Google announced Gemini 4 Argon on September 30, 2026, as its new frontier large language model optimized for long-horizon software engineering, enterprise knowledge work, and cybersecurity defense, with an industry-leading 1 million output token limit. The model rolled out immediately to vetted partners via the Fairwind Program for safety testing, while internal Google teams already use it for complex coding and infrastructure tasks. It leads or ties key benchmarks such as DeepSWE v1.1 and Vals Index against GPT-6 Astra and Claude Opus 5.5, with introductory API pricing set at $2 per million input tokens. Broader access for paid developers and Google AI Ultra subscribers is planned next, though no firm public release date has been confirmed. Traders are watching for any official timeline updates or early API availability that could accelerate general rollout.