426 | — |
| LMArena German | 1391 | — |
| LMArena Japanese | 1355 | — |
| LMArena Korean | 1327 | — |
| LMArena Russian | 1371 | — |
| LMArena Spanish | 1381 | — |

## Instruction Following

- Amazon Nova Experimental Chat 10 20: 72.3 (#136)
- GPT-5.1-Codex: —

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| LMArena Instruction Following | 1365 | — |

## Long Context

- Amazon Nova Experimental Chat 10 20: 41.7 (#128)
- GPT-5.1-Codex: —

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| LMArena Longer Query | 1370 | — |

## Writing & Preference

- Amazon Nova Experimental Chat 10 20: 56.9 (#131)
- GPT-5.1-Codex: —

| Benchmark | Amazon Nova Experimental Chat 10 20 | GPT-5.1-Codex |
|---|---|---|
| LMArena Text | 1394 | — |
| LMArena Creative Writing | 1318 | — |
| LMArena Multi-Turn | 1364 | — |

## FAQ

### Is Amazon Nova Experimental Chat 10 20 better than GPT-5.1-Codex?

Amazon Nova Experimental Chat 10 20 is the stronger model overall, scoring 41.5 to 38.2 on the Noometry Index.

### Is Amazon Nova Experimental Chat 10 20 or GPT-5.1-Codex better for coding?

They score almost the same on coding (41.0 vs 41.7); test both on your own repository before choosing.

### How many benchmarks do Amazon Nova Experimental Chat 10 20 and GPT-5.1-Codex share?

0 benchmarks have published results for both models. Amazon Nova Experimental Chat 10 20 has 17 scored results on Noometry and GPT-5.1-Codex has 6.