Deep Research: depth over breadth.
Deep Research is ChatGPT's long-running research mode. Where the Agent acts — clicking and filling forms — Deep Research thinks: it pulls from dozens of sources, synthesizes, and returns a cited report that reads like an analyst's work. As of February 2026 it can also connect to MCP servers and restrict its search to trusted sites.
Acts vs. thinks.
Takes actions in a browser — buys, books, fills forms. Breadth of doing.
Reads and synthesizes dozens of sources into one cited report. Depth of understanding.
Two things make a Deep Research run good: a tightly framed question with sub-questions, and control over which sources it's allowed to trust. You'll do the second one now — it's the feature most people don't know exists.
Trusted-site mode: vet the sources.
You're researching a medical treatment — the kind of question where a bad source is worse than no source. Deep Research lets you restrict its inputs. Trust the credible sources; Skip the ones that don't belong in a clinical answer.
Chat, Agent, or Deep Research?
Three modes, three jobs. Match each task to the right one.
Where Deep Research earns its runtime.
Industry analysis with sources
A research question → a 2,500–3,500 word cited report with a "what to watch" section. Frame it with explicit sub-questions, not a vague topic.
Trusted-site mode
Restrict inputs to a curated allowlist (PubMed, NIH, Cochrane, major medical centers) for medical, legal, or financial research where source quality is everything.
MCP-enabled internal research
Connect Salesforce, Notion, Slack, or a database via MCP so it blends your own lost-deal notes and intel docs with public sources. Use read-only credentials.
Deep Research produces analyst-grade drafts, not verdicts:
- Trusted-site mode constrains inputs, not authority — it can still misread a good source. High-stakes calls need expert review.
- Runs take 10–30+ minutes — kick it off and walk away; don't watch it.
- Fact-check before you ship — treat it as a strong first draft.
Run one Deep Research task this week
Pick a topic you'd normally Google for an hour and synthesize in your head. Frame it as a Deep Research prompt with specific sub-questions (and a source allowlist if it's high-stakes). Set it running and walk away. What you come back to is the kind of work an analyst would bill for.
What you can do now
- Frame queries with specific sub-questions, not vague topics
- Build a trusted-source allowlist for high-stakes research
- Connect MCP servers for hybrid internal + external research (read-only)
- Expect 10–30 minute runtimes — don't watch it work
- Treat output as a strong draft that still needs fact-check and expert review