# Google Research — Deep researcher with test-time diffusion

- Company: Google Research (research.google)
- Announced: 2025-09-19T20:43:00+00:00
- Category: research-paper
- Subject: Research
- Source: https://research.google/blog/deep-researcher-with-test-time-diffusion/
- Record: https://forck.live/items/1417-deep-researcher-with-test-time-diffusion

Google Research introduces Test-Time Diffusion Deep Researcher (TTD-DR), a framework that models research report writing as a diffusion process, iteratively drafting and revising reports using retrieved information. It achieves state-of-the-art results on long-form report writing and multi-hop reasoning tasks.

## Evidence

Verbatim from https://research.google/blog/deep-researcher-with-test-time-diffusion/:

> We introduce Test-Time Diffusion Deep Researcher (TTD-DR), a framework that uses a Deep Research agent to draft and revise its own drafts using high-quality retrieved information. This approach achieves new state-of-the-art results in writing long-form research reports and completing complex reasoning tasks.

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