Is GLM 5.2 Fast or GLM 5.1 cheaper?

GLM 5.1 is cheaper on output tokens ($4.40 vs $6.60 per 1M).

Which has the larger context window, GLM 5.2 Fast or GLM 5.1?

GLM 5.2 Fast has the larger context window (1M tokens).

GLM 5.2 Fast vs GLM 5.1

GLM 5.1 is cheaper on output tokens, while GLM 5.2 Fast offers a larger context window. Choose GLM 5.2 Fast or GLM 5.1 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GLM 5.2 Fast	GLM 5.1
Provider	Fireworks AI	Fireworks AI
Input / 1M tokens	$2.10	$1.40
Output / 1M tokens	$6.60	$4.40
Context window	1M	203K
Parameters	—	754B
Open weights	Yes	Yes
Released	Jun 2026	Apr 2026

GLM 5.2 Fast details →GLM 5.1 details →

FAQ

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