# Gemma 3 1B vs GPT-5-Codex

> GPT-5-Codex is the stronger model overall, scoring 37.3 to 20.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemma-3-1b-vs-gpt-5-codex
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in agentic & tool use, where GPT-5-Codex leads 30.8 to 13.5.
- Gemma 3 1B has downloadable open weights; the other is API-only.

## Snapshot

| | Gemma 3 1B | GPT-5-Codex |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 20.7 | 37.3 |
| Rank | 348 | 190 |
| Context | — | 400K |
| Input $/M | — | $1.25 |
| Output $/M | — | $10 |
| Weights | Open | Proprietary |

## Coding

- Gemma 3 1B: —
- GPT-5-Codex: 41.9 (#100)

| Benchmark | Gemma 3 1B | GPT-5-Codex |
|---|---|---|
| WeirdML | — | 54.5% |

## Agentic & Tool Use

- Gemma 3 1B: 13.5 (#144)
- GPT-5-Codex: 30.8 (#66)

| Benchmark | Gemma 3 1B | GPT-5-Codex |
|---|---|---|
| Terminal-Bench | — | 44.3% |
| Berkeley Function Calling Leaderboard | 7.2% | — |

## Reasoning

- Gemma 3 1B: 18.5 (#260)
- GPT-5-Codex: 30.0 (#80)

| Benchmark | Gemma 3 1B | GPT-5-Codex |
|---|---|---|
| Kagi LLM Benchmark | — | 70.3% |
| Chess Puzzles | 0% | — |

## Math

- Gemma 3 1B: 9.6 (#310)
- GPT-5-Codex: —

| Benchmark | Gemma 3 1B | GPT-5-Codex |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 1.1% | — |

## Knowledge

- Gemma 3 1B: 7.1 (#309)
- GPT-5-Codex: —

| Benchmark | Gemma 3 1B | GPT-5-Codex |
|---|---|---|
| GPQA Diamond | 19.9% | — |

## FAQ

### Is Gemma 3 1B better than GPT-5-Codex?

GPT-5-Codex is the stronger model overall, scoring 37.3 to 20.7 on the Noometry Index.

### How many benchmarks do Gemma 3 1B and GPT-5-Codex share?

0 benchmarks have published results for both models. Gemma 3 1B has 4 scored results on Noometry and GPT-5-Codex has 3.