# GPT-5.1-Codex vs Ministral 3B

> GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 25.6 on the Noometry Index. Ministral 3B costs 86× 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-3b
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where GPT-5.1-Codex leads 29.3 to 24.5.
- Ministral 3B is cheaper at $0.04 / $0.04 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 3B has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.1-Codex | Ministral 3B |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 38.2 | 25.6 |
| Rank | 178 | 336 |
| Context | 400K | 128K |
| Input $/M | $1.25 | $0.04 |
| Output $/M | $10 | $0.04 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.1-Codex: 41.7 (#107)
- Ministral 3B: —

| Benchmark | GPT-5.1-Codex | Ministral 3B |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| ALE-Bench | 1,245 | — |

## Agentic & Tool Use

- GPT-5.1-Codex: 37.8 (#32)
- Ministral 3B: —

| Benchmark | GPT-5.1-Codex | Ministral 3B |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |

## Reasoning

- GPT-5.1-Codex: —
- Ministral 3B: 17.7 (#278)

| Benchmark | GPT-5.1-Codex | Ministral 3B |
|---|---|---|
| DTBench | — | 51.7% |
| LMCA | — | 5.5% |
| Epoch Capabilities Index | — | 118.08 |

## Math

- GPT-5.1-Codex: 29.3 (#218)
- Ministral 3B: 24.5 (#257)

| Benchmark | GPT-5.1-Codex | Ministral 3B |
|---|---|---|
| ProofBench | 9% | — |
| MATH Level 5 | — | 14.4% |

## Knowledge

- GPT-5.1-Codex: —
- Ministral 3B: 10.4 (#297)

| Benchmark | GPT-5.1-Codex | Ministral 3B |
|---|---|---|
| GPQA Diamond | — | 25.3% |
| Vectara Hallucination Rate | — | 7.3% |

## FAQ

### Is GPT-5.1-Codex better than Ministral 3B?

GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 25.6 on the Noometry Index. Ministral 3B costs 86× 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 3B?

Ministral 3B is cheaper. It lists at $0.04 per million input tokens and $0.04 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.

### 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 3B share?

0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Ministral 3B has 6.