Welcome to Google Gemini 4 Argon

Google's fictional Gemini 4 Argon model, released in October 2026, introduces a unified 1-million-token window for input, thinking, and output. This "long decode" capability allows for much larger single-pass generation tasks, a significant change from previous models. The API now uses a `thinking_level` parameter and includes Python code examples demonstrating how to implement safety checks for token limits and spending. While its introductory pricing is competitive against models like Claude Sonnet 5.5 and GPT-6 Astra, its higher verbosity slightly offsets the cost savings. The model shows uneven performance, excelling at repository-level engineering but lagging in terminal-based tasks.