Is Step 3.5 Flash or gpt-oss-20b cheaper?

gpt-oss-20b is cheaper on output tokens ($0.14 vs $0.30 per 1M).

Which has the larger context window, Step 3.5 Flash or gpt-oss-20b?

Step 3.5 Flash has the larger context window (262K tokens).

Step 3.5 Flash vs gpt-oss-20b

gpt-oss-20b is cheaper on output tokens, while Step 3.5 Flash offers a larger context window. Choose Step 3.5 Flash or gpt-oss-20b based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Step 3.5 Flash	gpt-oss-20b
Provider	OpenRouter	OpenRouter
Input / 1M tokens	$0.09	$0.03
Output / 1M tokens	$0.30	$0.14
Context window	262K	131K
Parameters	—	21B
Open weights	Yes	Yes
Released	Jan 2026	Aug 2025

Step 3.5 Flash details →gpt-oss-20b details →

FAQ

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