Model comparison
Claude Haiku 5.5 vs Mistral Small 3.1
Claude Haiku 5.5 is the stronger model overall, scoring 49.5 to 31.7 on the Noometry Index.
Last verified . 2 shared benchmarks.
Mistral AISummary
- They share 2 benchmarks with published results for both. Claude Haiku 5.5 scores higher in 5 categories and Mistral Small 3.1 in 0 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Haiku 5.5 leads 73.6 to 14.7.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 98.9% for Claude Haiku 5.5 and 3.9% for Mistral Small 3.1.
- Claude Haiku 5.5 is cheaper at $0.10 / $0.50 per million input/output tokens, against $0.35 / $0.56 for Mistral Small 3.1.
- Claude Haiku 5.5 accepts more context: 1M tokens versus 128K.
- Mistral Small 3.1 has downloadable open weights; the other is API-only.
Side by side
| Claude Haiku 5.5 | Mistral Small 3.1 | |
|---|---|---|
| Provider | Anthropic | Mistral AI |
| Noometry Index | 49.5 | 31.7 |
| Released | 2026-10-07 | 2025-03-17 |
| Weights | Proprietary | Open |
| Context window | 1M | 128K |
| Max output | 128K | 102K |
| Input $ / M tokens | $0.10 | $0.35 |
| Output $ / M tokens | $0.50 | $0.56 |
| Results tracked | 9 | 28 |
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Category by category
Coding Claude Haiku 5.5 leads
Claude Haiku 5.5: 49.2 (#50), Mistral Small 3.1: 38.3 (#179)
| Benchmark | Claude Haiku 5.5 | Mistral Small 3.1 |
|---|---|---|
| LMArena WebDev | 1587 | — |
| LMArena Coding | — | 1309 |
Reasoning Claude Haiku 5.5 leads
Claude Haiku 5.5: 35.2 (#69), Mistral Small 3.1: 19.7 (#254)
| Benchmark | Claude Haiku 5.5 | Mistral Small 3.1 |
|---|---|---|
| NYT Connections (extended) | 65.7% | — |
| Chess Puzzles | — | 1% |
| LMArena Hard Prompts | — | 1278 |
| Mystery Game Puzzles | 30% | — |
| Epoch Capabilities Index | — | 127.48 |
Math Claude Haiku 5.5 leads
Claude Haiku 5.5: 73.6 (#18), Mistral Small 3.1: 14.7 (#301)
| Benchmark | Claude Haiku 5.5 | Mistral Small 3.1 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 98.9% | 3.9% |
| FrontierMath (Tiers 1-3) | 75.1% | — |
| FrontierMath Tier 4 | 46.3% | — |
| Omni-MATH | — | 24.8% |
| LMArena Math | — | 1262 |
Knowledge Claude Haiku 5.5 leads
Claude Haiku 5.5: 50.8 (#70), Mistral Small 3.1: 22.6 (#271)
| Benchmark | Claude Haiku 5.5 | Mistral Small 3.1 |
|---|---|---|
| GPQA Diamond | 89.6% | 41.9% |
| SimpleQA Verified | 23.8% | — |
| MMLU-Pro | — | 61% |
| GPQA (HELM) | — | 39.2% |
| LMArena Expert | — | 1257 |
Multimodal Claude Haiku 5.5 leads
Claude Haiku 5.5: 43.7 (#21), Mistral Small 3.1: 33.2 (#99)
| Benchmark | Claude Haiku 5.5 | Mistral Small 3.1 |
|---|---|---|
| LMArena Vision | — | 1136 |
| Furniture Assembly | 47.5% | — |
Multilingual Not comparable
Claude Haiku 5.5: —, Mistral Small 3.1: 41.2 (#209)
| Benchmark | Claude Haiku 5.5 | Mistral Small 3.1 |
|---|---|---|
| LMArena Non-English | — | 1255 |
| LMArena Chinese | — | 1253 |
| LMArena French | — | 1273 |
| LMArena German | — | 1266 |
| LMArena Japanese | — | 1208 |
| LMArena Korean | — | 1206 |
| LMArena Russian | — | 1263 |
| LMArena Spanish | — | 1283 |
Instruction Following Not comparable
Claude Haiku 5.5: —, Mistral Small 3.1: 63.6 (#230)
| Benchmark | Claude Haiku 5.5 | Mistral Small 3.1 |
|---|---|---|
| IFEval | — | 75% |
| LMArena Instruction Following | — | 1264 |
Long Context Not comparable
Claude Haiku 5.5: —, Mistral Small 3.1: 39.5 (#178)
| Benchmark | Claude Haiku 5.5 | Mistral Small 3.1 |
|---|---|---|
| LMArena Longer Query | — | 1299 |
Writing & Preference Not comparable
Claude Haiku 5.5: —, Mistral Small 3.1: 37.0 (#259)
| Benchmark | Claude Haiku 5.5 | Mistral Small 3.1 |
|---|---|---|
| LMArena Text | — | 1277 |
| LMArena Creative Writing | — | 1253 |
| EQ-Bench Creative Writing | — | 761 |
| WildBench | — | 78.8% |
| LMArena Multi-Turn | — | 1270 |
Frequently asked questions
Is Claude Haiku 5.5 better than Mistral Small 3.1?
Claude Haiku 5.5 is the stronger model overall, scoring 49.5 to 31.7 on the Noometry Index.
Which is cheaper, Claude Haiku 5.5 or Mistral Small 3.1?
Claude Haiku 5.5 is cheaper. It lists at $0.10 per million input tokens and $0.50 per million output tokens; Mistral Small 3.1 lists at $0.35 and $0.56.
Is Claude Haiku 5.5 or Mistral Small 3.1 better for coding?
Claude Haiku 5.5 scores higher on coding benchmarks: 49.2 versus 38.3 in the Noometry coding category.
Which has the bigger context window?
Claude Haiku 5.5 does, with 1M tokens against 128K.
How many benchmarks do Claude Haiku 5.5 and Mistral Small 3.1 share?
2 benchmarks have published results for both models. Claude Haiku 5.5 has 9 scored results on Noometry and Mistral Small 3.1 has 28.