Is GLM 5.2 (Free) or GPT-5.1-Codex cheaper?

GLM 5.2 (Free) is cheaper on output tokens ($0.00 vs $10.00 per 1M).

Which has the larger context window, GLM 5.2 (Free) or GPT-5.1-Codex?

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

GLM 5.2 (Free) vs GPT-5.1-Codex

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

Spec	GLM 5.2 (Free)	GPT-5.1-Codex
Provider	ZenMux	ZenMux
Input / 1M tokens	$0.00	$1.25
Output / 1M tokens	$0.00	$10.00
Context window	1M	400K
Parameters	—	—
Open weights	Yes	No
Released	Jun 2026	Nov 2025

GLM 5.2 (Free) 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.