Gemini 2.5 Pro and 2.5 Flash are to be deprecated on December 1 and redirected to newer models

Patrick Löber, who posts about the Gemini API, says Gemini 2.5 Pro and Gemini 2.5 Flash will be deprecated on December 1 in the Gemini API, and requests to them will be redirected automatically:

• Gemini 2.5 Pro to Gemini 3.8 Flash.
• Gemini 2.5 Flash to Gemini 3.5 Flash-Lite.

The details come from this post alone. Developers who depend on the older models' behavior may want to move to the replacement of their choice before the redirect.