Google announced Gemini 4 Argon, its new flagship large language model, on September 30, 2026, after months of delays and the cancellation of the previously promised Gemini 3.5 Pro. The model entered limited release to trusted cybersecurity partners via a phased rollout focused on safety evaluations and guardrails, with broader access to developers, enterprises, and consumers expected soon after. It claims strong results on coding, professional knowledge work, and cyber benchmarks relative to OpenAI and Anthropic frontier models, following DeepMind leadership changes and a shift away from earlier timelines. Traders are monitoring the speed of expanded availability and any additional safety or performance updates as the key near-term catalysts.