Google announced Gemini 4 Carbon on October 28, 2026, as its strongest frontier large language model with leading scores on the Artificial Analysis Intelligence Index v5.0 and state-of-the-art results in cybersecurity benchmarks for vulnerability detection, exploitation, and patching. The company is following the same deliberate phased rollout used for Gemini 4 Argon two weeks earlier: initial access to a subset of vetted cyber defenders through the Fairwind Program, followed by gradual expansion after U.S. government pre-release testing and guardrail feedback. This precedent produced broad API and consumer availability in roughly 13 days, positioning the November 9–15 window as the market’s clear leader while later periods reflect uncertainty over any delays in scaling beyond early partners.