Is GPT-5.6 Luna (AWS Mantle) or GLM-5.3 (reka-ai) cheaper?

GPT-5.6 Luna (AWS Mantle) is cheaper on output tokens ($1.32 vs $3.96 per 1M).

Which has the larger context window, GPT-5.6 Luna (AWS Mantle) or GLM-5.3 (reka-ai)?

GLM-5.3 (reka-ai) has the larger context window (1M tokens).

GPT-5.6 Luna (AWS Mantle) vs GLM-5.3 (reka-ai)

GPT-5.6 Luna (AWS Mantle) is cheaper on output tokens, while GLM-5.3 (reka-ai) offers a larger context window. Choose GPT-5.6 Luna (AWS Mantle) or GLM-5.3 (reka-ai) based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT-5.6 Luna (AWS Mantle)	GLM-5.3 (reka-ai)
Provider	LLM Gateway	LLM Gateway
Input / 1M tokens	$0.22	$1.17
Output / 1M tokens	$1.32	$3.96
Context window	922K	1M
Parameters	—	—
Open weights	No	Yes
Released	Jul 2026	Aug 2026

GPT-5.6 Luna (AWS Mantle) details →GLM-5.3 (reka-ai) details →

FAQ

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