Google's decision to skip the long-promoted Gemini 3.5 Pro and instead announce Gemini 4 Argon on September 30 has become the dominant factor in trader views on the next Pro-class model. Argon, a larger frontier model than prior Pro versions, launched in limited access to select cybersecurity partners under safety evaluations, with no public release date despite post-training progress. Recent emphasis on iterative Flash variants, including 3.8 series updates through early October, reflects a shift toward faster releases while the flagship faces extended testing amid competitive pressure from OpenAI and Anthropic. Broader availability could arrive in phased form later in 2026, though historical cadence and ongoing guardrail work introduce uncertainty around exact timing.