# GPT-4.5 vs Mistral Small 3.1

> Side-by-side benchmark comparison for GPT-4.5 and Mistral Small 3.1 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-4-5-vs-mistral-small-3-1
- Last updated: October 14, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick GPT-4.5 if you want the stronger benchmark profile. Mistral Small 3.1 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GPT-4.5 leads overall 69 to 46.
- The biggest single benchmark swing is SimpleQA in Knowledge, with scores of 62.5% and 10.4%.

## Model Snapshot

| Property | GPT-4.5 | Mistral Small 3.1 |
|----------|----------|----------|
| Creator | OpenAI | Mistral |
| Type | Proprietary | Open Weight |
| Reasoning | Non-Reasoning | Non-Reasoning |
| Context | 128K | 128K |
| Overall Score | null | null |
| Benchmarks Covered | 6 | 7 |
| Pricing (input/output) | $75.00 / $150.00 | N/A |

## Category Breakdown

### Coding

- Winner: Not comparable
- GPT-4.5 public-lane score: Coming soon
- Mistral Small 3.1 public-lane score: Coming soon

| Benchmark | GPT-4.5 | Mistral Small 3.1 | Winner |
|-----------|-----------|-----------|--------|
| HumanEval | 88.6% | 88.4% | GPT-4.5 |

### Reasoning

- Winner: Not comparable
- GPT-4.5 public-lane score: Coming soon
- Mistral Small 3.1 public-lane score: Coming soon

| Benchmark | GPT-4.5 | Mistral Small 3.1 | Winner |
|-----------|-----------|-----------|--------|
| DROP | 83.4% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- GPT-4.5 public-lane score: Coming soon
- Mistral Small 3.1 public-lane score: 18.8 (Unranked · 2 rankable rows)

| Benchmark | GPT-4.5 | Mistral Small 3.1 | Winner |
|-----------|-----------|-----------|--------|
| MMMU | Coming soon | 64.0% | Coming soon |
| MMMU-Pro | Coming soon | 49.3% | Coming soon |

### Knowledge

- Winner: Not comparable
- GPT-4.5 public-lane score: Coming soon
- Mistral Small 3.1 public-lane score: Coming soon

| Benchmark | GPT-4.5 | Mistral Small 3.1 | Winner |
|-----------|-----------|-----------|--------|
| MMLU | 90.8% | 80.6% | GPT-4.5 |
| GPQA | 69.5% | 46.0% | GPT-4.5 |
| SimpleQA | 62.5% | 10.4% | GPT-4.5 |
| MMLU-Pro | Coming soon | 66.8% | Coming soon |

### Multilingual

- Winner: Not comparable
- GPT-4.5 public-lane score: Coming soon
- Mistral Small 3.1 public-lane score: Coming soon

| Benchmark | GPT-4.5 | Mistral Small 3.1 | Winner |
|-----------|-----------|-----------|--------|
| MGSM | 86.9% | Coming soon | Coming soon |

## FAQ

### Which is better overall, GPT-4.5 or Mistral Small 3.1?

GPT-4.5 is ahead overall on BenchLM right now.

### How many benchmarks does GPT-4.5 cover on BenchLM?

GPT-4.5 currently has 6 sourced benchmark scores on BenchLM.

### How many benchmarks does Mistral Small 3.1 cover on BenchLM?

Mistral Small 3.1 currently has 7 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GPT-4.5 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gpt-4-5)
- [Mistral Small 3.1 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-mistral-small-3-1)
- [GPT-4.5 vs GPT-6.1 Sol](/compare/gpt-4-5-vs-gpt-6-1-sol)
- [Mistral Small 3.1 vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-mistral-small-3-1)

## Explore More

- [GPT-4.5 profile](/models/gpt-4-5)
- [Mistral Small 3.1 profile](/models/mistral-small-3-1)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)