Google's Gemini API release notes record no Gemini 3.5 Pro general availability by 31 July 2026; in the 3.5 family only Flash had reached GA, on 19 May (Google, Gemini API release notes).
Resolves YES only if Gemini 3.5 Pro is generally available, not in preview or limited access, to standard developers or consumers on or before 31 July 2026. Google's Gemini API and Vertex AI release notes, which carry dated GA entries. A blog post or press briefing without a release-note entry does not resolve YES.
Google's past AI delays rarely lasted more than three months. We looked at times when Google delayed, paused or mishandled a major AI release, and checked whether the product came out or came back within about three months of its original target. The delays were real and sometimes embarrassing. The loss of top researchers is newer and less tested.