In mid-May, Google announced Gemini 3.5 Flash at I/O 2026 and said the Pro version would arrive in June. On stage, Google said it was “showing great improvements.” That deadline has passed with no update on when to expect it.
According to Bloomberg, Google is “taking time to try to improve Gemini 3.5 Pro’s capabilities, particularly in coding.” In late June, Google updated the data being used to train Gemini in an attempt to improve coding skills, but “the results were disappointing.” That timeline suggests development saw a reset between I/O and the missed launch.
The coding challenge at Google
Today’s report also offers insight into Google’s internal AI coding landscape. As of April, “75% of all new code at Google is now AI-generated and approved by engineers, up from 50% last fall.” That’s a staggering jump in less than a year.
But it’s not without friction. Some engineers at Google hold a more purist stance, believing that all important code should be human-written to adhere to Google standards. Engineers internally are also facing AI capacity restraints with tools, and an effort to “unite the company’s internal artificial intelligence coding tools” is underway.
When we’ll see Gemini 3.5 Pro remains the open question.