Long Decode

Google has opened access to Gemini 4 Carbon, its most capable reasoning model to date, targeting complex software engineering, multi-step agentic tasks, scientific research and cybersecurity. It offers a unified context window of roughly 1.05 million tokens, accepts text, image, video, audio and PDF inputs, and provides three reasoning-effort tiers; it is available to paid developers via the Gemini API and AI Studio at an introductory price of $2 per million input tokens and $10 per million output tokens.