Is GPT 5.1 Codex Mini or GLM 4.5 cheaper?

GLM 4.5 is cheaper on output tokens ($1.30 vs $2.00 per 1M).

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

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

GPT 5.1 Codex Mini vs GLM 4.5

GLM 4.5 is cheaper on output tokens, while GPT 5.1 Codex Mini offers a larger context window. Choose GPT 5.1 Codex Mini 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 Mini	GLM 4.5
Provider	NanoGPT	NanoGPT
Input / 1M tokens	$0.25	$0.30
Output / 1M tokens	$2.00	$1.30
Context window	400K	128K
Parameters	—	355B
Open weights	No	No
Released	Nov 2025	Apr 2025

GPT 5.1 Codex Mini 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.