# GPT-5.3 Codex vs Granite 4.2 3b

> GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 39.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-3-codex-vs-granite-4-2-3b
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where GPT-5.3 Codex leads 48.5 to 39.4.
- Granite 4.2 3b has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.3 Codex | Granite 4.2 3b |
|---|---|---|
| Provider | OpenAI | IBM |
| Noometry Index | 45.5 | 39.0 |
| Rank | 61 | 163 |
| Context | 400K | — |
| Input $/M | $1.75 | — |
| Output $/M | $14 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.3 Codex: 48.5 (#51)
- Granite 4.2 3b: 39.4 (#146)

| Benchmark | GPT-5.3 Codex | Granite 4.2 3b |
|---|---|---|
| SWE-bench Verified | 74.8% | — |
| LMArena WebDev | 1408 | — |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1363 |
| ALE-Bench | 1,655 | — |

## Agentic & Tool Use

- GPT-5.3 Codex: 47.8 (#9)
- Granite 4.2 3b: —

| Benchmark | GPT-5.3 Codex | Granite 4.2 3b |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |

## Reasoning

- GPT-5.3 Codex: —
- Granite 4.2 3b: 25.0 (#136)

| Benchmark | GPT-5.3 Codex | Granite 4.2 3b |
|---|---|---|
| LMArena Hard Prompts | — | 1308 |
| Epoch Capabilities Index | 156.84 | — |

## Knowledge

- GPT-5.3 Codex: —
- Granite 4.2 3b: 35.6 (#169)

| Benchmark | GPT-5.3 Codex | Granite 4.2 3b |
|---|---|---|
| LMArena Expert | — | 1313 |

## Multilingual

- GPT-5.3 Codex: —
- Granite 4.2 3b: 42.4 (#193)

| Benchmark | GPT-5.3 Codex | Granite 4.2 3b |
|---|---|---|
| LMArena Non-English | — | 1268 |
| LMArena Chinese | — | 1268 |
| LMArena Russian | — | 1249 |

## Instruction Following

- GPT-5.3 Codex: —
- Granite 4.2 3b: 67.2 (#195)

| Benchmark | GPT-5.3 Codex | Granite 4.2 3b |
|---|---|---|
| LMArena Instruction Following | — | 1271 |

## Long Context

- GPT-5.3 Codex: —
- Granite 4.2 3b: 39.3 (#179)

| Benchmark | GPT-5.3 Codex | Granite 4.2 3b |
|---|---|---|
| LMArena Longer Query | — | 1293 |

## Writing & Preference

- GPT-5.3 Codex: —
- Granite 4.2 3b: 47.9 (#202)

| Benchmark | GPT-5.3 Codex | Granite 4.2 3b |
|---|---|---|
| LMArena Text | — | 1295 |
| LMArena Creative Writing | — | 1215 |
| LMArena Multi-Turn | — | 1293 |

## FAQ

### Is GPT-5.3 Codex better than Granite 4.2 3b?

GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 39.0 on the Noometry Index.

### Is GPT-5.3 Codex or Granite 4.2 3b better for coding?

GPT-5.3 Codex scores higher on coding benchmarks: 48.5 versus 39.4 in the Noometry coding category.

### How many benchmarks do GPT-5.3 Codex and Granite 4.2 3b share?

0 benchmarks have published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Granite 4.2 3b has 11.