Google has delayed the launch of Gemini 3.5 Pro after the model failed to meet internal performance goals, particularly in coding capabilities, pushing it past its original June 2026 release window with no firm new date on the calendar.
Alphabet’s stock dropped approximately 4% during intraday trading following Bloomberg’s report on the postponement.
What went wrong with Gemini 3.5 Pro
Gemini 3.5 Pro reportedly fell short of Google’s own internal benchmarks, with coding capabilities being the primary pain point. The original release window was June 2026. Some sources now point to a potential mid-July launch, possibly around July 17, but only if current efforts to improve the model actually work.
Reports suggest internal dissatisfaction is running high. There have apparently been discussions about scrapping previous base models entirely and rebuilding from scratch. The problems extend beyond just coding: token efficiency, AI agentic features, and the model’s ability to handle long-horizon tasks effectively have all been flagged as structural challenges.