# GPT-5.1-Codex vs Olmo 3.1 32b Think

> GPT-5.1-Codex and Olmo 3.1 32b Think score almost the same on the Noometry Index (38.2 vs 37.3), so choose on price, context window or the category you care about most.

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

## Summary

- The widest gap is in coding, where GPT-5.1-Codex leads 41.7 to 37.1.
- Olmo 3.1 32b Think has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.1-Codex | Olmo 3.1 32b Think |
|---|---|---|
| Provider | OpenAI | Allen Institute for AI (Ai2) |
| Noometry Index | 38.2 | 37.3 |
| Rank | 178 | 191 |
| Context | 400K | — |
| Input $/M | $1.25 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.1-Codex: 41.7 (#107)
- Olmo 3.1 32b Think: 37.1 (#186)

| Benchmark | GPT-5.1-Codex | Olmo 3.1 32b Think |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| LMArena Coding | — | 1292 |
| ALE-Bench | 1,245 | — |

## Agentic & Tool Use

- GPT-5.1-Codex: 37.8 (#32)
- Olmo 3.1 32b Think: —

| Benchmark | GPT-5.1-Codex | Olmo 3.1 32b Think |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |

## Reasoning

- GPT-5.1-Codex: —
- Olmo 3.1 32b Think: 24.1 (#151)

| Benchmark | GPT-5.1-Codex | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Hard Prompts | — | 1272 |

## Math

- GPT-5.1-Codex: 29.3 (#218)
- Olmo 3.1 32b Think: 33.6 (#170)

| Benchmark | GPT-5.1-Codex | Olmo 3.1 32b Think |
|---|---|---|
| ProofBench | 9% | — |
| LMArena Math | — | 1305 |

## Knowledge

- GPT-5.1-Codex: —
- Olmo 3.1 32b Think: 35.0 (#178)

| Benchmark | GPT-5.1-Codex | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Expert | — | 1294 |

## Multilingual

- GPT-5.1-Codex: —
- Olmo 3.1 32b Think: 38.3 (#226)

| Benchmark | GPT-5.1-Codex | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Non-English | — | 1210 |
| LMArena Chinese | — | 1241 |
| LMArena French | — | 1262 |
| LMArena German | — | 1260 |
| LMArena Russian | — | 1193 |
| LMArena Spanish | — | 1288 |

## Instruction Following

- GPT-5.1-Codex: —
- Olmo 3.1 32b Think: 65.8 (#213)

| Benchmark | GPT-5.1-Codex | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Instruction Following | — | 1246 |

## Long Context

- GPT-5.1-Codex: —
- Olmo 3.1 32b Think: 38.6 (#190)

| Benchmark | GPT-5.1-Codex | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Longer Query | — | 1272 |

## Writing & Preference

- GPT-5.1-Codex: —
- Olmo 3.1 32b Think: 46.4 (#215)

| Benchmark | GPT-5.1-Codex | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Text | — | 1271 |
| LMArena Creative Writing | — | 1226 |
| LMArena Multi-Turn | — | 1252 |

## FAQ

### Is GPT-5.1-Codex better than Olmo 3.1 32b Think?

GPT-5.1-Codex and Olmo 3.1 32b Think score almost the same on the Noometry Index (38.2 vs 37.3), so choose on price, context window or the category you care about most.

### Is GPT-5.1-Codex or Olmo 3.1 32b Think better for coding?

GPT-5.1-Codex scores higher on coding benchmarks: 41.7 versus 37.1 in the Noometry coding category.

### How many benchmarks do GPT-5.1-Codex and Olmo 3.1 32b Think share?

0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Olmo 3.1 32b Think has 15.