Is Claude Sonnet 4 or Claude Opus 4.1 cheaper?

Claude Sonnet 4 is cheaper on output tokens ($15.00 vs $75.00 per 1M).

Which has the larger context window, Claude Sonnet 4 or Claude Opus 4.1?

Both models offer a similar context window.

Claude Sonnet 4 vs Claude Opus 4.1

Claude Sonnet 4 is cheaper on output tokens. Choose Claude Sonnet 4 or Claude Opus 4.1 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Claude Sonnet 4	Claude Opus 4.1
Provider	FastRouter	FastRouter
Input / 1M tokens	$3.00	$15.00
Output / 1M tokens	$15.00	$75.00
Context window	200K	200K
Parameters	—	—
Open weights	No	No
Released	May 2025	Aug 2025

Claude Sonnet 4 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.