Google’s decision to skip the long-teased Gemini 3.5 Pro and instead prioritize Gemini 4 has shaped recent trader views on the next Pro-class model. After Gemini 3.1 Pro launched in February 2026, the company shifted resources to Flash variants and began Gemini 4 pre-training in July, with post-training and safety work now underway. The September 30 limited rollout of Gemini 4 Argon to select cybersecurity partners marked the first frontier-level advance in nearly a year, though full public availability remains pending. Competitive pressure from OpenAI and Anthropic, plus Google’s emphasis on agentic coding and cyber capabilities, continues to influence timelines. Traders are watching for any broader Gemini 4 Pro release or API expansion before year-end.