# GPT-5.1-Codex vs Olmo 2 0325 32b Instruct

> GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 32.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-1-codex-vs-olmo-2-0325-32b-instruct
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where GPT-5.1-Codex leads 41.7 to 34.6.
- Olmo 2 0325 32b Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.1-Codex | Olmo 2 0325 32b Instruct |
|---|---|---|
| Provider | OpenAI | Allen Institute for AI (Ai2) |
| Noometry Index | 38.2 | 32.2 |
| Rank | 178 | 248 |
| Context | 400K | — |
| Input $/M | $1.25 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.1-Codex: 41.7 (#107)
- Olmo 2 0325 32b Instruct: 34.6 (#222)

| Benchmark | GPT-5.1-Codex | Olmo 2 0325 32b Instruct |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| LMArena Coding | — | 1210 |
| ALE-Bench | 1,245 | — |

## Agentic & Tool Use

- GPT-5.1-Codex: 37.8 (#32)
- Olmo 2 0325 32b Instruct: —

| Benchmark | GPT-5.1-Codex | Olmo 2 0325 32b Instruct |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |

## Reasoning

- GPT-5.1-Codex: —
- Olmo 2 0325 32b Instruct: 22.6 (#174)

| Benchmark | GPT-5.1-Codex | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Hard Prompts | — | 1208 |

## Math

- GPT-5.1-Codex: 29.3 (#218)
- Olmo 2 0325 32b Instruct: 24.8 (#255)

| Benchmark | GPT-5.1-Codex | Olmo 2 0325 32b Instruct |
|---|---|---|
| ProofBench | 9% | — |
| Omni-MATH | — | 16.1% |
| LMArena Math | — | 1208 |

## Knowledge

- GPT-5.1-Codex: —
- Olmo 2 0325 32b Instruct: 19.2 (#274)

| Benchmark | GPT-5.1-Codex | Olmo 2 0325 32b Instruct |
|---|---|---|
| MMLU-Pro | — | 41.4% |
| GPQA (HELM) | — | 28.7% |

## Multilingual

- GPT-5.1-Codex: —
- Olmo 2 0325 32b Instruct: 35.0 (#243)

| Benchmark | GPT-5.1-Codex | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Non-English | — | 1160 |
| LMArena Chinese | — | 1192 |
| LMArena Russian | — | 1187 |

## Instruction Following

- GPT-5.1-Codex: —
- Olmo 2 0325 32b Instruct: 61.8 (#238)

| Benchmark | GPT-5.1-Codex | Olmo 2 0325 32b Instruct |
|---|---|---|
| IFEval | — | 78% |
| LMArena Instruction Following | — | 1186 |

## Long Context

- GPT-5.1-Codex: —
- Olmo 2 0325 32b Instruct: 36.2 (#229)

| Benchmark | GPT-5.1-Codex | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Longer Query | — | 1194 |

## Writing & Preference

- GPT-5.1-Codex: —
- Olmo 2 0325 32b Instruct: 42.3 (#231)

| Benchmark | GPT-5.1-Codex | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Text | — | 1218 |
| LMArena Creative Writing | — | 1199 |
| WildBench | — | 73.4% |
| LMArena Multi-Turn | — | 1221 |

## FAQ

### Is GPT-5.1-Codex better than Olmo 2 0325 32b Instruct?

GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 32.2 on the Noometry Index.

### Is GPT-5.1-Codex or Olmo 2 0325 32b Instruct better for coding?

GPT-5.1-Codex scores higher on coding benchmarks: 41.7 versus 34.6 in the Noometry coding category.

### How many benchmarks do GPT-5.1-Codex and Olmo 2 0325 32b Instruct share?

0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Olmo 2 0325 32b Instruct has 16.