Is Step 3.5 Flash or GPT OSS 120B cheaper?

GPT OSS 120B is cheaper on output tokens ($0.15 vs $0.30 per 1M).

Which has the larger context window, Step 3.5 Flash or GPT OSS 120B?

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

Step 3.5 Flash vs GPT OSS 120B

GPT OSS 120B is cheaper on output tokens, while Step 3.5 Flash offers a larger context window. Choose Step 3.5 Flash or GPT OSS 120B based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Step 3.5 Flash	GPT OSS 120B
Provider	OpenRouter	OpenRouter
Input / 1M tokens	$0.09	$0.03
Output / 1M tokens	$0.30	$0.15
Context window	262K	131K
Parameters	—	117B
Open weights	Yes	Yes
Released	Jan 2026	Aug 2025

Step 3.5 Flash details →GPT OSS 120B details →

FAQ

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