Google deprecates Gemini 3.5 Flash and 3.7 Flash in the Gemini API

Google's Gemini API changelog of October 8, 2026 deprecates two Flash models. Both are no longer selectable in Google AI Studio, and API requests to them are routed automatically to a newer model.

• gemini-3.5-flash is replaced by gemini-3.6-flash. Google tells developers to update the model string to gemini-3.6-flash (or gemini-3.8-flash).
• gemini-3.7-flash is replaced by gemini-3.8-flash, which developers should switch to.