Gemini 4 Argon is out

Google DeepMind's frontier model, announced September 30, 2026 and rolled out October 14 to paying Gemini and Antigravity users and the Gemini API (free tier excluded). One-million-token context window; API launch pricing of $2 per million input tokens and $10 per million output through November 30, then $4 and $20. Announcement: https://blog.google/innovation-and-ai/models-and-research/gemini-models/introducing-gemini-4-argon/