Yes! Outranking uses GPT-3 along with NLP and NLG for better results.
Outranking is more of a SERP analysis, content research, optimization and creation platform for high traffic. Keyword Research can be done accurately on MOZ, SEMRUSH or ubersuggest.com
Yes, Outranking uses natural language generation for better results.
Yes. outranking works on your grammar mistakes, You can also add Grammarly extension for better writing.
As of now, they don't have it, But it will be added soon in new releases as per the road map created by outranking.