Google announced Gemini 3.5 Pro in May 2026 for the following month but missed the date: in July, Bloomberg reported that the model's programming performance was falling short of internal targets despite revised training data. The company did not name a new date.
On September 30, 2026, Google introduced Gemini 4 Argon instead and canceled Gemini 3.5 Pro for good. For now, Argon is only available to selected cyber defenders in the Fairwind program and to US authorities; Google has not yet given a date for broader access. This dossier collects the posts on this storyline.
