# GPT-5.1-Codex vs Granite 4.2 30b

> Granite 4.2 30b is the stronger model overall, scoring 41.4 to 38.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-1-codex-vs-granite-4-2-30b
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- Granite 4.2 30b has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.1-Codex | Granite 4.2 30b |
|---|---|---|
| Provider | OpenAI | IBM |
| Noometry Index | 38.2 | 41.4 |
| Rank | 178 | 126 |
| Context | 400K | — |
| Input $/M | $1.25 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.1-Codex: 41.7 (#107)
- Granite 4.2 30b: 40.4 (#127)

| Benchmark | GPT-5.1-Codex | Granite 4.2 30b |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| LMArena Coding | — | 1394 |
| ALE-Bench | 1,245 | — |

## Agentic & Tool Use

- GPT-5.1-Codex: 37.8 (#32)
- Granite 4.2 30b: —

| Benchmark | GPT-5.1-Codex | Granite 4.2 30b |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |

## Reasoning

- GPT-5.1-Codex: —
- Granite 4.2 30b: 26.7 (#114)

| Benchmark | GPT-5.1-Codex | Granite 4.2 30b |
|---|---|---|
| LMArena Hard Prompts | — | 1375 |

## Math

- GPT-5.1-Codex: 29.3 (#218)
- Granite 4.2 30b: —

| Benchmark | GPT-5.1-Codex | Granite 4.2 30b |
|---|---|---|
| ProofBench | 9% | — |

## Knowledge

- GPT-5.1-Codex: —
- Granite 4.2 30b: 38.5 (#134)

| Benchmark | GPT-5.1-Codex | Granite 4.2 30b |
|---|---|---|
| LMArena Expert | — | 1405 |

## Multilingual

- GPT-5.1-Codex: —
- Granite 4.2 30b: 47.4 (#146)

| Benchmark | GPT-5.1-Codex | Granite 4.2 30b |
|---|---|---|
| LMArena Non-English | — | 1340 |
| LMArena Chinese | — | 1415 |
| LMArena Russian | — | 1342 |

## Instruction Following

- GPT-5.1-Codex: —
- Granite 4.2 30b: 71.3 (#150)

| Benchmark | GPT-5.1-Codex | Granite 4.2 30b |
|---|---|---|
| LMArena Instruction Following | — | 1346 |

## Long Context

- GPT-5.1-Codex: —
- Granite 4.2 30b: 41.4 (#135)

| Benchmark | GPT-5.1-Codex | Granite 4.2 30b |
|---|---|---|
| LMArena Longer Query | — | 1359 |

## Writing & Preference

- GPT-5.1-Codex: —
- Granite 4.2 30b: 54.3 (#147)

| Benchmark | GPT-5.1-Codex | Granite 4.2 30b |
|---|---|---|
| LMArena Text | — | 1363 |
| LMArena Creative Writing | — | 1294 |
| LMArena Multi-Turn | — | 1340 |

## FAQ

### Is GPT-5.1-Codex better than Granite 4.2 30b?

Granite 4.2 30b is the stronger model overall, scoring 41.4 to 38.2 on the Noometry Index.

### Is GPT-5.1-Codex or Granite 4.2 30b better for coding?

GPT-5.1-Codex scores higher on coding benchmarks: 41.7 versus 40.4 in the Noometry coding category.

### How many benchmarks do GPT-5.1-Codex and Granite 4.2 30b share?

0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Granite 4.2 30b has 11.