ChatGPT (OpenAI) · sub-product

Deep Research

Good enough when you are already in ChatGPT; Perplexity Deep Research is sharper.

Consilix rank 7/10

What it is

The long-form research mode that runs for up to 30 minutes, fans out web searches, reads sources, and writes a multi-thousand-word cited report. Lives inside ChatGPT now rather than as a separate product.

Key features

Up to 30-minute multi-source research run
Cited output with linked sources
Strong on structured comparisons and market scans
Can be combined with uploaded files for grounding
Now backed by GPT-5.5 reasoning

Best use cases

UK market sizing for a new service line with sources
Competitor landscape sweep for a sales pitch
Regulatory map for a sector you are entering
Long-read explainer of a complex tax or compliance change
Vendor due diligence pack from public filings and press

Weaknesses

Perplexity Deep Research is faster (two to four minutes) and arguably more honest about its citations. ChatGPT Deep Research sometimes pads with filler. Accuracy benchmarks put it behind Claude Code and Parallel Ultra on hard factual recall.

Pricing

Plus, Pro, Team, Enterprise. Limited monthly usage on Plus, generous on Pro.

ChatGPT (OpenAI)