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🔎 Best free AI for research

Limits checked against each vendor's own pricing page.

Best free pick

Gemini

$0/month with a Google Account

Upgrade when: Google AI Plus is $4.99/month (2x Free usage); Google AI Pro is $19.99/month (4x Free usage). US college students can get AI Pro free for a year.

Checked 2026-10-16

All free options

Tool	What's free	When to upgrade	Deals
ChatGPT checked 2026-10-16	Unlimited text chats with GPT-6 (subject to abuse guardrails) Limited messages with uploads Limited image creation	Upgrade to Go or Plus when you keep hitting upload, image or deep-research limits. US college students: check the free 4-month Plus offer first.	1 live
Claude checked 2026-10-16	$0, free for everyone Chat on web, desktop and mobile Search the web, create files, and run code	Pro is $20/month billed monthly ($17/month billed annually) and adds more usage plus Claude Code. Upgrade when you hit the free usage cap mid-task.	1 live
Gemini checked 2026-10-16	$0/month with a Google Account Access to the Flash-Lite model Image generation and editing	Google AI Plus is $4.99/month (2x Free usage); Google AI Pro is $19.99/month (4x Free usage). US college students can get AI Pro free for a year.	1 live
Gemini Notebook (formerly NotebookLM) checked 2026-10-16	Standard limits for chat and generation of Slides, Audio Overviews and other artifacts Access to Google's Gemini models Up to 50 sources per notebook	AI Plus doubles limits (100 sources/notebook); AI Pro gives 4x limits (300 sources/notebook). Upgrade when you hit the 50-source cap.	—
Grok checked 2026-10-16	Free to try on the web and in the apps Modes for search, reasoning, voice and imagery	SuperGrok adds higher limits and multi-agent reasoning.	—