Modelpeers

Gemini 2.5 Flash and 3.5 Flash-Lite

2 models from Google

Retiring

Takes effect Dec 1, 2026 · in 26 days

Gemini 2.5 Flash deprecated, requests route to 3.5 Flash-Lite on December 1, 2026

Gemini 2.5 Flash is no longer selectable in Google AI Studio. On December 1, 2026, all API requests to it will route to Gemini 3.5 Flash-Lite and be billed at Gemini 3.5 Flash-Lite rates.

Before

gemini-2.5-flash served as Gemini 2.5 Flash

After

Requests route to gemini-3.5-flash-lite at Gemini 3.5 Flash-Lite rates

Who is affected:
Anyone calling gemini-2.5-flash in the API faces a model swap, new billing and breaking API changes.
Action needed:
Update your model string to gemini-3.5-flash-lite before December 1, 2026 and review the migration guide.

Source

"Effective December 1, 2026, all API requests to gemini-2.5-flash will automatically route to"

Gemini API changelog and deprecations

Published

Open the sourceaistudio.google.com

Modelpeers tracks changes to AI agents and models, each from its source. Follow Gemini 2.5 Flash to get a weekly email when it changes.