Model comparison
Seed 2.0 Pro vs Longcat Flash Chat
Seed 2.0 Pro is the stronger model overall, scoring 42.5 to 41.5 on the Noometry Index.
Last verified . 18 shared benchmarks.
ByteDance SeedSummary
- They share 18 benchmarks with published results for both. Seed 2.0 Pro scores higher in 6 categories and Longcat Flash Chat in 2 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Seed 2.0 Pro leads 23.1 to 18.3.
- The biggest single-benchmark swing is NYT Connections (extended): 28.4% for Seed 2.0 Pro and 17.7% for Longcat Flash Chat.
- Longcat Flash Chat has downloadable open weights; the other is API-only.
Side by side
| Seed 2.0 Pro | Longcat Flash Chat | |
|---|---|---|
| Provider | ByteDance Seed | Meituan |
| Noometry Index | 42.5 | 41.5 |
| Released | 2026-02-14 | — |
| Weights | Proprietary | Open |
| Context window | 256K | — |
| Max output | 128K | — |
| Input $ / M tokens | $0.50 | — |
| Output $ / M tokens | $3 | — |
| Results tracked | 20 | 19 |
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Category by category
Coding Too close to call
Seed 2.0 Pro: 42.9 (#84), Longcat Flash Chat: 42.9 (#85)
| Benchmark | Seed 2.0 Pro | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1472 | 1471 |
Reasoning Seed 2.0 Pro leads
Seed 2.0 Pro: 23.1 (#167), Longcat Flash Chat: 18.3 (#267)
| Benchmark | Seed 2.0 Pro | Longcat Flash Chat |
|---|---|---|
| NYT Connections (extended) | 28.4% | 17.7% |
| LMArena Hard Prompts | 1453 | 1440 |
| Kagi LLM Benchmark | — | 43.9% |
| Thematic Generalization | 57.1% | — |
Math Too close to call
Seed 2.0 Pro: 36.5 (#110), Longcat Flash Chat: 36.6 (#107)
| Benchmark | Seed 2.0 Pro | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1440 | 1441 |
Knowledge Too close to call
Seed 2.0 Pro: 39.6 (#119), Longcat Flash Chat: 40.0 (#111)
| Benchmark | Seed 2.0 Pro | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1440 | 1454 |
Multimodal Not comparable
Seed 2.0 Pro: 40.8 (#34), Longcat Flash Chat: —
| Benchmark | Seed 2.0 Pro | Longcat Flash Chat |
|---|---|---|
| LMArena Vision | 1275 | — |
Multilingual Seed 2.0 Pro leads
Seed 2.0 Pro: 54.8 (#37), Longcat Flash Chat: 52.1 (#95)
| Benchmark | Seed 2.0 Pro | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1442 | 1404 |
| LMArena Chinese | 1490 | 1465 |
| LMArena French | 1470 | 1457 |
| LMArena German | 1443 | 1409 |
| LMArena Japanese | 1408 | 1373 |
| LMArena Korean | 1412 | 1372 |
| LMArena Russian | 1450 | 1396 |
| LMArena Spanish | 1460 | 1445 |
Instruction Following Too close to call
Seed 2.0 Pro: 74.7 (#86), Longcat Flash Chat: 74.6 (#92)
| Benchmark | Seed 2.0 Pro | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1414 | 1411 |
Long Context Too close to call
Seed 2.0 Pro: 43.6 (#85), Longcat Flash Chat: 43.5 (#89)
| Benchmark | Seed 2.0 Pro | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1428 | 1425 |
Writing & Preference Seed 2.0 Pro leads
Seed 2.0 Pro: 63.0 (#66), Longcat Flash Chat: 61.2 (#88)
| Benchmark | Seed 2.0 Pro | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1448 | 1427 |
| LMArena Creative Writing | 1406 | 1388 |
| LMArena Multi-Turn | 1441 | 1418 |
Frequently asked questions
Is Seed 2.0 Pro better than Longcat Flash Chat?
Seed 2.0 Pro is the stronger model overall, scoring 42.5 to 41.5 on the Noometry Index.
Is Seed 2.0 Pro or Longcat Flash Chat better for coding?
They score almost the same on coding (42.9 vs 42.9); test both on your own repository before choosing.
How many benchmarks do Seed 2.0 Pro and Longcat Flash Chat share?
18 benchmarks have published results for both models. Seed 2.0 Pro has 20 scored results on Noometry and Longcat Flash Chat has 19.