Tool

ChatGPT

OpenAI's general AI assistant with web search, deep research, file analysis and image tools.

Free tier

Yes

Starting price

$8/mo

Pricing

$8/mo is ChatGPT Go; Plus is $20/mo with expanded deep research.

Updated

17 Oct 2026

Open tool

• assistant
• research
• writing
• documents

Picked for

• Which AI tool should I use to chat with my PDFs and documents? Rank 3
• Which AI tool should I use to research a topic with sources? Rank 2

Sources

• chatgpt.com — pricing
• help.openai.com — 10500283 deep research in chatgpt