Is Claude Opus 4.6 (Fast) or GPT OSS 120B cheaper?

GPT OSS 120B is cheaper on output tokens ($0.15 vs $150.00 per 1M).

Which has the larger context window, Claude Opus 4.6 (Fast) or GPT OSS 120B?

Claude Opus 4.6 (Fast) has the larger context window (1M tokens).

Claude Opus 4.6 (Fast) vs GPT OSS 120B

GPT OSS 120B is cheaper on output tokens, while Claude Opus 4.6 (Fast) offers a larger context window. Choose Claude Opus 4.6 (Fast) or GPT OSS 120B based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Claude Opus 4.6 (Fast)	GPT OSS 120B
Provider	OpenRouter	OpenRouter
Input / 1M tokens	$30.00	$0.03
Output / 1M tokens	$150.00	$0.15
Context window	1M	131K
Parameters	—	117B
Open weights	No	Yes
Released	Apr 2026	Aug 2025

Claude Opus 4.6 (Fast) 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.