# GPT-5-Codex vs Mistral 7B

> GPT-5-Codex is the stronger model overall, scoring 37.9 to 23.0 on the Noometry Index. Mistral 7B costs 14× less per token, which makes it the better buy when GPT-5-Codex's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-codex-vs-mistral-7b
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where GPT-5-Codex leads 30.9 to 13.1.
- Mistral 7B is cheaper at $0.25 / $0.25 per million input/output tokens, against $1.25 / $10 for GPT-5-Codex.
- GPT-5-Codex accepts more context: 400K tokens versus 8K.
- Mistral 7B has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5-Codex | Mistral 7B |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 37.9 | 23.0 |
| Rank | 192 | 351 |
| Context | 400K | 8K |
| Input $/M | $1.25 | $0.25 |
| Output $/M | $10 | $0.25 |
| Weights | Proprietary | Open |

## Coding

- GPT-5-Codex: 42.4 (#103)
- Mistral 7B: 26.4 (#326)

| Benchmark | GPT-5-Codex | Mistral 7B |
|---|---|---|
| WeirdML | 54.5% | — |
| BigCodeBench Instruct | — | 19.5% |
| LMArena Coding | — | 1082 |
| BigCodeBench Complete | — | 27.3% |
| HumanEval+ | — | 36% |
| MBPP+ | — | 42.1% |

## Agentic & Tool Use

- GPT-5-Codex: 31.0 (#72)
- Mistral 7B: —

| Benchmark | GPT-5-Codex | Mistral 7B |
|---|---|---|
| Terminal-Bench | 44.3% | — |

## Reasoning

- GPT-5-Codex: 30.9 (#83)
- Mistral 7B: 13.1 (#336)

| Benchmark | GPT-5-Codex | Mistral 7B |
|---|---|---|
| Kagi LLM Benchmark | 70.3% | — |
| Chess Puzzles | — | 0% |
| LMArena Hard Prompts | — | 1067 |
| DTBench | — | 42.5% |
| Adversarial NLI | — | 47.1% |
| BIG-Bench Hard | — | 56.1% |
| Epoch Capabilities Index | — | 112.21 |
| HellaSwag | — | 81% |
| PIQA | — | 83% |
| WinoGrande | — | 75.3% |

## Math

- GPT-5-Codex: —
- Mistral 7B: 8.1 (#325)

| Benchmark | GPT-5-Codex | Mistral 7B |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 0.3% |
| LMArena Math | — | 1085 |
| MATH Level 5 | — | 3.7% |
| GSM8K | — | 54.4% |

## Knowledge

- GPT-5-Codex: —
- Mistral 7B: 7.4 (#311)

| Benchmark | GPT-5-Codex | Mistral 7B |
|---|---|---|
| GPQA Diamond | — | 15.2% |
| LMArena Expert | — | 1036 |
| ARC (AI2) Challenge | — | 78.6% |
| BoolQ | — | 87.4% |
| MMLU | — | 62.5% |
| OpenBookQA | — | 79.8% |
| TriviaQA | — | 75.2% |

## Multilingual

- GPT-5-Codex: —
- Mistral 7B: 25.8 (#283)

| Benchmark | GPT-5-Codex | Mistral 7B |
|---|---|---|
| LMArena Non-English | — | 1012 |
| LMArena Chinese | — | 1009 |
| LMArena French | — | 1037 |
| LMArena German | — | 987 |
| LMArena Japanese | — | 878 |
| LMArena Russian | — | 1018 |
| LMArena Spanish | — | 1026 |

## Instruction Following

- GPT-5-Codex: —
- Mistral 7B: 54.2 (#280)

| Benchmark | GPT-5-Codex | Mistral 7B |
|---|---|---|
| LMArena Instruction Following | — | 1060 |

## Long Context

- GPT-5-Codex: —
- Mistral 7B: 32.2 (#271)

| Benchmark | GPT-5-Codex | Mistral 7B |
|---|---|---|
| LMArena Longer Query | — | 1060 |

## Writing & Preference

- GPT-5-Codex: —
- Mistral 7B: 30.7 (#286)

| Benchmark | GPT-5-Codex | Mistral 7B |
|---|---|---|
| LMArena Text | — | 1090 |
| LMArena Creative Writing | — | 1068 |
| LMArena Multi-Turn | — | 1062 |

## FAQ

### Is GPT-5-Codex better than Mistral 7B?

GPT-5-Codex is the stronger model overall, scoring 37.9 to 23.0 on the Noometry Index. Mistral 7B costs 14× less per token, which makes it the better buy when GPT-5-Codex's lead doesn't matter for your workload.

### Which is cheaper, GPT-5-Codex or Mistral 7B?

Mistral 7B is cheaper. It lists at $0.25 per million input tokens and $0.25 per million output tokens; GPT-5-Codex lists at $1.25 and $10.

### Is GPT-5-Codex or Mistral 7B better for coding?

GPT-5-Codex scores higher on coding benchmarks: 42.4 versus 26.4 in the Noometry coding category.

### Which has the bigger context window?

GPT-5-Codex does, with 400K tokens against 8K.

### How many benchmarks do GPT-5-Codex and Mistral 7B share?

0 benchmarks have published results for both models. GPT-5-Codex has 3 scored results on Noometry and Mistral 7B has 37.