# Gemma 3 1B vs GPT-5.1-Codex

> GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 21.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemma-3-1b-vs-gpt-5-1-codex
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in agentic & tool use, where GPT-5.1-Codex leads 38.0 to 13.7.
- Gemma 3 1B has downloadable open weights; the other is API-only.

## Snapshot

| | Gemma 3 1B | GPT-5.1-Codex |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 21.1 | 38.6 |
| Rank | 353 | 186 |
| Context | — | 400K |
| Input $/M | — | $1.25 |
| Output $/M | — | $10 |
| Weights | Open | Proprietary |

## Coding

- Gemma 3 1B: —
- GPT-5.1-Codex: 41.9 (#116)

| Benchmark | Gemma 3 1B | GPT-5.1-Codex |
|---|---|---|
| SWE-bench Verified (bash only) | — | 66% |
| LMArena WebDev | — | 1337 |
| ALE-Bench | — | 1,245 |

## Agentic & Tool Use

- Gemma 3 1B: 13.7 (#152)
- GPT-5.1-Codex: 38.0 (#33)

| Benchmark | Gemma 3 1B | GPT-5.1-Codex |
|---|---|---|
| Terminal-Bench | — | 60.4% |
| Berkeley Function Calling Leaderboard | 7.2% | — |
| METR Time Horizons | — | 70.8% |

## Reasoning

- Gemma 3 1B: 19.2 (#264)
- GPT-5.1-Codex: —

| Benchmark | Gemma 3 1B | GPT-5.1-Codex |
|---|---|---|
| Chess Puzzles | 0% | — |

## Math

- Gemma 3 1B: 10.2 (#316)
- GPT-5.1-Codex: 30.3 (#235)

| Benchmark | Gemma 3 1B | GPT-5.1-Codex |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 1.1% | — |
| ProofBench | — | 9% |

## Knowledge

- Gemma 3 1B: 7.0 (#314)
- GPT-5.1-Codex: —

| Benchmark | Gemma 3 1B | GPT-5.1-Codex |
|---|---|---|
| GPQA Diamond | 19.9% | — |

## FAQ

### Is Gemma 3 1B better than GPT-5.1-Codex?

GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 21.1 on the Noometry Index.

### How many benchmarks do Gemma 3 1B and GPT-5.1-Codex share?

0 benchmarks have published results for both models. Gemma 3 1B has 4 scored results on Noometry and GPT-5.1-Codex has 6.