What I'm missing on Claude is a Python sandbox, which at least should be able to use matplotlib, PIL, numpy and pandas and be able to display results the way ChatGPT does.

Claude appears to be really good at Javascript-based conversations.

Also, a search functionality which searches in existing conversation would be at the top of my wish list. AFAIK only Mistral offers this. Gemini is the worst at giving you access to older conversations, where you have to use the "Activity" functionality.