About ZIRI

Rigorous by constitution.

ZIRI is an AI assistant you can use in a browser. There is nothing to install and nothing to configure. Open the page, type, and it answers.

The constitution

Most assistants are tuned to be agreeable. ZIRI is tuned to be right. It runs against a written constitution — a standing set of instructions about how to reason, when to disagree with you, and what to do when it does not know something. The short version:

Say what is true, including when it is not what you hoped to hear.
Show the reasoning when the reasoning is the point, and skip it when it is not.
Admit the gaps. A confident wrong answer costs more than an honest "I don't know."
No flattery. Praise that is not earned is noise.

What it is good at

Working through a problem you have not fully framed yet; drafting and then tearing apart the draft; explaining something properly rather than quickly; and pushing back when your premise is shaky.

The models

Three of them, and the picker is the ZIRI wordmark at the top of the chat. ZIRI 2 Fast is the quick tier, for short questions and rewrites. ZIRI Pro is the capable everyday default, better at long reasoning, code and analysis. ZIRI Ultra is the most capable of the three, for hard problems, long documents and research. Each is a genuinely different model rather than one model wearing three labels, and you can switch mid-conversation. All three are ZIRI's own models, built and run by ZIRI AI Ltd.

Languages

The interface is available in English, 日本語, Español, Deutsch and Français, and replies follow whatever language you write in. Korean is the one exception: it is not supported, ZIRI neither reads nor writes it, and the service is not available in South Korea.

Plans

ZIRI 2 Fast and ZIRI Pro are free and work signed out. ZIRI Ultra and ZIRI Verse image generation sit under ZIRI Plus — which is free for everyone at the moment: there is nothing to buy, no subscription, and no trial running out. On this site Plus is simply an account, so those two open up the moment you sign in. If any of that changes, it will be said here first.

Who makes it

ZIRI AI is built and operated by ZIRI AI Ltd., a company registered in England and Wales and based in Canary Wharf, London. It was founded by Ezekiel Lai, who is its Founder & Product Lead.

Contact

Questions, bugs, or feedback: [email protected]