Is Step 3.5 Flash 2603 or DeepSeek V4 Pro cheaper?

Step 3.5 Flash 2603 is cheaper on output tokens ($0.30 vs $0.74 per 1M).

Which has the larger context window, Step 3.5 Flash 2603 or DeepSeek V4 Pro?

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

Step 3.5 Flash 2603 vs DeepSeek V4 Pro

Step 3.5 Flash 2603 is cheaper on output tokens, while DeepSeek V4 Pro offers a larger context window. Choose Step 3.5 Flash 2603 or DeepSeek V4 Pro based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Step 3.5 Flash 2603	DeepSeek V4 Pro
Provider	routing.run	routing.run
Input / 1M tokens	$0.10	$0.49
Output / 1M tokens	$0.30	$0.74
Context window	262K	1M
Parameters	—	1.6T
Open weights	Yes	Yes
Released	Apr 2026	Apr 2026

Step 3.5 Flash 2603 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.