Google unveiled Gemini 4 Carbon on Wednesday, its second flagship AI model in two weeks, and the company says it’s the best-performing model it has ever built. Independent benchmark tracker Artificial Analysis agrees, at least for now: Carbon scored 59 on its Intelligence Index v5.0, putting it ahead of Anthropic’s Claude Opus 5.5 at 58 and OpenAI’s GPT-6 Astra at 57.
You can’t use it yet.
That’s the catch, and it’s deliberate. Like its predecessor Gemini 4 Argon, Carbon is going first to a small group of vetted cybersecurity defenders through Google’s Fairwind Program, plus the US government through a voluntary pre-release testing process. Everyone else — developers, businesses, and regular users — will have to wait for a wider rollout Google hasn’t dated.
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