Is Claude Opus 4.1 or GLM-5.1 cheaper?

GLM-5.1 is cheaper on output tokens ($4.40 vs $75.00 per 1M).

Which has the larger context window, Claude Opus 4.1 or GLM-5.1?

GLM-5.1 has the larger context window (205K tokens).

Claude Opus 4.1 vs GLM-5.1

GLM-5.1 is cheaper on output tokens, while GLM-5.1 offers a larger context window. Choose Claude Opus 4.1 or GLM-5.1 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Claude Opus 4.1	GLM-5.1
Provider	OpenCode Zen	OpenCode Zen
Input / 1M tokens	$15.00	$1.40
Output / 1M tokens	$75.00	$4.40
Context window	200K	205K
Parameters	—	754B
Open weights	No	Yes
Released	Aug 2025	Apr 2026

Claude Opus 4.1 details →GLM-5.1 details →

FAQ

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