# Amazon Nova Micro vs GPT-5.3 Codex

> GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 30.4 on the Noometry Index. Amazon Nova Micro costs 79× 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-micro-vs-gpt-5-3-codex
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in agentic & tool use, where GPT-5.3 Codex leads 48.0 to 22.1.
- Amazon Nova Micro is cheaper at $0.035 / $0.14 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Codex.
- GPT-5.3 Codex accepts more context: 400K tokens versus 128K.

## Snapshot

| | Amazon Nova Micro | GPT-5.3 Codex |
|---|---|---|
| Provider | Amazon | OpenAI |
| Noometry Index | 30.4 | 45.8 |
| Rank | 294 | 69 |
| Context | 128K | 400K |
| Input $/M | $0.035 | $1.75 |
| Output $/M | $0.14 | $14 |
| Weights | Proprietary | Proprietary |

## Coding

- Amazon Nova Micro: 30.5 (#295)
- GPT-5.3 Codex: 48.6 (#56)

| Benchmark | Amazon Nova Micro | GPT-5.3 Codex |
|---|---|---|
| SWE-bench Verified | — | 74.8% |
| LMArena WebDev | — | 1409 |
| WeirdML | — | 79.3% |
| LiveBench Coding | 20.2% | — |
| LMArena Coding | 1218 | — |
| ALE-Bench | — | 1,655 |

## Agentic & Tool Use

- Amazon Nova Micro: 22.1 (#132)
- GPT-5.3 Codex: 48.0 (#9)

| Benchmark | Amazon Nova Micro | GPT-5.3 Codex |
|---|---|---|
| Terminal-Bench | — | 78.4% |
| Berkeley Function Calling Leaderboard | 22.3% | — |
| METR Time Horizons | — | 74.5% |
| Vending-Bench 2 | — | 5,940 |

## Reasoning

- Amazon Nova Micro: 17.4 (#294)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Micro | GPT-5.3 Codex |
|---|---|---|
| LiveBench Reasoning | 25.1% | — |
| LMArena Hard Prompts | 1191 | — |
| LiveBench Data Analysis | 34% | — |
| Epoch Capabilities Index | — | 156.77 |
| LiveBench | 29.6% | — |

## Math

- Amazon Nova Micro: 26.9 (#254)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Micro | GPT-5.3 Codex |
|---|---|---|
| Omni-MATH | 21.4% | — |
| LiveBench Math | 34.5% | — |
| LMArena Math | 1206 | — |

## Knowledge

- Amazon Nova Micro: 29.6 (#237)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Micro | GPT-5.3 Codex |
|---|---|---|
| MMLU-Pro | 51.1% | — |
| Vectara Hallucination Rate | 5.5% | — |
| GPQA (HELM) | 38.3% | — |
| LMArena Expert | 1184 | — |
| MMLU | 70.8% | — |

## Multilingual

- Amazon Nova Micro: 36.5 (#239)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Micro | GPT-5.3 Codex |
|---|---|---|
| LMArena Non-English | 1186 | — |
| LMArena Chinese | 1209 | — |
| LMArena French | 1238 | — |
| LMArena German | 1192 | — |
| LMArena Japanese | 1154 | — |
| LMArena Korean | 1150 | — |
| LMArena Russian | 1185 | — |
| LMArena Spanish | 1225 | — |

## Instruction Following

- Amazon Nova Micro: 56.3 (#272)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Micro | GPT-5.3 Codex |
|---|---|---|
| LiveBench Instruction Following | 48% | — |
| IFEval | 76% | — |
| LMArena Instruction Following | 1174 | — |

## Long Context

- Amazon Nova Micro: 36.5 (#229)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Micro | GPT-5.3 Codex |
|---|---|---|
| LMArena Longer Query | 1205 | — |

## Writing & Preference

- Amazon Nova Micro: 39.5 (#247)
- GPT-5.3 Codex: —

| Benchmark | Amazon Nova Micro | GPT-5.3 Codex |
|---|---|---|
| LMArena Text | 1208 | — |
| LMArena Creative Writing | 1172 | — |
| WildBench | 74.3% | — |
| LMArena Multi-Turn | 1178 | — |
| LiveBench Language | 15.8% | — |

## FAQ

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

GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 30.4 on the Noometry Index. Amazon Nova Micro costs 79× 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 Micro or GPT-5.3 Codex?

Amazon Nova Micro is cheaper. It lists at $0.035 per million input tokens and $0.14 per million output tokens; GPT-5.3 Codex lists at $1.75 and $14.

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

GPT-5.3 Codex scores higher on coding benchmarks: 48.6 versus 30.5 in the Noometry coding category.

### Which has the bigger context window?

GPT-5.3 Codex does, with 400K tokens against 128K.

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

0 benchmarks have published results for both models. Amazon Nova Micro has 32 scored results on Noometry and GPT-5.3 Codex has 8.