# Gemini 3.5 Flash vs Mistral Medium 3.5 128B

> Side-by-side benchmark comparison for Gemini 3.5 Flash and Mistral Medium 3.5 128B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-5-flash-vs-mistral-medium-3-5-128b
- Last updated: October 2, 2026

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Gemini 3.5 Flash leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Gemini 3.5 Flash has the higher overall point estimate 63.95 to 36.17. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in agentic, where the averages are 50.7 for Gemini 3.5 Flash and 19.3 for Mistral Medium 3.5 128B.
- The biggest single benchmark swing is GPQA Diamond (Vals) in Knowledge, with scores of 92.7% and 34.8%.
- Mistral Medium 3.5 128B is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Gemini 3.5 Flash also has the larger context window at 1M.

## Model Snapshot

| Property | Gemini 3.5 Flash | Mistral Medium 3.5 128B |
|----------|----------|----------|
| Creator | Google | Mistral |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 256K |
| Overall Score | 63.95 | 36.17 |
| Benchmarks Covered | 27 | 7 |
| Pricing (input/output) | $1.50 / $9.00 | $1.50 / $7.50 |

## Category Breakdown

### Agentic

- Winner: Gemini 3.5 Flash
- Gemini 3.5 Flash public-lane score: 50.7 (Supported · #42/119)
- Mistral Medium 3.5 128B public-lane score: 19.3 (Supported · #99/119)

| Benchmark | Gemini 3.5 Flash | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 76.2% | Coming soon | Coming soon |
| MCP Atlas | 83.6% | Coming soon | Coming soon |
| Toolathlon | 56.5% | Coming soon | Coming soon |
| OSWorld-Verified | 78.4% | Coming soon | Coming soon |
| Finance Agent v2 | 57.9% | Coming soon | Coming soon |
| Gert Labs | 61.85% | 39.10% | Gemini 3.5 Flash |
| ResearchClawBench | 18.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 74.2% | 39.0% | Gemini 3.5 Flash |
| τ³-bench results | Coming soon | 91.4% | Coming soon |

### Coding

- Winner: Directional only
- Gemini 3.5 Flash public-lane score: 52.3 (Supported · #39/144)
- Mistral Medium 3.5 128B public-lane score: 25.3 (Estimated · #105/144)

| Benchmark | Gemini 3.5 Flash | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 76.2% | Coming soon | Coming soon |
| SWE-bench Pro | 55.1% | Coming soon | Coming soon |
| Vibe Code Bench | 48.68% | Coming soon | Coming soon |
| cursorBench31 | 49.8% | Coming soon | Coming soon |
| CursorBench 3.2 | 48.8% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 87.6% | Coming soon | Coming soon |
| SWE-bench (Vals) | 78.8% | 66.4% | Gemini 3.5 Flash |
| SWE-bench Verified | Coming soon | 77.6% | Coming soon |

### Reasoning

- Winner: Not comparable
- Gemini 3.5 Flash public-lane score: 62.8 (#20/27)
- Mistral Medium 3.5 128B public-lane score: 69.9 (Unranked · 2 rankable rows)

| Benchmark | Gemini 3.5 Flash | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| MRCRv2 | 77.3% | Coming soon | Coming soon |
| MRCR 1M | 26.6% | Coming soon | Coming soon |
| ARC-AGI-2 | 72.1% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Gemini 3.5 Flash public-lane score: 87.8 (#6/49)
- Mistral Medium 3.5 128B public-lane score: 56.7 (Unranked · 1 rankable row)

| Benchmark | Gemini 3.5 Flash | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | 84.2% | Coming soon | Coming soon |
| MMMU-Pro | 83.6% | Coming soon | Coming soon |
| Blueprint-Bench 2 | 33.6% | Coming soon | Coming soon |

### Knowledge

- Winner: Gemini 3.5 Flash
- Gemini 3.5 Flash public-lane score: 64 (Supported · #30/171)
- Mistral Medium 3.5 128B public-lane score: 32.9 (Supported · #124/171)

| Benchmark | Gemini 3.5 Flash | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | 92.7% | Coming soon | Coming soon |
| HLE | 40.2% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 92.7% | 34.8% | Gemini 3.5 Flash |
| MMLU-Pro (Vals) | 89.5% | 75.3% | Gemini 3.5 Flash |

### Instruction Following

- Winner: Directional only
- Gemini 3.5 Flash public-lane score: 84.1 (#43/125)
- Mistral Medium 3.5 128B public-lane score: 82.6 (#46/125)

### Mathematics

- Winner: Not comparable
- Gemini 3.5 Flash public-lane score: 55.1 (Unranked · 2 rankable rows)
- Mistral Medium 3.5 128B public-lane score: Coming soon

| Benchmark | Gemini 3.5 Flash | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 38.966% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 14.583% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Gemini 3.5 Flash or Mistral Medium 3.5 128B?

Gemini 3.5 Flash has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Gemini 3.5 Flash and Mistral Medium 3.5 128B?

The widest category gap is in agentic, where the averages are 50.7 for Gemini 3.5 Flash and 19.3 for Mistral Medium 3.5 128B.

### How many benchmarks does Gemini 3.5 Flash cover on BenchLM?

Gemini 3.5 Flash currently has 27 sourced benchmark scores on BenchLM.

### How many benchmarks does Mistral Medium 3.5 128B cover on BenchLM?

Mistral Medium 3.5 128B currently has 7 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Gemini 3.5 Flash vs Gemini 3.5 Flash Cyber](/compare/gemini-3-5-flash-vs-gemini-3-5-flash-cyber)
- [Mistral Medium 3.5 128B vs Gemini 3.5 Flash Cyber](/compare/gemini-3-5-flash-cyber-vs-mistral-medium-3-5-128b)
- [Gemini 3.5 Flash vs GPT-6 Astra](/compare/gemini-3-5-flash-vs-gpt-6-astra)
- [Mistral Medium 3.5 128B vs GPT-6 Astra](/compare/gpt-6-astra-vs-mistral-medium-3-5-128b)

## Explore More

- [Gemini 3.5 Flash profile](/models/gemini-3-5-flash)
- [Mistral Medium 3.5 128B profile](/models/mistral-medium-3-5-128b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)