Google announces Gemini 4 Carbon, its latest frontier AI model that you can't use

Google announced Gemini 4 Carbon, an improvement on Gemini 4 Argon released two weeks earlier, with a staged release that may take time. Google says Carbon shows a significant leap in vulnerability detection, validation and remediation, is twice as likely as Argon to generate vulnerability-free code, and gained 89 points on WebDev Arena to rank fourth. Carbon edges out Argon and beats GPT-6 Astra, Claude Opus 5.5 and Claude Fable 5.1 in almost every test, though the article notes the margins are just a few points.