Google's Gemini 4 Carbon: a second frontier model in two weeks, built for cyber defense
From the AI digest for Oct 28, 2026
What happened: Google DeepMind announced Gemini 4 Carbon on Wednesday, October 28 (~1:00 PM ET) — its "next frontier model," positioned around state-of-the-art cybersecurity and long-horizon capabilities, two weeks after Gemini 4 Argon's September 30 launch. Sundar Pichai framed the cadence himself: "I did say we'd be releasing our models periodically." Announcement-day coverage puts Carbon at #1 on Artificial Analysis' v5.0 Intelligence Index (score 59, with Claude Opus 5.5 and GPT-6 Astra behind it), describes gains in coding and agentic tasks over Argon, and carries vendor numbers including 29% fewer output tokens per task than Opus 5.5 and a claim of more than 10x better output than any publicly available model when generating high-quality security patches — alongside the caveat that GPT-6 Astra remains about 20% cheaper at $6.25.
What's genuinely new: a second Gemini 4-generation model and the first claimed occupant of the closed v5.0 board's top spot. Availability is the tell: Carbon is announced but currently open only to a select group of cybersecurity defenders in Google's Fairwind program, with Google saying it will "expand access as soon as possible" — announced and gated, not broadly shipped.
Watch: how quickly access widens beyond the Fairwind defenders; independent checks of the #1-at-59 claim on a board that can no longer be independently re-run; pricing and API availability; what the "long-horizon" capabilities show in practice.
Sources Google DeepMind (blog) The Verge SiliconAngle MarkTechPost wccftech Google DeepMind on X