Google promised Gemini 3.5 Pro in June and has missed three target dates. Will it launch the model by Oct 10?

Google did not ship Gemini 3.5 Pro by Oct. 10, extending a delay that began when the company missed its original June target. Bloomberg reported July 16 that the model remained months behind schedule after a late training-data update failed to deliver the coding-performance gains Google wanted, and a company spokesperson said July 21 that the model was in partner testing and would launch "as soon as it's ready," without naming a new date. Google's August "Made by Google" event came and went with no 3.5 Pro reveal. Through the fall, Google instead shipped a string of smaller Gemini Flash updates — four in 106 days, according to Fortune — while the flagship Pro model stayed unreleased, and executives increasingly pointed to a larger successor, Gemini 4, which CEO Sundar Pichai said in July the company had begun training. By September, public attention around Google's roadmap had shifted to Gemini 4's timeline rather than any remaining plan for 3.5 Pro. The community leaned toward a launch, with 53% voting yes, but the model never materialized by the deadline. The episode fits a broader pattern of 2026 frontier-model slippage, with Google repeatedly setting and missing internal release targets for its flagship model even as competitors continued shipping rival systems on schedule.