Is GPT-5.6 Luna or GLM-5.1 cheaper?

GPT-5.6 Luna is cheaper on output tokens ($1.20 vs $4.40 per 1M).

Which has the larger context window, GPT-5.6 Luna or GLM-5.1?

GPT-5.6 Luna has the larger context window (1.1M tokens).

GPT-5.6 Luna vs GLM-5.1

GPT-5.6 Luna is cheaper on output tokens, while GPT-5.6 Luna offers a larger context window. Choose GPT-5.6 Luna or GLM-5.1 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT-5.6 Luna	GLM-5.1
Provider	OpenCode Go	OpenCode Go
Input / 1M tokens	$0.20	$1.40
Output / 1M tokens	$1.20	$4.40
Context window	1.1M	203K
Parameters	—	754B
Open weights	No	Yes
Released	Jul 2026	Apr 2026

GPT-5.6 Luna 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.