Is GLM 5.1 Fast or GLM 5.1 cheaper?

GLM 5.1 is cheaper on output tokens ($4.40 vs $8.80 per 1M).

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

Both models offer a similar context window.

GLM 5.1 Fast vs GLM 5.1

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

Spec	GLM 5.1 Fast	GLM 5.1
Provider	Fireworks AI	Fireworks AI
Input / 1M tokens	$2.80	$1.40
Output / 1M tokens	$8.80	$4.40
Context window	203K	203K
Parameters	—	754B
Open weights	Yes	Yes
Released	Apr 2026	Apr 2026

GLM 5.1 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.