**Google announced Gemini 4 Carbon on October 28, 2026, as its latest frontier large language model with leading performance on cybersecurity benchmarks and long-horizon agentic tasks.** It follows Gemini 4 Argon by just two weeks and tops the updated Artificial Analysis Intelligence Index v5.0 at 59 points. Initial access began that same week for a small group of cyber defenders through the Fairwind Program, with phased expansion to additional trusted partners. Google is participating in the U.S. government’s voluntary pre-release testing and has stated it will iterate on guardrails before broader availability “as soon as possible” to developers, businesses, and consumers via API and product surfaces. No exact public release date was given, but pricing matches Argon’s introductory rate of $2 per million input tokens and $10 per million output tokens. This timeline aligns closely with Argon’s path—announced September 30 and generally available by October 13—placing the market’s heavy weighting on November 9–15 as the window for wider rollout. The 80.5% implied probability reflects trader expectations around Google’s accelerated cadence and the short gap between limited and general access in the prior model. No major new announcements have shifted sentiment since the launch, keeping focus on the near-term expansion.