Is GLM-5.1 or GLM-4.7-FlashX cheaper?

GLM-4.7-FlashX is cheaper on output tokens ($0.40 vs $4.40 per 1M).

Which has the larger context window, GLM-5.1 or GLM-4.7-FlashX?

Both models offer a similar context window.

GLM-5.1 vs GLM-4.7-FlashX

GLM-4.7-FlashX is cheaper on output tokens. Choose GLM-5.1 or GLM-4.7-FlashX based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GLM-5.1	GLM-4.7-FlashX
Provider	Z.AI	Z.AI
Input / 1M tokens	$1.40	$0.07
Output / 1M tokens	$4.40	$0.40
Context window	200K	200K
Parameters	754B	—
Open weights	Yes	Yes
Released	Apr 2026	Jan 2026

GLM-5.1 details →GLM-4.7-FlashX details →

FAQ

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