https://tokencost.app/blog/gemini-2-5-pro-flash-reroute-december-1-cost TokenCost en 2026-11-06T00:00:00.000Z Google reroutes Gemini 2.5 Pro to 3.8 Flash on December 1. The bill can halve for 31 days, then input costs 20% more than 2.5 Pro did, and 2.5 Flash lands on a model that scores 12.