# GPT-5-Codex vs Granite 3.1 8b Instruct

> GPT-5-Codex is the stronger model overall, scoring 37.3 to 31.8 on the Noometry Index.

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

## Summary

- The widest gap is in reasoning, where GPT-5-Codex leads 30.0 to 21.2.
- Granite 3.1 8b Instruct has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5-Codex | Granite 3.1 8b Instruct |
|---|---|---|
| Provider | OpenAI | IBM |
| Noometry Index | 37.3 | 31.8 |
| Rank | 190 | 256 |
| Context | 400K | — |
| Input $/M | $1.25 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5-Codex: 41.9 (#100)
- Granite 3.1 8b Instruct: 33.9 (#232)

| Benchmark | GPT-5-Codex | Granite 3.1 8b Instruct |
|---|---|---|
| WeirdML | 54.5% | — |
| LMArena Coding | — | 1186 |

## Agentic & Tool Use

- GPT-5-Codex: 30.8 (#66)
- Granite 3.1 8b Instruct: 23.9 (#113)

| Benchmark | GPT-5-Codex | Granite 3.1 8b Instruct |
|---|---|---|
| Terminal-Bench | 44.3% | — |
| Berkeley Function Calling Leaderboard | — | 27.1% |

## Reasoning

- GPT-5-Codex: 30.0 (#80)
- Granite 3.1 8b Instruct: 21.2 (#204)

| Benchmark | GPT-5-Codex | Granite 3.1 8b Instruct |
|---|---|---|
| Kagi LLM Benchmark | 70.3% | — |
| LMArena Hard Prompts | — | 1146 |

## Math

- GPT-5-Codex: —
- Granite 3.1 8b Instruct: 30.4 (#210)

| Benchmark | GPT-5-Codex | Granite 3.1 8b Instruct |
|---|---|---|
| LMArena Math | — | 1152 |

## Knowledge

- GPT-5-Codex: —
- Granite 3.1 8b Instruct: 30.6 (#218)

| Benchmark | GPT-5-Codex | Granite 3.1 8b Instruct |
|---|---|---|
| LMArena Expert | — | 1142 |

## Multilingual

- GPT-5-Codex: —
- Granite 3.1 8b Instruct: 31.1 (#255)

| Benchmark | GPT-5-Codex | Granite 3.1 8b Instruct |
|---|---|---|
| LMArena Non-English | — | 1099 |
| LMArena Chinese | — | 1145 |
| LMArena Russian | — | 1092 |

## Instruction Following

- GPT-5-Codex: —
- Granite 3.1 8b Instruct: 58.9 (#254)

| Benchmark | GPT-5-Codex | Granite 3.1 8b Instruct |
|---|---|---|
| LMArena Instruction Following | — | 1131 |

## Long Context

- GPT-5-Codex: —
- Granite 3.1 8b Instruct: 35.2 (#236)

| Benchmark | GPT-5-Codex | Granite 3.1 8b Instruct |
|---|---|---|
| LMArena Longer Query | — | 1162 |

## Writing & Preference

- GPT-5-Codex: —
- Granite 3.1 8b Instruct: 35.7 (#261)

| Benchmark | GPT-5-Codex | Granite 3.1 8b Instruct |
|---|---|---|
| LMArena Text | — | 1150 |
| LMArena Creative Writing | — | 1129 |
| LMArena Multi-Turn | — | 1108 |

## FAQ

### Is GPT-5-Codex better than Granite 3.1 8b Instruct?

GPT-5-Codex is the stronger model overall, scoring 37.3 to 31.8 on the Noometry Index.

### Is GPT-5-Codex or Granite 3.1 8b Instruct better for coding?

GPT-5-Codex scores higher on coding benchmarks: 41.9 versus 33.9 in the Noometry coding category.

### How many benchmarks do GPT-5-Codex and Granite 3.1 8b Instruct share?

0 benchmarks have published results for both models. GPT-5-Codex has 3 scored results on Noometry and Granite 3.1 8b Instruct has 13.