Breaking model
Gemini 2.5 Flash Preview 09-2025 was shut down on the Gemini API February 17, 2026; the listed replacement is gemini-3.6-flash.
What changes
Google announced on January 15, 2026 that the model would shut down February 17, 2026, and the changelog records it as shut down that day. The deprecations table lists it as gemini-2.5-flash-preview-09-25, while the launch changelog and models page use gemini-2.5-flash-preview-09-2025. The recommended replacement is gemini-3.6-flash.
Breaking: Calls fail after this date.
What to do
Switch to gemini-3.6-flash and re-check output quality and cost on your evals before cutting over.
Strings to search for
gemini-2.5-flash-preview-09-25gemini-2.5-flash-preview-09-2025