# GPT-5.3 Codex vs Granite 3.1 8b Instruct

> GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 31.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-3-codex-vs-granite-3-1-8b-instruct
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in agentic & tool use, where GPT-5.3 Codex leads 47.8 to 23.9.
- Granite 3.1 8b Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.3 Codex | Granite 3.1 8b Instruct |
|---|---|---|
| Provider | OpenAI | IBM |
| Noometry Index | 45.5 | 31.8 |
| Rank | 61 | 256 |
| Context | 400K | — |
| Input $/M | $1.75 | — |
| Output $/M | $14 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.3 Codex: 48.5 (#51)
- Granite 3.1 8b Instruct: 33.9 (#232)

| Benchmark | GPT-5.3 Codex | Granite 3.1 8b Instruct |
|---|---|---|
| SWE-bench Verified | 74.8% | — |
| LMArena WebDev | 1408 | — |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1186 |
| ALE-Bench | 1,655 | — |

## Agentic & Tool Use

- GPT-5.3 Codex: 47.8 (#9)
- Granite 3.1 8b Instruct: 23.9 (#113)

| Benchmark | GPT-5.3 Codex | Granite 3.1 8b Instruct |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| Berkeley Function Calling Leaderboard | — | 27.1% |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |

## Reasoning

- GPT-5.3 Codex: —
- Granite 3.1 8b Instruct: 21.2 (#204)

| Benchmark | GPT-5.3 Codex | Granite 3.1 8b Instruct |
|---|---|---|
| LMArena Hard Prompts | — | 1146 |
| Epoch Capabilities Index | 156.84 | — |

## Math

- GPT-5.3 Codex: —
- Granite 3.1 8b Instruct: 30.4 (#210)

| Benchmark | GPT-5.3 Codex | Granite 3.1 8b Instruct |
|---|---|---|
| LMArena Math | — | 1152 |

## Knowledge

- GPT-5.3 Codex: —
- Granite 3.1 8b Instruct: 30.6 (#218)

| Benchmark | GPT-5.3 Codex | Granite 3.1 8b Instruct |
|---|---|---|
| LMArena Expert | — | 1142 |

## Multilingual

- GPT-5.3 Codex: —
- Granite 3.1 8b Instruct: 31.1 (#255)

| Benchmark | GPT-5.3 Codex | Granite 3.1 8b Instruct |
|---|---|---|
| LMArena Non-English | — | 1099 |
| LMArena Chinese | — | 1145 |
| LMArena Russian | — | 1092 |

## Instruction Following

- GPT-5.3 Codex: —
- Granite 3.1 8b Instruct: 58.9 (#254)

| Benchmark | GPT-5.3 Codex | Granite 3.1 8b Instruct |
|---|---|---|
| LMArena Instruction Following | — | 1131 |

## Long Context

- GPT-5.3 Codex: —
- Granite 3.1 8b Instruct: 35.2 (#236)

| Benchmark | GPT-5.3 Codex | Granite 3.1 8b Instruct |
|---|---|---|
| LMArena Longer Query | — | 1162 |

## Writing & Preference

- GPT-5.3 Codex: —
- Granite 3.1 8b Instruct: 35.7 (#261)

| Benchmark | GPT-5.3 Codex | Granite 3.1 8b Instruct |
|---|---|---|
| LMArena Text | — | 1150 |
| LMArena Creative Writing | — | 1129 |
| LMArena Multi-Turn | — | 1108 |

## FAQ

### Is GPT-5.3 Codex better than Granite 3.1 8b Instruct?

GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 31.8 on the Noometry Index.

### Is GPT-5.3 Codex or Granite 3.1 8b Instruct better for coding?

GPT-5.3 Codex scores higher on coding benchmarks: 48.5 versus 33.9 in the Noometry coding category.

### How many benchmarks do GPT-5.3 Codex and Granite 3.1 8b Instruct share?

0 benchmarks have published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Granite 3.1 8b Instruct has 13.