Is Claude Opus 4.8 Fast or OpenAI GPT OSS 120B cheaper?

OpenAI GPT OSS 120B is cheaper on output tokens ($0.30 vs $60.00 per 1M).

Which has the larger context window, Claude Opus 4.8 Fast or OpenAI GPT OSS 120B?

Claude Opus 4.8 Fast has the larger context window (1M tokens).

Claude Opus 4.8 Fast vs OpenAI GPT OSS 120B

OpenAI GPT OSS 120B is cheaper on output tokens, while Claude Opus 4.8 Fast offers a larger context window. Choose Claude Opus 4.8 Fast or OpenAI GPT OSS 120B based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Claude Opus 4.8 Fast	OpenAI GPT OSS 120B
Provider	Venice AI	Venice AI
Input / 1M tokens	$12.00	$0.07
Output / 1M tokens	$60.00	$0.30
Context window	1M	128K
Parameters	—	117B
Open weights	No	Yes
Released	May 2026	Nov 2025

Claude Opus 4.8 Fast details →OpenAI GPT OSS 120B details →

FAQ

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