Google's September 30 announcement of Gemini 4 Argon—a larger flagship model positioned above prior Pro versions—has anchored trader sentiment, as the rollout began exclusively with select cybersecurity partners and U.S. government safety evaluations rather than a broad public launch. The company simultaneously dropped plans for the long-promised Gemini 3.5 Pro after repeated delays and DeepMind leadership shifts, while continuing rapid iteration on lighter Flash variants. With no confirmed public availability window and emphasis on phased, safety-focused deployment, the market assigns an implied 79.5% probability to no Pro-model release by October 31. Traders appear to view any earlier October dates as inconsistent with typical post-training and evaluation timelines observed in prior Gemini cycles.