Google announced Gemini 4 Argon on September 30, 2026, positioning the new frontier large language model as its strongest yet for long-horizon coding, enterprise tasks, and cybersecurity defense. The phased rollout began immediately with vetted partners in the Fairwind Program, following U.S. government pre-release review, rather than broad API or consumer access. Argon leads benchmarks such as DeepSWE v1.1 at 77.9% and the Vals Index while offering a 1-million-token output limit and introductory pricing of $2/$10 per million input/output tokens. Traders are watching for the next expansion to paid API users and Google AI Ultra subscribers, which Google described as coming “as soon as possible” after initial feedback shapes safeguards. Competitive pressure from GPT-6 Astra and Claude Opus 5.5 continues to shape release expectations.