Gemini 4 Argon is available:

— For developers: Build with the Gemini API paid tier and if you’re a Google AI Ultra subscriber, you can try it in @antigravity, @GoogleAIStudio, and @Android Studio.
— For enterprises: Try it in Gemini for business, the API, and @antigravity.
— For everyday users: Try it starting today in the @GeminiApp and AI Mode in Search if you’re a Google AI Ultra or Pro subscriber.
— For scientists & researchers: Apply for a chance to get access to @antigravity highest usage tier free of charge for 6 months (onboarded on a rolling basis), subject to eligibility, capacity, and selection. Applications are now open.
— For cybersecurity defenders: Apply to join the Fairwind Program to get access to Argon without cyber guardrails on a rolling basis.
https://blog.google/innovation-and-ai/models-and-research/gemini-models/introducing-gemini-4-argon/