GPT-5.6 Sol Pro alternatives
Quick answer · Updated July 2026
The closest alternative to GPT-5.6 Sol Pro is GPT-5.6 Luna Pro — comparable intelligence (— vs —); for a cheaper option, GPT-5.6 Terra runs $2.50/M vs $5.00/M; for more speed, Morph V3 Large hits 3.2k t/s; and the best open-weight substitute is GLM 5.2.
Closest match
Cheaper alternatives
gpt-5.6-terra
$2.50/M input · 55.0 intel
grok-4.5
$2.00/M input · 53.8 intel
claude-sonnet-5
$2.00/M input · 53.4 intel
gpt-5.4
$2.50/M input · 51.4 intel
gpt-5.6-luna
$1.00/M input · 51.2 intel
glm-5.2
$0.540/M input · 51.1 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 Sol Pro?
GPT-5.6 Luna Pro is the closest alternative to GPT-5.6 Sol Pro, with an Intelligence Index of — (GPT-5.6 Sol Pro scores —) at $1.00 per million input tokens.
Is there a cheaper alternative to GPT-5.6 Sol Pro?
Yes — GPT-5.6 Terra costs $2.50 per million input tokens versus $5.00 for GPT-5.6 Sol Pro, while staying within ~8 points of its Intelligence Index.
Is there an open-source alternative to GPT-5.6 Sol Pro?
GLM 5.2 is the strongest open-weight alternative to GPT-5.6 Sol Pro — downloadable from Hugging Face and self-hostable, scoring 51.1 on intelligence.