Is GLM-5.1 (Z.ai) or GPT-5.4 cheaper?

GLM-5.1 (Z.ai) is cheaper on output tokens ($3.38 vs $15.00 per 1M).

Which has the larger context window, GLM-5.1 (Z.ai) or GPT-5.4?

GPT-5.4 has the larger context window (1.1M tokens).

GLM-5.1 (Z.ai) vs GPT-5.4

GLM-5.1 (Z.ai) is cheaper on output tokens, while GPT-5.4 offers a larger context window. Choose GLM-5.1 (Z.ai) or GPT-5.4 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GLM-5.1 (Z.ai)	GPT-5.4
Provider	AIHubMix	AIHubMix
Input / 1M tokens	$0.85	$2.50
Output / 1M tokens	$3.38	$15.00
Context window	200K	1.1M
Parameters	—	—
Open weights	Yes	No
Released	Mar 2026	Mar 2026

GLM-5.1 (Z.ai) details →GPT-5.4 details →

FAQ

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