stepfun-ai/Step-3.5-Flash vs deepseek-ai/DeepSeek-V4-Pro
stepfun-ai/Step-3.5-Flash is cheaper on output tokens, while deepseek-ai/DeepSeek-V4-Pro offers a larger context window. Choose stepfun-ai/Step-3.5-Flash or deepseek-ai/DeepSeek-V4-Pro based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | stepfun-ai/Step-3.5-Flash | deepseek-ai/DeepSeek-V4-Pro |
|---|---|---|
| Provider | SiliconFlow (China) | SiliconFlow (China) |
| Input / 1M tokens | $0.10 | $1.74 |
| Output / 1M tokens | $0.30 | $3.48 |
| Context window | 262K | 1M |
| Parameters | — | 1.6T |
| Open weights | No | Yes |
| Released | Feb 2026 | Apr 2026 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.