# Claude Sonnet 5.5 vs Mistral Large 3

> Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 38.6 on the Noometry Index. Mistral Large 3 costs 11× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/claude-sonnet-5-5-vs-mistral-large-3
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. Claude Sonnet 5.5 scores higher in 5 categories and Mistral Large 3 in 0 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5.5 leads 88.7 to 36.0.
- Mistral Large 3 is cheaper at $0.25 / $0.75 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
- Claude Sonnet 5.5 accepts more context: 1M tokens versus 262K.
- Mistral Large 3 has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Sonnet 5.5 | Mistral Large 3 |
|---|---|---|
| Provider | Anthropic | Mistral AI |
| Noometry Index | 60.5 | 38.6 |
| Rank | 10 | 172 |
| Context | 1M | 262K |
| Input $/M | $2 | $0.25 |
| Output $/M | $10 | $0.75 |
| Weights | Proprietary | Open |

## Coding

- Claude Sonnet 5.5: 65.5 (#6)
- Mistral Large 3: 34.1 (#230)

| Benchmark | Claude Sonnet 5.5 | Mistral Large 3 |
|---|---|---|
| LMArena WebDev | 1699 | 1230 |
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| LMArena Coding | — | 1447 |
| ALE-Bench | 1,819 | — |

## Agentic & Tool Use

- Claude Sonnet 5.5: 44.9 (#14)
- Mistral Large 3: —

| Benchmark | Claude Sonnet 5.5 | Mistral Large 3 |
|---|---|---|
| APEX-Agents | 75.5% | — |

## Reasoning

- Claude Sonnet 5.5: 52.4 (#29)
- Mistral Large 3: 14.6 (#314)

| Benchmark | Claude Sonnet 5.5 | Mistral Large 3 |
|---|---|---|
| Kagi LLM Benchmark | — | 50.9% |
| NYT Connections (extended) | — | 7.5% |
| CritPt | 31.4% | — |
| Thematic Generalization | — | 23% |
| LMArena Hard Prompts | — | 1429 |
| Mystery Game Puzzles | 65% | — |

## Math

- Claude Sonnet 5.5: 88.7 (#4)
- Mistral Large 3: 36.0 (#131)

| Benchmark | Claude Sonnet 5.5 | Mistral Large 3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| LMArena Math | — | 1415 |

## Knowledge

- Claude Sonnet 5.5: 66.0 (#11)
- Mistral Large 3: 35.5 (#173)

| Benchmark | Claude Sonnet 5.5 | Mistral Large 3 |
|---|---|---|
| GPQA Diamond | 95.6% | — |
| SimpleQA Verified | 46.5% | — |
| Vectara Hallucination Rate | — | 14.5% |
| LMArena Expert | — | 1421 |

## Multimodal

- Claude Sonnet 5.5: 53.2 (#5)
- Mistral Large 3: 37.6 (#65)

| Benchmark | Claude Sonnet 5.5 | Mistral Large 3 |
|---|---|---|
| LMArena Vision | — | 1222 |
| Furniture Assembly | 75% | — |

## Multilingual

- Claude Sonnet 5.5: —
- Mistral Large 3: 52.6 (#79)

| Benchmark | Claude Sonnet 5.5 | Mistral Large 3 |
|---|---|---|
| LMArena Non-English | — | 1412 |
| LMArena Chinese | — | 1448 |
| LMArena French | — | 1456 |
| LMArena German | — | 1438 |
| LMArena Japanese | — | 1399 |
| LMArena Korean | — | 1384 |
| LMArena Russian | — | 1412 |
| LMArena Spanish | — | 1437 |

## Instruction Following

- Claude Sonnet 5.5: —
- Mistral Large 3: 74.1 (#104)

| Benchmark | Claude Sonnet 5.5 | Mistral Large 3 |
|---|---|---|
| LMArena Instruction Following | — | 1402 |

## Long Context

- Claude Sonnet 5.5: —
- Mistral Large 3: 43.1 (#102)

| Benchmark | Claude Sonnet 5.5 | Mistral Large 3 |
|---|---|---|
| LMArena Longer Query | — | 1413 |

## Writing & Preference

- Claude Sonnet 5.5: —
- Mistral Large 3: 60.2 (#100)

| Benchmark | Claude Sonnet 5.5 | Mistral Large 3 |
|---|---|---|
| LMArena Text | — | 1427 |
| LMArena Creative Writing | — | 1385 |
| EQ-Bench Creative Writing | — | 1412 |
| LMArena Multi-Turn | — | 1429 |

## FAQ

### Is Claude Sonnet 5.5 better than Mistral Large 3?

Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 38.6 on the Noometry Index. Mistral Large 3 costs 11× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.

### Which is cheaper, Claude Sonnet 5.5 or Mistral Large 3?

Mistral Large 3 is cheaper. It lists at $0.25 per million input tokens and $0.75 per million output tokens; Claude Sonnet 5.5 lists at $2 and $10.

### Is Claude Sonnet 5.5 or Mistral Large 3 better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 65.5 versus 34.1 in the Noometry coding category.

### Which has the bigger context window?

Claude Sonnet 5.5 does, with 1M tokens against 262K.

### How many benchmarks do Claude Sonnet 5.5 and Mistral Large 3 share?

1 benchmark has published results for both models. Claude Sonnet 5.5 has 16 scored results on Noometry and Mistral Large 3 has 24.