DeepSeek-V4-Flash vs Step 3.5 Flash
DeepSeek vs StepFun — benchmarks, pricing, and capabilities side by side.
- •DeepSeek-V4-Flash has the higher intelligence index (89.4 vs 83.1)
- •Step 3.5 Flash is cheaper ($0.09 vs $0.10 per 1M input)
- •Step 3.5 Flash is faster
- •DeepSeek-V4-Flash has a larger context window (1M)
| DeepSeek-V4-Flash | Step 3.5 Flash | |
|---|---|---|
| Intelligence index | 89.4 | 83.1 |
| Developer | DeepSeek | StepFun |
| Type | LLM | LLM |
| Access | Open weights | Open weights |
| Context window | 1,048,576 tokens | 262,144 tokens |
| Input price | $0.10 / 1M | $0.09 / 1M |
| Output price | $0.20 / 1M | $0.30 / 1M |
| Speed | 109 tok/s | 194 tok/s |
| Released | April 24, 2026 | January 29, 2026 |
| Parameters | 284B (13B active) | — |
| Input modalities | Text | Text |
| Output modalities | Text | Text |
Shared benchmarks
DeepSeek-V4-Flash
Step 3.5 Flash
GPQA Diamond
89.4
83.1
Humanity’s Last Exam
32.1
19.1