Google rolls out Gemini 4 Carbon to AI Ultra subscribers
Argon remains available alongside the new model, while Gemini 3.1 Pro has been removed from the app.
Google has made Gemini 4 Carbon available to AI Ultra subscribers through the Gemini app, AI Mode and Antigravity, following a preview late last month. The company is positioning Carbon for demanding coding, research and knowledge-work tasks.
Argon remains accessible to users on AI Pro and higher plans. Google says it is still the preferred option for most software engineering and knowledge work, while Carbon targets more complex problems, including debugging involving multiple steps and open-ended scientific research. Gemini 3.1 Pro is no longer offered in the app.
Alongside the rollout, Google Antigravity is previewing /swarm, which lets a single prompt coordinate multiple agents. Developers can use Carbon for roles such as architecture, coordination and auditing, with lighter models working in parallel and verifiers checking changes.
Carbon’s introductory token prices are US$2 per million input tokens and US$10 per million output tokens through November 30. After that, the rates rise to US$4 per 1M input tokens and US$20 per 1M output tokens.
Developers can also access Carbon through the paid Gemini API tier in AI Studio and Android Studio. Enterprise access includes Gemini for business, Google Antigravity and specialized agents such as CodeMender and AlphaEvolve.
