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Gemini 2.5 Flash marked deprecated; API calls will shift to 3.5 Flash-Lite on December 1

一句重點：If your code specifies gemini-2.5-flash, a different model will answer a month from now, and the price will change too.

發生什麼事

Starting December 1, 2026, API calls that specify gemini-2.5-flash will instead be routed to gemini-3.5-flash-lite, with charges based on Gemini 3.5 Flash-Lite pricing. Google marked 2.5 Flash as deprecated in its Gemini API changelog, and the model is already absent from the Google AI Studio picker. Google has also marked gemini-2.5-pro as deprecated; it can no longer be selected in AI Studio either. These details come from Google's official announcement (🗣 self-reported).

01Sources

  • Gemini API changelog: Google's official Gemini API update log, dated 2026-11-02 (the page gives a date only); gemini-2.5-flash and gemini-2.5-pro are listed as deprecated.

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