# Gemma 2B vs GPT-5.3 Codex

> GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 29.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemma-2b-vs-gpt-5-3-codex
- Last updated: 2026-10-11
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. Gemma 2B scores higher in 0 categories and GPT-5.3 Codex in 1 category; one gap is clear of the uncertainty.
- The widest gap is in coding, where GPT-5.3 Codex leads 48.6 to 29.4.
- Gemma 2B has downloadable open weights; the other is API-only.

## Snapshot

| | Gemma 2B | GPT-5.3 Codex |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 29.6 | 45.8 |
| Rank | 307 | 69 |
| Context | — | 400K |
| Input $/M | — | $1.75 |
| Output $/M | — | $14 |
| Weights | Open | Proprietary |

## Coding

- Gemma 2B: 29.4 (#305)
- GPT-5.3 Codex: 48.6 (#56)

| Benchmark | Gemma 2B | GPT-5.3 Codex |
|---|---|---|
| SWE-bench Verified | — | 74.8% |
| LMArena WebDev | — | 1409 |
| WeirdML | — | 79.3% |
| LMArena Coding | 1010 | — |
| ALE-Bench | — | 1,655 |
| HumanEval+ | 20.7% | — |
| MBPP+ | 34.1% | — |

## Agentic & Tool Use

- Gemma 2B: —
- GPT-5.3 Codex: 48.0 (#9)

| Benchmark | Gemma 2B | GPT-5.3 Codex |
|---|---|---|
| Terminal-Bench | — | 78.4% |
| METR Time Horizons | — | 74.5% |
| Vending-Bench 2 | — | 5,940 |

## Reasoning

- Gemma 2B: 18.8 (#275)
- GPT-5.3 Codex: —

| Benchmark | Gemma 2B | GPT-5.3 Codex |
|---|---|---|
| Epoch Capabilities Index | 94.2 | 156.77 |
| LMArena Hard Prompts | 989 | — |
| BIG-Bench Hard | 35.2% | — |
| HellaSwag | 71.4% | — |
| PIQA | 77.3% | — |
| WinoGrande | 65.4% | — |

## Math

- Gemma 2B: 30.0 (#239)
- GPT-5.3 Codex: —

| Benchmark | Gemma 2B | GPT-5.3 Codex |
|---|---|---|
| LMArena Math | 1009 | — |
| GSM8K | 17.7% | — |

## Knowledge

- Gemma 2B: —
- GPT-5.3 Codex: —

| Benchmark | Gemma 2B | GPT-5.3 Codex |
|---|---|---|
| ARC (AI2) Challenge | 42.1% | — |
| BoolQ | 69.4% | — |
| MMLU | 42.3% | — |
| TriviaQA | 53.2% | — |

## Multilingual

- Gemma 2B: 23.0 (#294)
- GPT-5.3 Codex: —

| Benchmark | Gemma 2B | GPT-5.3 Codex |
|---|---|---|
| LMArena Non-English | 958 | — |
| LMArena Chinese | 986 | — |
| LMArena Russian | 937 | — |

## Instruction Following

- Gemma 2B: 48.5 (#302)
- GPT-5.3 Codex: —

| Benchmark | Gemma 2B | GPT-5.3 Codex |
|---|---|---|
| LMArena Instruction Following | 970 | — |

## Long Context

- Gemma 2B: 29.9 (#291)
- GPT-5.3 Codex: —

| Benchmark | Gemma 2B | GPT-5.3 Codex |
|---|---|---|
| LMArena Longer Query | 981 | — |

## Writing & Preference

- Gemma 2B: 24.0 (#308)
- GPT-5.3 Codex: —

| Benchmark | Gemma 2B | GPT-5.3 Codex |
|---|---|---|
| LMArena Text | 1002 | — |
| LMArena Creative Writing | 987 | — |
| LMArena Multi-Turn | 945 | — |

## FAQ

### Is Gemma 2B better than GPT-5.3 Codex?

GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 29.6 on the Noometry Index.

### Is Gemma 2B or GPT-5.3 Codex better for coding?

GPT-5.3 Codex scores higher on coding benchmarks: 48.6 versus 29.4 in the Noometry coding category.

### How many benchmarks do Gemma 2B and GPT-5.3 Codex share?

1 benchmark has published results for both models. Gemma 2B has 23 scored results on Noometry and GPT-5.3 Codex has 8.