Is GLM 5 or GPT-5.1-Codex cheaper?

GLM 5 is cheaper on output tokens ($2.60 vs $10.00 per 1M).

Which has the larger context window, GLM 5 or GPT-5.1-Codex?

GPT-5.1-Codex has the larger context window (400K tokens).

GLM 5 vs GPT-5.1-Codex

GLM 5 is cheaper on output tokens, while GPT-5.1-Codex offers a larger context window. Choose GLM 5 or GPT-5.1-Codex based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GLM 5	GPT-5.1-Codex
Provider	ZenMux	ZenMux
Input / 1M tokens	$0.58	$1.25
Output / 1M tokens	$2.60	$10.00
Context window	200K	400K
Parameters	744B	—
Open weights	Yes	No
Released	Feb 2026	Nov 2025

GLM 5 details →GPT-5.1-Codex details →

FAQ

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