Google makes Gemini 4 Carbon broadly available with introductory API pricing

The introductory price doubles after November 30, so teams weighing a move should budget for the higher rate.

Google has made Gemini 4 Carbon broadly available after a two-week run with a small group of cybersecurity defenders, positioning it above its earlier Gemini 4 Argon model for work that stretches a model's reasoning, such as multi-step coding and open-ended scientific research. Developers can reach it through the paid Gemini API in Google AI Studio and Gemini for business at an introductory $2 per million input tokens and $10 per million output tokens, a price that doubles after November 30. Google also previewed a swarm feature in its Antigravity platform that splits one prompt across coordinated agents, and says Carbon ranked first on several agent benchmarks at more than twice lower cost per task than the next best external model. For security teams, Google reports that Carbon found zero-day flaws at two large SaaS providers within hours, and that its Cloud Vulnerability Research team used it to confirm two open-source bugs as exploitable. Separately, Google DeepMind used Carbon-based agents to help formally verify the code behind the Signal protocol, with Google publishing the specifications and proofs.