Google announced that its Gemini Deep Research Pro preview agent (deep-research-pro-preview-12-2025) is being retired. The service will stop on October 23, 2026. Users should change the agent parameter in their API calls to either deep-research-preview-04-2026, which is faster and stream‑friendly, or deep-research-max-preview-04-2026 for more thorough context gathering.
Why it matters
Developers using Gemini’s Deep Research API must update their code before Oct 23 2026 or their requests will fail.
