# Claude Haiku 4.5 vs Mistral Medium 3.5 128B

> Side-by-side benchmark comparison for Claude Haiku 4.5 and Mistral Medium 3.5 128B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-haiku-4-5-vs-mistral-medium-3-5-128b
- Last updated: September 10, 2026

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

## Quick Verdict

Pick Claude Haiku 4.5 if you want the stronger benchmark profile. Mistral Medium 3.5 128B only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Claude Haiku 4.5 leads overall 52.79 to 30.13.
- The clearest category separation is in coding, where the averages are 27.2 for Claude Haiku 4.5 and 36.9 for Mistral Medium 3.5 128B.
- The biggest single benchmark swing is GPQA Diamond (Vals) in Knowledge, with scores of 72.2% and 34.8%.
- Claude Haiku 4.5 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Mistral Medium 3.5 128B also has the larger context window at 256K.

## Model Snapshot

| Property | Claude Haiku 4.5 | Mistral Medium 3.5 128B |
|----------|----------|----------|
| Creator | Anthropic | Mistral |
| Type | Proprietary | Open Weight |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 256K |
| Overall Score | 52.79 | 30.13 |
| Benchmarks Covered | 10 | 7 |
| Pricing (input/output) | $1.00 / $5.00 | $1.50 / $7.50 |

## Category Breakdown

### Agentic

- Winner: Claude Haiku 4.5
- Claude Haiku 4.5 public-lane score: 27 (Supported · #142/152)
- Mistral Medium 3.5 128B public-lane score: 21.9 (Supported · #150/152)

| Benchmark | Claude Haiku 4.5 | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| JobBench | 16.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 43.8% | 39.0% | Claude Haiku 4.5 |
| τ³-bench results | Coming soon | 91.4% | Coming soon |
| Gert Labs | Coming soon | 39.10% | Coming soon |

### Coding

- Winner: Coming soon
- Claude Haiku 4.5 public-lane score: 27.2 (Supported · #144/151)
- Mistral Medium 3.5 128B public-lane score: 36.9 (Estimated · #127/151)

| Benchmark | Claude Haiku 4.5 | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 73.3% | 77.6% | Mistral Medium 3.5 128B |
| VulcanBench v3 | 76.2% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 41.2% | Coming soon | Coming soon |
| SWE-bench (Vals) | 66.6% | 66.4% | Claude Haiku 4.5 |

### Multimodal & Grounded

- Winner: Coming soon
- Claude Haiku 4.5 public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 55.6 (Unranked · 1 rankable row)

### Reasoning

- Winner: Coming soon
- Claude Haiku 4.5 public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 68.6 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Coming soon
- Claude Haiku 4.5 public-lane score: 44.2 (Estimated · #115/183)
- Mistral Medium 3.5 128B public-lane score: 39 (Supported · #140/183)

| Benchmark | Claude Haiku 4.5 | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 72.2% | 34.8% | Claude Haiku 4.5 |
| MMLU-Pro (Vals) | 78.7% | 75.3% | Claude Haiku 4.5 |

### Instruction Following

- Winner: Coming soon
- Claude Haiku 4.5 public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 84 (#48/123)

### Mathematics

- Winner: Coming soon
- Claude Haiku 4.5 public-lane score: 28.9 (Unranked · 2 rankable rows)
- Mistral Medium 3.5 128B public-lane score: Coming soon

| Benchmark | Claude Haiku 4.5 | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 5.903% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 2.083% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Claude Haiku 4.5 or Mistral Medium 3.5 128B?

Claude Haiku 4.5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Haiku 4.5 and Mistral Medium 3.5 128B?

The widest category gap is in coding, where the averages are 27.2 for Claude Haiku 4.5 and 36.9 for Mistral Medium 3.5 128B.

### How many benchmarks does Claude Haiku 4.5 cover on BenchLM?

Claude Haiku 4.5 currently has 10 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

- [Claude Haiku 4.5 vs Claude Haiku 4.5 Thinking](/compare/claude-haiku-4-5-vs-claude-haiku-4-5-thinking)
- [Mistral Medium 3.5 128B vs Claude Haiku 4.5 Thinking](/compare/claude-haiku-4-5-thinking-vs-mistral-medium-3-5-128b)
- [Claude Haiku 4.5 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-claude-haiku-4-5)
- [Mistral Medium 3.5 128B vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-mistral-medium-3-5-128b)

## Explore More

- [Claude Haiku 4.5 profile](/models/claude-haiku-4-5)
- [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)