GPT-5.6 Luna alternatives
Quick answer · Updated July 2026
The closest alternative to GPT-5.6 Luna is GPT-5.6 Terra — comparable intelligence (— vs —); for a cheaper option, GLM 5.2 runs $0.546/M vs $1.00/M; for more speed, Morph V3 Large hits 2.9k t/s; and the best open-weight substitute is GLM 5.2.
Closest match
Cheaper alternatives
glm-5.2
$0.546/M input · 51.1 intel
minimax-m3
$0.300/M input · 44.4 intel
deepseek-v4-pro
$0.435/M input · 44.3 intel
kimi-k2.6
$0.650/M input · 44.2 intel
mimo-v2.5-pro
$0.435/M input · 42.2 intel
kimi-k2.7-code
$0.720/M input · 41.9 intel
Faster alternatives
Open-source alternatives
glm-5.2
51.1 intel · open weights · 1.0M ctx
minimax-m3
44.4 intel · open weights · 1.0M ctx
deepseek-v4-pro
44.3 intel · open weights · 1.0M ctx
kimi-k2.6
44.2 intel · open weights · 262K ctx
mimo-v2.5-pro
42.2 intel · open weights · 1.0M ctx
kimi-k2.7-code
41.9 intel · open weights · 262K ctx
Frequently asked
What is the best alternative to GPT-5.6 Luna?
GPT-5.6 Terra is the closest alternative to GPT-5.6 Luna, with an Intelligence Index of — (GPT-5.6 Luna scores —) at $2.50 per million input tokens.
Is there a cheaper alternative to GPT-5.6 Luna?
Yes — GLM 5.2 costs $0.546 per million input tokens versus $1.00 for GPT-5.6 Luna, while staying within ~8 points of its Intelligence Index.
Is there an open-source alternative to GPT-5.6 Luna?
GLM 5.2 is the strongest open-weight alternative to GPT-5.6 Luna — downloadable from Hugging Face and self-hostable, scoring 51.1 on intelligence.