# GPT-5.3 Codex vs Granite 4.0 H Small

> GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 35.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-3-codex-vs-ibm-granite-h-small
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where GPT-5.3 Codex leads 48.5 to 35.8.
- Granite 4.0 H Small has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.3 Codex | Granite 4.0 H Small |
|---|---|---|
| Provider | OpenAI | IBM |
| Noometry Index | 45.5 | 35.9 |
| Rank | 61 | 213 |
| Context | 400K | — |
| Input $/M | $1.75 | — |
| Output $/M | $14 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.3 Codex: 48.5 (#51)
- Granite 4.0 H Small: 35.8 (#207)

| Benchmark | GPT-5.3 Codex | Granite 4.0 H Small |
|---|---|---|
| SWE-bench Verified | 74.8% | — |
| LMArena WebDev | 1408 | — |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1247 |
| ALE-Bench | 1,655 | — |

## Agentic & Tool Use

- GPT-5.3 Codex: 47.8 (#9)
- Granite 4.0 H Small: —

| Benchmark | GPT-5.3 Codex | Granite 4.0 H Small |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |

## Reasoning

- GPT-5.3 Codex: —
- Granite 4.0 H Small: 23.4 (#164)

| Benchmark | GPT-5.3 Codex | Granite 4.0 H Small |
|---|---|---|
| LMArena Hard Prompts | — | 1240 |
| Epoch Capabilities Index | 156.84 | — |

## Math

- GPT-5.3 Codex: —
- Granite 4.0 H Small: 29.3 (#219)

| Benchmark | GPT-5.3 Codex | Granite 4.0 H Small |
|---|---|---|
| Omni-MATH | — | 29.6% |
| LMArena Math | — | 1251 |

## Knowledge

- GPT-5.3 Codex: —
- Granite 4.0 H Small: 31.5 (#210)

| Benchmark | GPT-5.3 Codex | Granite 4.0 H Small |
|---|---|---|
| MMLU-Pro | — | 56.9% |
| Vectara Hallucination Rate | — | 5.2% |
| GPQA (HELM) | — | 38.3% |
| LMArena Expert | — | 1244 |

## Multilingual

- GPT-5.3 Codex: —
- Granite 4.0 H Small: 38.7 (#223)

| Benchmark | GPT-5.3 Codex | Granite 4.0 H Small |
|---|---|---|
| LMArena Non-English | — | 1216 |
| LMArena Chinese | — | 1250 |
| LMArena Russian | — | 1198 |
| LMArena Spanish | — | 1258 |

## Instruction Following

- GPT-5.3 Codex: —
- Granite 4.0 H Small: 68.9 (#178)

| Benchmark | GPT-5.3 Codex | Granite 4.0 H Small |
|---|---|---|
| IFEval | — | 89% |
| LMArena Instruction Following | — | 1221 |

## Long Context

- GPT-5.3 Codex: —
- Granite 4.0 H Small: 37.6 (#209)

| Benchmark | GPT-5.3 Codex | Granite 4.0 H Small |
|---|---|---|
| LMArena Longer Query | — | 1240 |

## Writing & Preference

- GPT-5.3 Codex: —
- Granite 4.0 H Small: 44.0 (#222)

| Benchmark | GPT-5.3 Codex | Granite 4.0 H Small |
|---|---|---|
| LMArena Text | — | 1241 |
| LMArena Creative Writing | — | 1210 |
| WildBench | — | 73.9% |
| LMArena Multi-Turn | — | 1243 |

## FAQ

### Is GPT-5.3 Codex better than Granite 4.0 H Small?

GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 35.9 on the Noometry Index.

### Is GPT-5.3 Codex or Granite 4.0 H Small better for coding?

GPT-5.3 Codex scores higher on coding benchmarks: 48.5 versus 35.8 in the Noometry coding category.

### How many benchmarks do GPT-5.3 Codex and Granite 4.0 H Small share?

0 benchmarks have published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Granite 4.0 H Small has 19.