What changed: Google's Gemini API is deprecating the deep-research-pro-preview-12-2025 Deep Research agent, which will be shut down on October 23, 2026. Existing requests must move to deep-research-preview-04-2026 or deep-research-max-preview-04-2026.
Who is affected
Businesses calling the Gemini API Deep Research agent via the agent parameter in interactions.create requests; the source does not mention any other restriction.
What it means for your business
For businesses using Gemini API's Deep Research feature, this means the current integration will stop working after October 23, 2026 unless the agent parameter is updated in code.
What to do
Update the agent parameter in interactions.create requests from deep-research-pro-preview-12-2025 to deep-research-preview-04-2026 or deep-research-max-preview-04-2026, and complete the migration before October 23, 2026.
When it takes effect
October 23, 2026 (shutdown date).
Source: https://ai.google.dev/gemini-api/docs/changelog?hl=en#10-08-2026
