# Amazon Nova Pro vs GPT-5.3 Codex

> GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 30.5 on the Noometry Index. Amazon Nova Pro costs 3.4× less per token, which makes it the better buy when GPT-5.3 Codex's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/amazon-nova-pro-vs-gpt-5-3-codex
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. Amazon Nova Pro scores higher in 0 categories and GPT-5.3 Codex in 2 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where GPT-5.3 Codex leads 47.8 to 16.6.
- Amazon Nova Pro is cheaper at $0.80 / $3.20 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Codex.
- GPT-5.3 Codex accepts more context: 400K tokens versus 300K.

## Snapshot

| | Amazon Nova Pro | GPT-5.3 Codex |
|---|---|---|
| Provider | Amazon | OpenAI |
| Noometry Index | 30.5 | 45.5 |
| Rank | 278 | 61 |
| Context | 300K | 400K |
| Input $/M | $0.80 | $1.75 |
| Output $/M | $3.20 | $14 |
| Weights | Proprietary | Proprietary |

## Coding

- Amazon Nova Pro: 34.6 (#224)
- GPT-5.3 Codex: 48.5 (#51)

| Benchmark | Amazon Nova Pro | GPT-5.3 Codex |
|---|---|---|
| SWE-bench Verified | — | 74.8% |
| LMArena WebDev | — | 1408 |
| WeirdML | — | 79.3% |
| LiveBench Coding | 38.1% | — |
| LMArena Coding | 1270 | — |
| ALE-Bench | — | 1,655 |

## Agentic & Tool Use

- Amazon Nova Pro: 16.6 (#139)
- GPT-5.3 Codex: 47.8 (#9)

| Benchmark | Amazon Nova Pro | GPT-5.3 Codex |
|---|---|---|
| Terminal-Bench | — | 78.4% |
| Berkeley Function Calling Leaderboard | 25% | — |
| TheAgentCompany | 1.7% | — |
| METR Time Horizons | — | 74.5% |
| Vending-Bench 2 | — | 5,940 |

## Reasoning

- Amazon Nova Pro: 19.2 (#240)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Pro | GPT-5.3 Codex |
|---|---|---|
| Epoch Capabilities Index | 123.75 | 156.84 |
| LiveBench Reasoning | 32.6% | — |
| LMArena Hard Prompts | 1246 | — |
| LiveBench Data Analysis | 48.3% | — |
| LiveBench | 43.5% | — |

## Math

- Amazon Nova Pro: 26.4 (#240)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Pro | GPT-5.3 Codex |
|---|---|---|
| Omni-MATH | 24.2% | — |
| LiveBench Math | 38% | — |
| LMArena Math | 1252 | — |

## Knowledge

- Amazon Nova Pro: 27.1 (#246)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Pro | GPT-5.3 Codex |
|---|---|---|
| Humanity's Last Exam | 4.4% | — |
| MMLU-Pro | 67.3% | — |
| Confabulations | 30.1% | — |
| Vectara Hallucination Rate | 5.1% | — |
| GPQA (HELM) | 44.6% | — |
| LMArena Expert | 1211 | — |
| MMLU | 82% | — |

## Multimodal

- Amazon Nova Pro: 24.5 (#121)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Pro | GPT-5.3 Codex |
|---|---|---|
| LMArena Vision | 980 | — |

## Multilingual

- Amazon Nova Pro: 39.9 (#218)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Pro | GPT-5.3 Codex |
|---|---|---|
| LMArena Non-English | 1234 | — |
| LMArena Chinese | 1244 | — |
| LMArena French | 1270 | — |
| LMArena German | 1243 | — |
| LMArena Japanese | 1200 | — |
| LMArena Korean | 1203 | — |
| LMArena Russian | 1240 | — |
| LMArena Spanish | 1182 | — |

## Instruction Following

- Amazon Nova Pro: 65.1 (#221)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Pro | GPT-5.3 Codex |
|---|---|---|
| LiveBench Instruction Following | 67.1% | — |
| IFEval | 81.5% | — |
| LMArena Instruction Following | 1235 | — |

## Long Context

- Amazon Nova Pro: 38.1 (#199)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Pro | GPT-5.3 Codex |
|---|---|---|
| LMArena Longer Query | 1255 | — |

## Writing & Preference

- Amazon Nova Pro: 44.1 (#221)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Pro | GPT-5.3 Codex |
|---|---|---|
| LMArena Text | 1259 | — |
| LMArena Creative Writing | 1212 | — |
| Short-Story Creative Writing | 60.5% | — |
| WildBench | 77.7% | — |
| LMArena Multi-Turn | 1245 | — |
| LiveBench Language | 37% | — |

## FAQ

### Is Amazon Nova Pro better than GPT-5.3 Codex?

GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 30.5 on the Noometry Index. Amazon Nova Pro costs 3.4× less per token, which makes it the better buy when GPT-5.3 Codex's lead doesn't matter for your workload.

### Which is cheaper, Amazon Nova Pro or GPT-5.3 Codex?

Amazon Nova Pro is cheaper. It lists at $0.80 per million input tokens and $3.20 per million output tokens; GPT-5.3 Codex lists at $1.75 and $14.

### Is Amazon Nova Pro or GPT-5.3 Codex better for coding?

GPT-5.3 Codex scores higher on coding benchmarks: 48.5 versus 34.6 in the Noometry coding category.

### Which has the bigger context window?

GPT-5.3 Codex does, with 400K tokens against 300K.

### How many benchmarks do Amazon Nova Pro and GPT-5.3 Codex share?

1 benchmark has published results for both models. Amazon Nova Pro has 38 scored results on Noometry and GPT-5.3 Codex has 8.