Google announced Gemini 4 Argon on September 30, 2026, as its new frontier large language model optimized for long-horizon software engineering, enterprise tasks in legal and finance, and cybersecurity defense. The release began with a limited rollout to vetted participants in Google's Fairwind Program, prioritizing safety testing and U.S. government pre-release review before wider access. Argon leads many internal benchmarks, including a 77.9% score on DeepSWE v1.1 for complex coding workflows, and features an expanded 1M-token output limit. Introductory API pricing starts at $2 per million input tokens and $10 per million output tokens. Traders are watching for the next expansion to paid API users and Google AI Ultra subscribers, as no firm general availability date has been set amid the phased approach.