Is GLM-5.1 or Claude Sonnet 4.5 cheaper?

GLM-5.1 is cheaper on output tokens ($4.40 vs $15.00 per 1M).

Which has the larger context window, GLM-5.1 or Claude Sonnet 4.5?

Both models offer a similar context window.

GLM-5.1 vs Claude Sonnet 4.5

GLM-5.1 is cheaper on output tokens. Choose GLM-5.1 or Claude Sonnet 4.5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GLM-5.1	Claude Sonnet 4.5
Provider	Merge Gateway	Merge Gateway
Input / 1M tokens	$1.40	$3.00
Output / 1M tokens	$4.40	$15.00
Context window	200K	200K
Parameters	754B	—
Open weights	Yes	No
Released	Apr 2026	Sep 2025

GLM-5.1 details →Claude Sonnet 4.5 details →

FAQ

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