Is StepFun 3.5 Flash or GPT 5.5 Pro cheaper?

StepFun 3.5 Flash is cheaper on output tokens ($0.30 vs $180.00 per 1M).

Which has the larger context window, StepFun 3.5 Flash or GPT 5.5 Pro?

GPT 5.5 Pro has the larger context window (1M tokens).

StepFun 3.5 Flash vs GPT 5.5 Pro

StepFun 3.5 Flash is cheaper on output tokens, while GPT 5.5 Pro offers a larger context window. Choose StepFun 3.5 Flash or GPT 5.5 Pro based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	StepFun 3.5 Flash	GPT 5.5 Pro
Provider	Vercel AI Gateway	Vercel AI Gateway
Input / 1M tokens	$0.09	$30.00
Output / 1M tokens	$0.30	$180.00
Context window	262K	1M
Parameters	—	—
Open weights	No	No
Released	Jan 2026	Apr 2026

StepFun 3.5 Flash details →GPT 5.5 Pro details →

FAQ

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