# Laguna XS 2.1 vs Mistral Medium 3.5 128B

> Side-by-side benchmark comparison for Laguna XS 2.1 and Mistral Medium 3.5 128B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/laguna-xs-2-1-vs-mistral-medium-3-5-128b
- Last updated: September 10, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: Laguna XS 2.1 and Mistral Medium 3.5 128B share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Laguna XS 2.1 has the lower published output-token price.
- Laguna XS 2.1 has the larger published context window at 262K.

## Model Snapshot

| Property | Laguna XS 2.1 | Mistral Medium 3.5 128B |
|----------|----------|----------|
| Creator | Poolside | Mistral |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 262K | 256K |
| Independent public score (not head-to-head) | null | 30.13 |
| Benchmarks Covered | 5 | 7 |
| Pricing (input/output) | $0.10 / $0.20 | $1.50 / $7.50 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Laguna XS 2.1 public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 21.9 (Supported · #150/152)

| Benchmark | Laguna XS 2.1 | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 37.5% | Coming soon | Coming soon |
| τ³-bench results | Coming soon | 91.4% | Coming soon |
| Gert Labs | Coming soon | 39.10% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 39.0% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Laguna XS 2.1 public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 36.9 (Estimated · #127/151)

| Benchmark | Laguna XS 2.1 | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 70.9% | 77.6% | Mistral Medium 3.5 128B |
| SWE Multilingual | 63.1% | Coming soon | Coming soon |
| SWE-bench Pro | 47.6% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 37.5% | Coming soon | Coming soon |
| SWE-bench (Vals) | Coming soon | 66.4% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Laguna XS 2.1 public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 55.6 (Unranked · 1 rankable row)

### Reasoning

- Winner: Insufficient shared evidence
- Laguna XS 2.1 public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 68.6 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Insufficient shared evidence
- Laguna XS 2.1 public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 39 (Supported · #140/183)

| Benchmark | Laguna XS 2.1 | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | Coming soon | 34.8% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 75.3% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Laguna XS 2.1 public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 84 (#48/123)

## FAQ

### Is there enough evidence to pick between Laguna XS 2.1 and Mistral Medium 3.5 128B?

Not yet. The models share only 1 sourced benchmark row, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Laguna XS 2.1 vs Laguna M.1](/compare/laguna-m-1-vs-laguna-xs-2-1)
- [Mistral Medium 3.5 128B vs Laguna M.1](/compare/laguna-m-1-vs-mistral-medium-3-5-128b)
- [Laguna XS 2.1 vs Laguna XS.2](/compare/laguna-xs-2-vs-laguna-xs-2-1)
- [Mistral Medium 3.5 128B vs Laguna XS.2](/compare/laguna-xs-2-vs-mistral-medium-3-5-128b)

## Explore More

- [Laguna XS 2.1 profile](/models/laguna-xs-2-1)
- [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)