# Composer 2.5 vs Mistral Medium 3.5 128B

> Side-by-side benchmark comparison for Composer 2.5 and Mistral Medium 3.5 128B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

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

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Composer 2.5 and Mistral Medium 3.5 128B share only 2 sourced benchmark rows.

## Summary

- Only 2 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Composer 2.5 has the lower published output-token price.
- Mistral Medium 3.5 128B has the larger published context window at 256K.

## Model Snapshot

| Property | Composer 2.5 | Mistral Medium 3.5 128B |
|----------|----------|----------|
| Creator | Cursor | Mistral |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 200K | 256K |
| Independent public score (not head-to-head) | null | 36.17 |
| Benchmarks Covered | 8 | 7 |
| Pricing (input/output) | $0.50 / $2.50 | $1.50 / $7.50 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Composer 2.5 public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 19.3 (Supported · #99/119)

| Benchmark | Composer 2.5 | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 69.3% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 58.4% | 39.0% | Composer 2.5 |
| τ³-bench results | Coming soon | 91.4% | Coming soon |
| Gert Labs | Coming soon | 39.10% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Composer 2.5 public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 25.3 (Estimated · #105/144)

| Benchmark | Composer 2.5 | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 69.3% | Coming soon | Coming soon |
| SWE Multilingual | 79.8% | Coming soon | Coming soon |
| cursorBench31 | 63.2% | Coming soon | Coming soon |
| CursorBench 3.2 | 56.1% | Coming soon | Coming soon |
| SWE-bench (Vals) | 79.6% | 66.4% | Composer 2.5 |
| CursorBench 4.0 | 27.7% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 77.6% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Composer 2.5 public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 69.9 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Composer 2.5 public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 56.7 (Unranked · 1 rankable row)

### Knowledge

- Winner: Insufficient shared evidence
- Composer 2.5 public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 32.9 (Supported · #124/171)

| Benchmark | Composer 2.5 | 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
- Composer 2.5 public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 82.6 (#46/125)

## FAQ

### Is there enough evidence to pick between Composer 2.5 and Mistral Medium 3.5 128B?

Not yet. The models share only 2 sourced benchmark rows, 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

- [Composer 2.5 vs Composer 2](/compare/composer-2-vs-composer-2-5)
- [Mistral Medium 3.5 128B vs Composer 2](/compare/composer-2-vs-mistral-medium-3-5-128b)
- [Composer 2.5 vs Composer 2 Fast](/compare/composer-2-5-vs-composer-2-fast)
- [Mistral Medium 3.5 128B vs Composer 2 Fast](/compare/composer-2-fast-vs-mistral-medium-3-5-128b)

## Explore More

- [Composer 2.5 profile](/models/composer-2-5)
- [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)