A Gemini Deep Research Preview Shuts Down on 23 October 2026
The 8 October API note deprecates deep-research-pro-preview-12-2025 and names two replacement agent ids.
Direct answer
The Gemini API release notes for 8 October 2026 say deep-research-pro-preview-12-2025 is deprecated and will be shut down on 23 October 2026. Requests should set the agent parameter to deep-research-preview-04-2026 or deep-research-max-preview-04-2026.
The Gemini API release notes for 8 October 2026 deprecate the Deep Research agent id deep-research-pro-preview-12-2025 and say it will be shut down on 23 October 2026. The migration line says to update the agent parameter in interactions.create requests. The two ids it names are deep-research-preview-04-2026 and deep-research-max-preview-04-2026.
The page describes the first replacement as designed for speed and efficiency, and as ideal to stream back to a client UI. It describes the second as maximum comprehensiveness for automated context gathering and synthesis. It does not print a price, a source-count limit, or a citation schema for either agent on this changelog entry. An April 21 note on the same page says those two ids launched with collaborative planning, visualization support, MCP server integration, and File Search. The October note is the shutdown date for the older preview id, not a new feature list.
The shutdown date is specific
The sentence gives 23 October 2026 as the shutdown day for deep-research-pro-preview-12-2025. It does not say the two April agent ids shut down on that day. The instruction is to move the agent parameter off the December 2025 preview id.
Source: Gemini API release notes.
FAQ
- Which replacement is described as the faster one?
- deep-research-preview-04-2026, described as designed for speed and efficiency and as suitable to stream back to a client UI.
- Which field changes in the request?
- The agent parameter on interactions.create.