Gemini API changelog: TTS streaming for flash-tts-preview, Veo and Imagen models scheduled for shutdown

What's new

• TTS streaming (Jun 17): streamGenerateContent now works for gemini-3.1-flash-tts-preview, useful for real-time voice agents.
• Veo shutdown (announced Jun 15, retires Jun 30): older Veo models retire; migrate to Veo 3.1 preview or GA.
• Imagen / Gemini image deprecations (announced Jun 15, retires Aug 17): Imagen 4 and earlier Gemini image models retire; migrate to gemini-3.1-flash-image (Nano Banana 2) or gemini-3-pro-image (Nano Banana Pro).
• GMP Contextual View experiment for Google Maps grounding is also being shut down.

Why it matters

Google is aggressively cleaning up the legacy stack – if you're pinned to Imagen 4 or older Veo models you have deadlines this quarter. It's also a clear signal that the Nano Banana family is the new visual default.

How to try it

New model IDs are in the Gemini API docs; streaming TTS requires streamGenerateContent against gemini-3.1-flash-tts-preview.