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Google released its Gemini 4 Carbon frontier model on Wednesday, October 28, 2026, claiming gains in coding, agentic tasks and cybersecurity. It tops the Artificial Analysis Intelligence Index, ahead of Claude Opus 5.5 and GPT-6 Astra. The model is available only to a select group of cybersecurity defenders for now, and Ars Technica described it as a slightly better version of Argon.