Deprecation model
Google lists May 7, 2027 as the earliest shutdown date for gemini-3.1-flash-lite on the Gemini API. The recommended replacement is gemini-3.5-flash-lite.
What changes
The Gemini API deprecations page lists gemini-3.1-flash-lite (GA May 7, 2026) with a shutdown date of May 7, 2027 and recommends gemini-3.5-flash-lite. The page says its dates are the earliest possible and that Google will give advance notice of the exact date. The release notes contain no deprecation announcement yet.
Deprecation: Still works; removal is announced.
What to do
Plan a move to gemini-3.5-flash-lite before May 2027. Re-check cost, latency and output quality on your evals before switching.
Strings to search for
gemini-3.1-flash-lite