Is GPT OSS 20B or Claude Opus 4.1 cheaper?

GPT OSS 20B is cheaper on output tokens ($0.20 vs $75.00 per 1M).

Which has the larger context window, GPT OSS 20B or Claude Opus 4.1?

Claude Opus 4.1 has the larger context window (200K tokens).

GPT OSS 20B vs Claude Opus 4.1

GPT OSS 20B is cheaper on output tokens, while Claude Opus 4.1 offers a larger context window. Choose GPT OSS 20B or Claude Opus 4.1 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT OSS 20B	Claude Opus 4.1
Provider	FastRouter	FastRouter
Input / 1M tokens	$0.05	$15.00
Output / 1M tokens	$0.20	$75.00
Context window	131K	200K
Parameters	21B	—
Open weights	Yes	No
Released	Aug 2025	Aug 2025

GPT OSS 20B details →Claude Opus 4.1 details →

FAQ

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