Google announced Gemini 4 Carbon on October 28, 2026, as its strongest frontier large language model with state-of-the-art gains in cybersecurity tasks such as vulnerability detection, exploitation, and patching, plus long-horizon agentic coding. The model launched first to a vetted subset of cyber defenders through the Fairwind Program, with phased expansion to additional trusted partners and U.S. government voluntary pre-release testing before broader developer, business, and consumer availability via the Gemini API and product surfaces “as soon as possible.” This mirrors the timeline for Gemini 4 Argon, which moved from limited Fairwind access on September 30 to general availability roughly two weeks later. With the announcement just one week old as of November 4 and Google emphasizing rapid iteration on feedback and safeguards, traders have placed heavy weight on the November 9–15 window as the most likely period for wider rollout, while later dates reflect the uncertainty around exact safety and testing milestones.