LongCat-Flash-Thinking-2601 vs Step-3.5-Flash: Specs & Benchmark Comparison
| Characteristic | LongCat-Flash-Thinking-2601 | Step-3.5-Flash |
|---|---|---|
| Company | Meituan | StepFun |
| Release Date | January 13, 2026 | February 1, 2026 |
| Parameters | 560B | 196B |
| Multimodal | No | Yes |
| Context (input) | — | 66K |
| Context (output) | — | 8K |
| Input Price / 1M | — | $0.10 |
| Output Price / 1M | — | $0.40 |
| Average Score | 0.8 | 0.8 |
| Benchmarks | ||
| BrowseComp | 0.6 | 0.7 |
| SWE-Bench Verified | 0.6 | 0.7 |
| IMO-AnswerBench | 0.8 | 0.8 |
| AIME 2025 | 1.0 | 1.0 |
Visual Benchmark Comparison
LongCat-Flash-Thinking-2601
Step-3.5-Flash
BrowseComp0.6 vs 0.7
0.6
0.7
SWE-Bench Verified0.6 vs 0.7
0.6
0.7
IMO-AnswerBench0.8 vs 0.8
0.8
0.8
AIME 20251.0 vs 1.0
1.0
1.0
Verdict
Step-3.5-Flash leads in 1 out of 3 comparison categories.
Overall Performance
Both models show comparable average scores: LongCat-Flash-Thinking-2601 — 0.8, Step-3.5-Flash — 0.8.
Programming
On SWE-Bench, both models are nearly equal: LongCat-Flash-Thinking-2601 — 0.6, Step-3.5-Flash — 0.7.
Recency
Step-3.5-Flash is newer: released 2/1/2026 vs 1/13/2026.
More About These Models
Related Comparisons
The LongCat-Flash-Thinking-2601 and Step-3.5-Flash comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the LongCat-Flash-Thinking-2601 or Step-3.5-Flash page. See also the complete list of AI model comparisons.