Google announced Gemini 4 Argon on September 30, 2026, marking the start of its Gemini 4 generation with limited rollout to select cybersecurity partners through the Fairwind Program. The model targets complex workflows in software engineering, knowledge work, and cyber defense, claiming frontier-level performance on several coding and benchmark tasks while trailing rivals like OpenAI's Astra on others. It follows months of delays after Gemini 3, the cancellation of a planned Gemini 3.5 Pro, and leadership changes at DeepMind, with the new chief signaling rapid post-training iterations for an early public push. Traders are watching phased expansion to enterprises and consumers, alongside ongoing safety evaluations, as key near-term catalysts for broader availability.