SebastianOur terms, in plain words.
Last updated 7 November 2026
“A gentleman's agreement, written down.”
These terms are between you and Leonard Haasbroek, Fargo, North Dakota, USA (“we”), the maker of Sebastian. By buying, installing or using Sebastian you agree to them.
Buying
- Sebastian is sold through Polar, our online reseller and merchant of record. Polar's checkout terms also apply to the payment.
- The Founder Edition is a one-time payment of $49 (plus any tax Polar adds), limited to 100 copies. It includes Sebastian 1.0 and every 1.x update we release. Version 2.0 and any future subscription are not included, though founders will be offered a discount.
- You can have a full refund within 14 days. See Refunds.
Your licence
- We give you a personal licence to install and use Sebastian on up to 2 computers you own or control, with your founder key. You can move him to a new computer by freeing up an old one.
- Please don't share or resell your key, copy Sebastian for others, or try to get around the key check.
- Sebastian includes parts made by others under their own licences. They're listed in the third-party notices that come with him, and those licences apply to those parts.
What you need
A Windows 10 or 11 PC with a strong graphics card and about 6 GB free, and an internet connection to install him. To think, he uses an AI provider you choose: either your own key with a cloud provider such as Anthropic (Claude), which that provider charges you for separately, or a free local model. Check the requirements before buying; if he can't run on your PC, ask for a refund.
What Sebastian is, and isn't
- Sebastian is an AI. He can be wrong, even when he sounds sure and even after he's checked his sources. Check anything important yourself. He is not a doctor, lawyer, financial adviser or emergency service.
- He asks before he sends, buys, deletes or installs anything. You're responsible for what you approve him to do, and for using him lawfully, including Tor mode.
- News, search results, 3D models and other content he brings you come from third parties. We don't control them.
Updates
When a new version is ready, Sebastian offers it to you; he never updates quietly. Every update is signed by us, and he refuses anything that isn't. We may change or remove features in updates.
The legal part
- Sebastian is provided “as is”. As far as the law allows, we don't promise he'll be free of mistakes or interruptions, or suitable for any particular purpose.
- As far as the law allows, we aren't liable for indirect or consequential losses, and our total liability to you is limited to what you paid for Sebastian.
- Nothing here limits rights you have under consumer law where you live.
- These terms are governed by the laws of North Dakota, USA.
- If we change these terms, we'll update the date at the top. Changes won't take away what you've already paid for.