Model comparison
Claude Haiku 5.5 vs Longcat Flash Chat
Claude Haiku 5.5 is the stronger model overall, scoring 49.5 to 42.1 on the Noometry Index.
Last verified . 1 shared benchmarks.
Summary
- They share 1 benchmark with published results for both. Claude Haiku 5.5 scores higher in 4 categories and Longcat Flash Chat in 0 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Haiku 5.5 leads 73.6 to 39.4.
- The biggest single-benchmark swing is NYT Connections (extended): 65.7% for Claude Haiku 5.5 and 17.7% for Longcat Flash Chat.
- Longcat Flash Chat has downloadable open weights; the other is API-only.
Side by side
| Claude Haiku 5.5 | Longcat Flash Chat | |
|---|---|---|
| Provider | Anthropic | Meituan |
| Noometry Index | 49.5 | 42.1 |
| Released | 2026-10-07 | — |
| Weights | Proprietary | Open |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $0.10 | — |
| Output $ / M tokens | $0.50 | — |
| Results tracked | 9 | 19 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Claude Haiku 5.5 leads
Claude Haiku 5.5: 49.2 (#50), Longcat Flash Chat: 43.5 (#87)
| Benchmark | Claude Haiku 5.5 | Longcat Flash Chat |
|---|---|---|
| LMArena WebDev | 1587 | — |
| LMArena Coding | — | 1471 |
Reasoning Claude Haiku 5.5 leads
Claude Haiku 5.5: 35.2 (#69), Longcat Flash Chat: 19.0 (#272)
| Benchmark | Claude Haiku 5.5 | Longcat Flash Chat |
|---|---|---|
| NYT Connections (extended) | 65.7% | 17.7% |
| Kagi LLM Benchmark | — | 43.9% |
| LMArena Hard Prompts | — | 1440 |
| Mystery Game Puzzles | 30% | — |
Math Claude Haiku 5.5 leads
Claude Haiku 5.5: 73.6 (#18), Longcat Flash Chat: 39.4 (#107)
| Benchmark | Claude Haiku 5.5 | Longcat Flash Chat |
|---|---|---|
| FrontierMath (Tiers 1-3) | 75.1% | — |
| FrontierMath Tier 4 | 46.3% | — |
| OTIS Mock AIME 2024-2025 | 98.9% | — |
| LMArena Math | — | 1442 |
Knowledge Claude Haiku 5.5 leads
Claude Haiku 5.5: 50.8 (#70), Longcat Flash Chat: 40.6 (#116)
| Benchmark | Claude Haiku 5.5 | Longcat Flash Chat |
|---|---|---|
| GPQA Diamond | 89.6% | — |
| SimpleQA Verified | 23.8% | — |
| LMArena Expert | — | 1454 |
Multimodal Not comparable
Claude Haiku 5.5: 43.7 (#21), Longcat Flash Chat: —
| Benchmark | Claude Haiku 5.5 | Longcat Flash Chat |
|---|---|---|
| Furniture Assembly | 47.5% | — |
Multilingual Not comparable
Claude Haiku 5.5: —, Longcat Flash Chat: 51.9 (#101)
| Benchmark | Claude Haiku 5.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | — | 1404 |
| LMArena Chinese | — | 1465 |
| LMArena French | — | 1456 |
| LMArena German | — | 1408 |
| LMArena Japanese | — | 1373 |
| LMArena Korean | — | 1371 |
| LMArena Russian | — | 1395 |
| LMArena Spanish | — | 1445 |
Instruction Following Not comparable
Claude Haiku 5.5: —, Longcat Flash Chat: 74.4 (#96)
| Benchmark | Claude Haiku 5.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | — | 1411 |
Long Context Not comparable
Claude Haiku 5.5: —, Longcat Flash Chat: 43.5 (#93)
| Benchmark | Claude Haiku 5.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | — | 1425 |
Writing & Preference Not comparable
Claude Haiku 5.5: —, Longcat Flash Chat: 61.0 (#91)
| Benchmark | Claude Haiku 5.5 | Longcat Flash Chat |
|---|---|---|
| LMArena Text | — | 1427 |
| LMArena Creative Writing | — | 1388 |
| LMArena Multi-Turn | — | 1418 |
Frequently asked questions
Is Claude Haiku 5.5 better than Longcat Flash Chat?
Claude Haiku 5.5 is the stronger model overall, scoring 49.5 to 42.1 on the Noometry Index.
Is Claude Haiku 5.5 or Longcat Flash Chat better for coding?
Claude Haiku 5.5 scores higher on coding benchmarks: 49.2 versus 43.5 in the Noometry coding category.
How many benchmarks do Claude Haiku 5.5 and Longcat Flash Chat share?
1 benchmark has published results for both models. Claude Haiku 5.5 has 9 scored results on Noometry and Longcat Flash Chat has 19.