# GPT-5.1-Codex vs Ministral 8B

> GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 27.8 on the Noometry Index. Ministral 8B costs 34× less per token, which makes it the better buy when GPT-5.1-Codex's lead doesn't matter for your workload.

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

## Summary

- The widest gap is in agentic & tool use, where GPT-5.1-Codex leads 37.8 to 16.2.
- Ministral 8B is cheaper at $0.10 / $0.10 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- GPT-5.1-Codex accepts more context: 400K tokens versus 128K.
- Ministral 8B has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.1-Codex | Ministral 8B |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 38.2 | 27.8 |
| Rank | 178 | 321 |
| Context | 400K | 128K |
| Input $/M | $1.25 | $0.10 |
| Output $/M | $10 | $0.10 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.1-Codex: 41.7 (#107)
- Ministral 8B: 34.4 (#226)

| Benchmark | GPT-5.1-Codex | Ministral 8B |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| LMArena Coding | — | 1202 |
| ALE-Bench | 1,245 | — |

## Agentic & Tool Use

- GPT-5.1-Codex: 37.8 (#32)
- Ministral 8B: 16.2 (#140)

| Benchmark | GPT-5.1-Codex | Ministral 8B |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| Berkeley Function Calling Leaderboard | — | 11.1% |
| METR Time Horizons | 70.8% | — |

## Reasoning

- GPT-5.1-Codex: —
- Ministral 8B: 17.7 (#279)

| Benchmark | GPT-5.1-Codex | Ministral 8B |
|---|---|---|
| LMArena Hard Prompts | — | 1191 |
| DTBench | — | 45.7% |

## Math

- GPT-5.1-Codex: 29.3 (#218)
- Ministral 8B: 23.7 (#262)

| Benchmark | GPT-5.1-Codex | Ministral 8B |
|---|---|---|
| ProofBench | 9% | — |
| LMArena Math | — | 1188 |
| MATH Level 5 | — | 14.9% |

## Knowledge

- GPT-5.1-Codex: —
- Ministral 8B: 12.5 (#292)

| Benchmark | GPT-5.1-Codex | Ministral 8B |
|---|---|---|
| GPQA Diamond | — | 27.1% |
| Vectara Hallucination Rate | — | 7.4% |
| LMArena Expert | — | 1170 |

## Multilingual

- GPT-5.1-Codex: —
- Ministral 8B: 35.3 (#242)

| Benchmark | GPT-5.1-Codex | Ministral 8B |
|---|---|---|
| LMArena Non-English | — | 1165 |
| LMArena Chinese | — | 1193 |
| LMArena Russian | — | 1195 |

## Instruction Following

- GPT-5.1-Codex: —
- Ministral 8B: 60.7 (#245)

| Benchmark | GPT-5.1-Codex | Ministral 8B |
|---|---|---|
| LMArena Instruction Following | — | 1161 |

## Long Context

- GPT-5.1-Codex: —
- Ministral 8B: 36.7 (#222)

| Benchmark | GPT-5.1-Codex | Ministral 8B |
|---|---|---|
| LMArena Longer Query | — | 1212 |

## Writing & Preference

- GPT-5.1-Codex: —
- Ministral 8B: 39.8 (#241)

| Benchmark | GPT-5.1-Codex | Ministral 8B |
|---|---|---|
| LMArena Text | — | 1191 |
| LMArena Creative Writing | — | 1175 |
| LMArena Multi-Turn | — | 1166 |

## FAQ

### Is GPT-5.1-Codex better than Ministral 8B?

GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 27.8 on the Noometry Index. Ministral 8B costs 34× less per token, which makes it the better buy when GPT-5.1-Codex's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.1-Codex or Ministral 8B?

Ministral 8B is cheaper. It lists at $0.10 per million input tokens and $0.10 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.

### Is GPT-5.1-Codex or Ministral 8B better for coding?

GPT-5.1-Codex scores higher on coding benchmarks: 41.7 versus 34.4 in the Noometry coding category.

### Which has the bigger context window?

GPT-5.1-Codex does, with 400K tokens against 128K.

### How many benchmarks do GPT-5.1-Codex and Ministral 8B share?

0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Ministral 8B has 17.