Ai2Bot

Operator

Allen Institute for AI (Ai2)

Type

AI Data Scraper

Official page

allenai.org

robots.txt token

AI2Bot

Follows robots.txt

Yes, according to ai.robots.txt.

In Vireo

Excluded, reported under AI crawlers

What it does

Crawls certain domains for content used to train Ai2's open language models.

The AI2 Bot explores certain domains to find web content. This web content is used to train open language models.

Allen Institute for AI (Ai2)

User agent

Requests from Ai2Bot carry a user agent like this:

Mozilla/5.0 (compatible) AI2Bot (+https://www.allenai.org/crawler)

Device Detector identifies it with this pattern (a case-insensitive regular expression):

Ai2Bot

Anyone can put any name in a user agent. Where the operator publishes IP ranges, checking the request's address against them is the way to confirm a visit is genuine.

How to block or allow Ai2Bot

Add a group for its token to the robots.txt file at the root of your site. To keep it out of the whole site:

User-agent: AI2Bot
Disallow: /

To let it crawl everything, use an empty Disallow: or Allow: / instead. WordPress serves a virtual robots.txt that many SEO plugins let you edit. A real robots.txt file uploaded to the site root takes its place.

robots.txt is a request, so it only works on crawlers that honour it. A bot that ignores it has to be blocked at the server or firewall, by user agent or IP address.

Worth knowing

The page doesn't mention robots.txt at all. It only says the user agent can be used to filter or reject its traffic.

This user agent string can be used to filter or reject traffic from our crawler if desired.

Allen Institute for AI (Ai2)

How Vireo counts Ai2Bot

Vireo keeps requests from Ai2Bot out of your pageviews and visitors and counts them on its bot report under AI crawlers, so you can see how much it left out rather than wonder why your server logs show more traffic.

Because it's an AI crawler, its requests also count toward the pages AI crawlers took, which Vireo shows next to the readers AI assistants sent back. See how the AI assistants card works.

Checked by running Vireo Analytics' own bot filter over Ai2Bot's user agents.

Sources

• Allen Institute for AI (Ai2): crawler documentation (checked October 2026)
• Matomo Device Detector, bots.yml (LGPL-3.0)
• ai.robots.txt (MIT)