# GPT-5-Codex vs Olmo 3.1 32b Instruct

> Olmo 3.1 32b Instruct is the stronger model overall, scoring 39.4 to 37.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-codex-vs-olmo-3-1-32b-instruct
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where GPT-5-Codex leads 30.9 to 26.4.
- Olmo 3.1 32b Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5-Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| Provider | OpenAI | Allen Institute for AI (Ai2) |
| Noometry Index | 37.9 | 39.4 |
| Rank | 192 | 168 |
| Context | 400K | — |
| Input $/M | $1.25 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5-Codex: 42.4 (#103)
- Olmo 3.1 32b Instruct: 39.5 (#157)

| Benchmark | GPT-5-Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| WeirdML | 54.5% | — |
| LMArena Coding | — | 1347 |

## Agentic & Tool Use

- GPT-5-Codex: 31.0 (#72)
- Olmo 3.1 32b Instruct: —

| Benchmark | GPT-5-Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| Terminal-Bench | 44.3% | — |

## Reasoning

- GPT-5-Codex: 30.9 (#83)
- Olmo 3.1 32b Instruct: 26.4 (#132)

| Benchmark | GPT-5-Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| Kagi LLM Benchmark | 70.3% | — |
| LMArena Hard Prompts | — | 1322 |

## Math

- GPT-5-Codex: —
- Olmo 3.1 32b Instruct: 36.3 (#167)

| Benchmark | GPT-5-Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Math | — | 1305 |

## Knowledge

- GPT-5-Codex: —
- Olmo 3.1 32b Instruct: 36.1 (#175)

| Benchmark | GPT-5-Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Expert | — | 1308 |

## Multilingual

- GPT-5-Codex: —
- Olmo 3.1 32b Instruct: 42.6 (#191)

| Benchmark | GPT-5-Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Non-English | — | 1275 |
| LMArena Chinese | — | 1304 |
| LMArena French | — | 1328 |
| LMArena German | — | 1282 |
| LMArena Korean | — | 1206 |
| LMArena Russian | — | 1268 |
| LMArena Spanish | — | 1336 |

## Instruction Following

- GPT-5-Codex: —
- Olmo 3.1 32b Instruct: 68.6 (#187)

| Benchmark | GPT-5-Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Instruction Following | — | 1299 |

## Long Context

- GPT-5-Codex: —
- Olmo 3.1 32b Instruct: 39.9 (#166)

| Benchmark | GPT-5-Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Longer Query | — | 1312 |

## Writing & Preference

- GPT-5-Codex: —
- Olmo 3.1 32b Instruct: 50.2 (#185)

| Benchmark | GPT-5-Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Text | — | 1311 |
| LMArena Creative Writing | — | 1264 |
| LMArena Multi-Turn | — | 1309 |

## FAQ

### Is GPT-5-Codex better than Olmo 3.1 32b Instruct?

Olmo 3.1 32b Instruct is the stronger model overall, scoring 39.4 to 37.9 on the Noometry Index.

### Is GPT-5-Codex or Olmo 3.1 32b Instruct better for coding?

GPT-5-Codex scores higher on coding benchmarks: 42.4 versus 39.5 in the Noometry coding category.

### How many benchmarks do GPT-5-Codex and Olmo 3.1 32b Instruct share?

0 benchmarks have published results for both models. GPT-5-Codex has 3 scored results on Noometry and Olmo 3.1 32b Instruct has 16.