Is Claude Sonnet 4.5 or Claude Opus 4.5 cheaper?

Claude Sonnet 4.5 is cheaper on output tokens ($18.75 vs $30.00 per 1M).

Which has the larger context window, Claude Sonnet 4.5 or Claude Opus 4.5?

Both models offer a similar context window.

Claude Sonnet 4.5 vs Claude Opus 4.5

Claude Sonnet 4.5 is cheaper on output tokens. Choose Claude Sonnet 4.5 or Claude Opus 4.5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Claude Sonnet 4.5	Claude Opus 4.5
Provider	Venice AI	Venice AI
Input / 1M tokens	$3.75	$6.00
Output / 1M tokens	$18.75	$30.00
Context window	198K	198K
Parameters	—	—
Open weights	No	No
Released	Jan 2025	Dec 2025

Claude Sonnet 4.5 details →Claude Opus 4.5 details →

FAQ

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