Logan Kilpatrick of Google said on X that pretraining has begun for Gemini 4. He described the run as the company’s most demanding to date, without disclosing compute scale, training duration, or a target release window.
The post landed alongside a separate Google release of three new Gemini Flash models, which already carries this week’s concrete product news. The Gemini 4 disclosure covers no shipping product yet, only a claim about the scale of an internal training run still underway.
Treat “most ambitious” as Kilpatrick’s own characterization, not an independently verified figure; Google has not published parameter counts, benchmark targets, or compute budgets for the run. Announcing a pretraining start before any output exists functions as a signal to investors and competing labs as much as to developers, a way of asserting momentum before any results exist to check it.
Watch for Google’s next update: a training run description without benchmark data is not yet a product decision point, and operators should hold off adjusting Gemini roadmaps until Google publishes real capability evidence.
Announced by Logan Kilpatrick of Google, on X, July 21, 2026.
