After launching the Gemini 4 Argon model earlier this month, Google released the Gemini 4 Carbon model on Wednesday, which it says is built for sustained agentic workflows and delivers a “significant leap in cybersecurity capabilities.”Testing shows Carbon outperforming Argon, OpenAI’s GPT-6 Astra, and Anthropic’s Claude Opus 5.5 on benchmarks for coding, knowledge work, science, math, multimodal understanding, and cybersecurity, Google says. On cybersecurity, Carbon can detect critical vulnerabilities, validate them, and generate high-quality patches.The model is also quite effective at resisting prompt injections, a technique cybercriminals use to force AI models to bypass their own safeguards. Internal tests put Carbon on top with a 0.0% attack success rate, followed by Argon at 0.7%, and Claude Opus 5.5 with a 1.0% success rate.
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Carbon will initially be available to “a subset of cyber defenders” at $2 per million input tokens and $10 per million output tokens. The model will then gradually roll out to Google’s trusted partners through its Fairwind Program. Developers, businesses, and consumers will have access “as soon as possible,” Google says.
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“Pushing the frontier forward requires moving fast while remaining deliberate about deployment,” Google says. “With Gemini 4 Carbon, our goal is to deliver meaningful leaps in software engineering and cybersecurity defense without compromising on safety or reliability.”
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