Is stepfun-ai/Step-3.5-Flash or DeepSeek V4 Pro cheaper?

stepfun-ai/Step-3.5-Flash is cheaper on output tokens ($0.30 vs $3.48 per 1M).

Which has the larger context window, stepfun-ai/Step-3.5-Flash or DeepSeek V4 Pro?

DeepSeek V4 Pro has the larger context window (1M tokens).

stepfun-ai/Step-3.5-Flash vs DeepSeek V4 Pro

stepfun-ai/Step-3.5-Flash is cheaper on output tokens, while DeepSeek V4 Pro offers a larger context window. Choose stepfun-ai/Step-3.5-Flash or 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 V4 Pro
Provider	SiliconFlow	SiliconFlow
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

stepfun-ai/Step-3.5-Flash details →DeepSeek V4 Pro details →

FAQ

Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.