Here is a clearer comparison of open-weight SOTA-only models with GPT-5.6 added:
artificialanalysis.ai/?models=glm-5-3-flash%2Cdeepseek-v4-flash%2Cdeepseek-v4-flash-vision%2Cqwen3-8-flash-next%2Cqwen3-8-27b%2Cgpt-5-6-sol%2Cgpt-5-6-luna%2Cgpt-5-6-terra&intelligence=artificial-analysis-intelligence-index#intelligence-tabs
Yes, you can have your own GPT-5.6 equivalent at home.
And here is a list of open-weight models only (AA calls them "open-source", but they are mostly open-weight) (in the table click "Select all" to see the best straight away):
artificialanalysis.ai/models/open-source#artificial-analysis-intelligence-index