# GPT-5.3 Codex vs Olmo 3.1 32b Instruct

> GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 38.8 on the Noometry Index.

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

## Summary

- The widest gap is in coding, where GPT-5.3 Codex leads 48.5 to 38.9.
- Olmo 3.1 32b Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.3 Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| Provider | OpenAI | Allen Institute for AI (Ai2) |
| Noometry Index | 45.5 | 38.8 |
| Rank | 61 | 168 |
| Context | 400K | — |
| Input $/M | $1.75 | — |
| Output $/M | $14 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.3 Codex: 48.5 (#51)
- Olmo 3.1 32b Instruct: 38.9 (#154)

| Benchmark | GPT-5.3 Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| SWE-bench Verified | 74.8% | — |
| LMArena WebDev | 1408 | — |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1346 |
| ALE-Bench | 1,655 | — |

## Agentic & Tool Use

- GPT-5.3 Codex: 47.8 (#9)
- Olmo 3.1 32b Instruct: —

| Benchmark | GPT-5.3 Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |

## Reasoning

- GPT-5.3 Codex: —
- Olmo 3.1 32b Instruct: 25.4 (#131)

| Benchmark | GPT-5.3 Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Hard Prompts | — | 1322 |
| Epoch Capabilities Index | 156.84 | — |

## Math

- GPT-5.3 Codex: —
- Olmo 3.1 32b Instruct: 33.6 (#169)

| Benchmark | GPT-5.3 Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Math | — | 1305 |

## Knowledge

- GPT-5.3 Codex: —
- Olmo 3.1 32b Instruct: 35.4 (#175)

| Benchmark | GPT-5.3 Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Expert | — | 1307 |

## Multilingual

- GPT-5.3 Codex: —
- Olmo 3.1 32b Instruct: 42.8 (#185)

| Benchmark | GPT-5.3 Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Non-English | — | 1275 |
| LMArena Chinese | — | 1304 |
| LMArena French | — | 1328 |
| LMArena German | — | 1283 |
| LMArena Korean | — | 1206 |
| LMArena Russian | — | 1268 |
| LMArena Spanish | — | 1337 |

## Instruction Following

- GPT-5.3 Codex: —
- Olmo 3.1 32b Instruct: 68.8 (#182)

| Benchmark | GPT-5.3 Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Instruction Following | — | 1298 |

## Long Context

- GPT-5.3 Codex: —
- Olmo 3.1 32b Instruct: 39.9 (#161)

| Benchmark | GPT-5.3 Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Longer Query | — | 1312 |

## Writing & Preference

- GPT-5.3 Codex: —
- Olmo 3.1 32b Instruct: 50.4 (#179)

| Benchmark | GPT-5.3 Codex | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Text | — | 1311 |
| LMArena Creative Writing | — | 1264 |
| LMArena Multi-Turn | — | 1309 |

## FAQ

### Is GPT-5.3 Codex better than Olmo 3.1 32b Instruct?

GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 38.8 on the Noometry Index.

### Is GPT-5.3 Codex or Olmo 3.1 32b Instruct better for coding?

GPT-5.3 Codex scores higher on coding benchmarks: 48.5 versus 38.9 in the Noometry coding category.

### How many benchmarks do GPT-5.3 Codex and Olmo 3.1 32b Instruct share?

0 benchmarks have published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Olmo 3.1 32b Instruct has 16.