# GPT-5.3 Codex vs Olmo 7b Instruct

> GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 30.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-3-codex-vs-olmo-7b-instruct
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where GPT-5.3 Codex leads 48.6 to 29.6.
- Olmo 7b Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.3 Codex | Olmo 7b Instruct |
|---|---|---|
| Provider | OpenAI | Allen Institute for AI (Ai2) |
| Noometry Index | 45.8 | 30.3 |
| Rank | 69 | 295 |
| Context | 400K | — |
| Input $/M | $1.75 | — |
| Output $/M | $14 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.3 Codex: 48.6 (#56)
- Olmo 7b Instruct: 29.6 (#303)

| Benchmark | GPT-5.3 Codex | Olmo 7b Instruct |
|---|---|---|
| SWE-bench Verified | 74.8% | — |
| LMArena WebDev | 1409 | — |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1016 |
| ALE-Bench | 1,655 | — |

## Agentic & Tool Use

- GPT-5.3 Codex: 48.0 (#9)
- Olmo 7b Instruct: —

| Benchmark | GPT-5.3 Codex | Olmo 7b Instruct |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |

## Reasoning

- GPT-5.3 Codex: —
- Olmo 7b Instruct: 18.8 (#274)

| Benchmark | GPT-5.3 Codex | Olmo 7b Instruct |
|---|---|---|
| LMArena Hard Prompts | — | 993 |
| Epoch Capabilities Index | 156.77 | — |

## Math

- GPT-5.3 Codex: —
- Olmo 7b Instruct: 30.2 (#237)

| Benchmark | GPT-5.3 Codex | Olmo 7b Instruct |
|---|---|---|
| LMArena Math | — | 1018 |

## Multilingual

- GPT-5.3 Codex: —
- Olmo 7b Instruct: 24.0 (#291)

| Benchmark | GPT-5.3 Codex | Olmo 7b Instruct |
|---|---|---|
| LMArena Non-English | — | 977 |
| LMArena Chinese | — | 1014 |
| LMArena Russian | — | 947 |

## Instruction Following

- GPT-5.3 Codex: —
- Olmo 7b Instruct: 49.0 (#301)

| Benchmark | GPT-5.3 Codex | Olmo 7b Instruct |
|---|---|---|
| LMArena Instruction Following | — | 978 |

## Writing & Preference

- GPT-5.3 Codex: —
- Olmo 7b Instruct: 25.8 (#303)

| Benchmark | GPT-5.3 Codex | Olmo 7b Instruct |
|---|---|---|
| LMArena Text | — | 1032 |
| LMArena Creative Writing | — | 990 |
| LMArena Multi-Turn | — | 1007 |

## FAQ

### Is GPT-5.3 Codex better than Olmo 7b Instruct?

GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 30.3 on the Noometry Index.

### Is GPT-5.3 Codex or Olmo 7b Instruct better for coding?

GPT-5.3 Codex scores higher on coding benchmarks: 48.6 versus 29.6 in the Noometry coding category.

### How many benchmarks do GPT-5.3 Codex and Olmo 7b Instruct share?

0 benchmarks have published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Olmo 7b Instruct has 10.