Gemini Deep Research pro-preview agent deprecated; migrate by October 23, 2026

Google is deprecating the deep-research-pro-preview-12-2025 Deep Research agent, which will be shut down on October 23, 2026.

Developers should update the agent parameter in interactions.create requests to deep-research-preview-04-2026, built for speed and streaming to client UIs, or deep-research-max-preview-04-2026, built for maximum comprehensiveness in automated context gathering and synthesis.