ChatGPT

OpenAI's assistant.

Free tier: Yes
Starting paid: Go $8/mo; Plus $20/mo; Pro from $100/mo (price taken from search results citing the official page; not confirmed on the live page)
Checked 2026-10-24 · pricing source · prices change, confirm on the official site

Our take (editorial): Free plan, a cheap Go tier and the widest tool set (images, voice, deep research, Codex).