Leakers claim a first Gemini 4 Pro checkpoint exists and point to October 2026 for launch, with Google skipping the delayed Gemini 3.5 Pro entirely. Spicier claims say a 'gemini-3.8-flash' topping AI Arena charts is actually Gemini 4 Pro incognito, beating GPT-6 Astra and Fable 5.1. Confirmed: Google says Gemini 4 pre-training began in July. No date, specs, or benchmarks are official.