Is Claude Opus 4 or Claude Opus 4.5 cheaper?

Claude Opus 4.5 is cheaper on output tokens ($25.00 vs $75.00 per 1M).

Which has the larger context window, Claude Opus 4 or Claude Opus 4.5?

Both models offer a similar context window.

Claude Opus 4 vs Claude Opus 4.5

Claude Opus 4.5 is cheaper on output tokens. Choose Claude Opus 4 or Claude Opus 4.5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Claude Opus 4	Claude Opus 4.5
Provider	Abacus	Abacus
Input / 1M tokens	$15.00	$5.00
Output / 1M tokens	$75.00	$25.00
Context window	200K	200K
Parameters	—	—
Open weights	No	No
Released	May 2025	Nov 2025

Claude Opus 4 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.