Google’s next flagship Pro-tier model, Gemini 4 Argon, entered limited rollout on September 30, 2026, to select cybersecurity partners through the Fairwind Program after months of post-training and safety work, following the November 2025 Gemini 3 Pro and February 2026 Gemini 3.1 Pro releases. The company has deprioritized the long-teased Gemini 3.5 Pro in favor of this larger frontier model optimized for long-horizon coding, agentic workflows, and enterprise tasks, with phased public expansion promised “as soon as possible” while it completes voluntary U.S. government evaluations. Traders are monitoring whether the current restricted access meets public-availability criteria or if a broader Gemini API or app launch occurs before key deadlines, amid competitive pressure from OpenAI and Anthropic’s faster iteration cadence and Google’s historical six-month release rhythm.