Is GPT 5.1 Codex Max or GLM 4.5 cheaper?

GLM 4.5 is cheaper on output tokens ($2.20 vs $10.00 per 1M).

Which has the larger context window, GPT 5.1 Codex Max or GLM 4.5?

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

GPT 5.1 Codex Max vs GLM 4.5

GLM 4.5 is cheaper on output tokens, while GPT 5.1 Codex Max offers a larger context window. Choose GPT 5.1 Codex Max or GLM 4.5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT 5.1 Codex Max	GLM 4.5
Provider	Vercel AI Gateway	Vercel AI Gateway
Input / 1M tokens	$1.25	$0.60
Output / 1M tokens	$10.00	$2.20
Context window	400K	128K
Parameters	—	355B
Open weights	No	Yes
Released	Nov 2025	Jul 2025

GPT 5.1 Codex Max details →GLM 4.5 details →

FAQ

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