# GPT-5 Pro vs Mistral Small 3

> GPT-5 Pro is the stronger model overall, scoring 46.4 to 31.2 on the Noometry Index. Mistral Small 3 costs 717× less per token, which makes it the better buy when GPT-5 Pro's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-pro-vs-mistral-small-3
- Last updated: 2026-10-11
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. GPT-5 Pro scores higher in 4 categories and Mistral Small 3 in 0 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5 Pro leads 48.5 to 16.3.
- Mistral Small 3 is cheaper at $0.05 / $0.08 per million input/output tokens, against $15 / $120 for GPT-5 Pro.
- GPT-5 Pro accepts more context: 400K tokens versus 33K.
- Mistral Small 3 has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5 Pro | Mistral Small 3 |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 46.4 | 31.2 |
| Rank | 64 | 278 |
| Context | 400K | 33K |
| Input $/M | $15 | $0.05 |
| Output $/M | $120 | $0.08 |
| Weights | Proprietary | Open |

## Coding

- GPT-5 Pro: 44.0 (#80)
- Mistral Small 3: 36.5 (#207)

| Benchmark | GPT-5 Pro | Mistral Small 3 |
|---|---|---|
| WeirdML | 60.4% | — |
| BigCodeBench Instruct | — | 45.3% |
| LMArena Coding | — | 1246 |
| BigCodeBench Complete | — | 50.4% |
| AlgoTune | 1.31 | — |

## Reasoning

- GPT-5 Pro: 38.9 (#62)
- Mistral Small 3: 18.9 (#273)

| Benchmark | GPT-5 Pro | Mistral Small 3 |
|---|---|---|
| Epoch Capabilities Index | 150.28 | 127.07 |
| ARC-AGI-2 | 18.3% | — |
| SimpleBench | 61.6% | — |
| Kagi LLM Benchmark | 76.8% | — |
| ARC-AGI-1 | 70.2% | — |
| Chess Puzzles | — | 0% |
| EnigmaEval | 18.8% | — |
| LMArena Hard Prompts | — | 1233 |

## Math

- GPT-5 Pro: 48.5 (#63)
- Mistral Small 3: 16.3 (#295)

| Benchmark | GPT-5 Pro | Mistral Small 3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 55.8% | — |
| FrontierMath Tier 4 | 19.5% | — |
| OTIS Mock AIME 2024-2025 | — | 6.7% |
| LMArena Math | — | 1240 |
| FrontierMath Tier 4 (v1) | 14.6% | — |

## Knowledge

- GPT-5 Pro: 56.7 (#42)
- Mistral Small 3: 25.1 (#263)

| Benchmark | GPT-5 Pro | Mistral Small 3 |
|---|---|---|
| GPQA Diamond | — | 47.3% |
| Humanity's Last Exam | 31.6% | — |
| Confabulations | — | 25.2% |
| LMArena Expert | — | 1202 |

## Multilingual

- GPT-5 Pro: —
- Mistral Small 3: 37.3 (#236)

| Benchmark | GPT-5 Pro | Mistral Small 3 |
|---|---|---|
| LMArena Non-English | — | 1198 |
| LMArena Chinese | — | 1204 |
| LMArena French | — | 1203 |
| LMArena German | — | 1211 |
| LMArena Japanese | — | 1111 |
| LMArena Korean | — | 1188 |
| LMArena Russian | — | 1216 |

## Instruction Following

- GPT-5 Pro: —
- Mistral Small 3: 63.7 (#229)

| Benchmark | GPT-5 Pro | Mistral Small 3 |
|---|---|---|
| LMArena Instruction Following | — | 1214 |

## Long Context

- GPT-5 Pro: —
- Mistral Small 3: 37.8 (#211)

| Benchmark | GPT-5 Pro | Mistral Small 3 |
|---|---|---|
| LMArena Longer Query | — | 1246 |

## Writing & Preference

- GPT-5 Pro: —
- Mistral Small 3: 32.2 (#280)

| Benchmark | GPT-5 Pro | Mistral Small 3 |
|---|---|---|
| LMArena Text | — | 1234 |
| LMArena Creative Writing | — | 1195 |
| EQ-Bench Creative Writing | — | 707 |
| LMArena Multi-Turn | — | 1217 |

## FAQ

### Is GPT-5 Pro better than Mistral Small 3?

GPT-5 Pro is the stronger model overall, scoring 46.4 to 31.2 on the Noometry Index. Mistral Small 3 costs 717× less per token, which makes it the better buy when GPT-5 Pro's lead doesn't matter for your workload.

### Which is cheaper, GPT-5 Pro or Mistral Small 3?

Mistral Small 3 is cheaper. It lists at $0.05 per million input tokens and $0.08 per million output tokens; GPT-5 Pro lists at $15 and $120.

### Is GPT-5 Pro or Mistral Small 3 better for coding?

GPT-5 Pro scores higher on coding benchmarks: 44.0 versus 36.5 in the Noometry coding category.

### Which has the bigger context window?

GPT-5 Pro does, with 400K tokens against 33K.

### How many benchmarks do GPT-5 Pro and Mistral Small 3 share?

1 benchmark has published results for both models. GPT-5 Pro has 12 scored results on Noometry and Mistral Small 3 has 24.