You no longer have to manually start Gemini summaries for long email chains, but you can also opt out if you don't want them.

Google is making its Gemini AI assistant a more active part of your Gmail experience by automatically showing summary cards at the top of certain emails. These cards are designed to help you quickly understand the main points of long or complex messages,

Google's AI Gemini will now automatically summarize long email threads for some users, the company said in a blog post. Previously, users had to tap "Summarize this email" for Gemini to generate key points.