LongCat-Flash-Thinking vs Step-3.5-Flash: Specs & Benchmark Comparison
| Characteristic | LongCat-Flash-Thinking | Step-3.5-Flash |
|---|---|---|
| Company | Meituan | StepFun |
| Release Date | September 21, 2025 | 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 | 0.9 | 0.8 |
| Benchmarks | ||
| SWE-Bench Verified | 0.6 | 0.7 |
| AIME 2025 | 0.9 | 1.0 |
Visual Benchmark Comparison
LongCat-Flash-Thinking
Step-3.5-Flash
SWE-Bench Verified0.6 vs 0.7
0.6
0.7
AIME 20250.9 vs 1.0
0.9
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 — 0.9, Step-3.5-Flash — 0.8.
Programming
On SWE-Bench, both models are nearly equal: LongCat-Flash-Thinking — 0.6, Step-3.5-Flash — 0.7.
Recency
Step-3.5-Flash is newer: released 2/1/2026 vs 9/21/2025.
More About These Models
Related Comparisons
The LongCat-Flash-Thinking 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 or Step-3.5-Flash page. See also the complete list of AI model comparisons.