# Amazon Nova Experimental Chat 10 09 vs GPT-5.3 Codex

> GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 41.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/amazon-nova-experimental-chat-10-09-vs-gpt-5-3-codex
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where GPT-5.3 Codex leads 48.5 to 39.6.

## Snapshot

| | Amazon Nova Experimental Chat 10 09 | GPT-5.3 Codex |
|---|---|---|
| Provider | Amazon | OpenAI |
| Noometry Index | 41.4 | 45.5 |
| Rank | 124 | 61 |
| Context | — | 400K |
| Input $/M | — | $1.75 |
| Output $/M | — | $14 |
| Weights | Proprietary | Proprietary |

## Coding

- Amazon Nova Experimental Chat 10 09: 39.6 (#142)
- GPT-5.3 Codex: 48.5 (#51)

| Benchmark | Amazon Nova Experimental Chat 10 09 | GPT-5.3 Codex |
|---|---|---|
| SWE-bench Verified | — | 74.8% |
| LMArena WebDev | — | 1408 |
| WeirdML | — | 79.3% |
| LMArena Coding | 1371 | — |
| ALE-Bench | — | 1,655 |

## Agentic & Tool Use

- Amazon Nova Experimental Chat 10 09: —
- GPT-5.3 Codex: 47.8 (#9)

| Benchmark | Amazon Nova Experimental Chat 10 09 | GPT-5.3 Codex |
|---|---|---|
| Terminal-Bench | — | 78.4% |
| METR Time Horizons | — | 74.5% |
| Vending-Bench 2 | — | 5,940 |

## Reasoning

- Amazon Nova Experimental Chat 10 09: 26.2 (#122)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Experimental Chat 10 09 | GPT-5.3 Codex |
|---|---|---|
| LMArena Hard Prompts | 1356 | — |
| Epoch Capabilities Index | — | 156.84 |

## Multilingual

- Amazon Nova Experimental Chat 10 09: 47.5 (#145)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Experimental Chat 10 09 | GPT-5.3 Codex |
|---|---|---|
| LMArena Non-English | 1341 | — |
| LMArena Chinese | 1345 | — |

## Instruction Following

- Amazon Nova Experimental Chat 10 09: 69.7 (#167)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Experimental Chat 10 09 | GPT-5.3 Codex |
|---|---|---|
| LMArena Instruction Following | 1316 | — |

## Long Context

- Amazon Nova Experimental Chat 10 09: 40.6 (#146)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Experimental Chat 10 09 | GPT-5.3 Codex |
|---|---|---|
| LMArena Longer Query | 1334 | — |

## Writing & Preference

- Amazon Nova Experimental Chat 10 09: 55.0 (#144)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Experimental Chat 10 09 | GPT-5.3 Codex |
|---|---|---|
| LMArena Text | 1365 | — |
| LMArena Creative Writing | 1307 | — |
| LMArena Multi-Turn | 1354 | — |

## FAQ

### Is Amazon Nova Experimental Chat 10 09 better than GPT-5.3 Codex?

GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 41.4 on the Noometry Index.

### Is Amazon Nova Experimental Chat 10 09 or GPT-5.3 Codex better for coding?

GPT-5.3 Codex scores higher on coding benchmarks: 48.5 versus 39.6 in the Noometry coding category.

### How many benchmarks do Amazon Nova Experimental Chat 10 09 and GPT-5.3 Codex share?

0 benchmarks have published results for both models. Amazon Nova Experimental Chat 10 09 has 9 scored results on Noometry and GPT-5.3 Codex has 8.