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. The model features an industry-leading 1M output token limit and strong benchmark results, including 77.9% on DeepSWE v1.1 and leading scores on the Vals Index, outperforming or matching OpenAI’s GPT-6 Astra and Anthropic’s Claude Opus 5.5 in most reported tests. Initial access is limited to vetted partners in Google’s Fairwind Program and internal teams, with phased expansion planned next for paid API users and Google AI Ultra subscribers. This cautious rollout, driven by safety considerations for frontier capabilities, shapes trader views on near-term availability and real-world performance.