Live demo — bring your own key

A minimal chat with the tutor, running entirely in your browser against your own OpenAI-compatible API endpoint (that is any AI provider whose chat API uses the same request format as OpenAI's). There is no server behind this page: the key never leaves your browser except in the request to the provider you choose.

Before you paste a key:

Use a restricted key with a spending limit. This page has no rate limiting and no cost cap — your key, your quota.
The key is kept in memory only (a JavaScript variable). It is never saved to localStorage, cookies, or logs, and closing the tab erases it.
The key is sent only to the base URL you enter below, directly from your browser. There is no proxy in between.
Your provider must allow direct browser (CORS) calls. Some providers block browser requests or require an opt-in header; if requests fail with a network/CORS error, that is usually why. Check your provider's browser/CORS policy.
Do not paste a production or broadly-scoped key. Do not share personal information in the chat.

1. Connect a model

No key connected. The chat is disabled until you connect a key — nothing is sent anywhere until then.

2. Practice

No key? See the example transcripts — the no-key way to see how the tutor behaves (pending real evaluation runs). Connect a key above to start. The tutor uses the v3 draft system prompt from the specification at temperature 0 (a provider setting that keeps replies steady and repeatable — it has nothing to do with how hard the math is), expecting to help with linear equations like 3x + 5 = 20 after you have had a lesson on them.

Two things this tutor will not do: it will not hand over answers before you have genuinely attempted the problem (that is the whole point), and it does not need any personal information — please don't share any.

What this page does and does not store

Stored: nothing. No localStorage, no cookies, no analytics, no server. Reloading the page clears everything, including your key and the conversation.
Sent: two things. Your messages and the conversation so far go to the API base URL you entered, with your key in the authorization header. Nothing else, nowhere else.
Logged: nothing. The page never writes your key or messages to the browser console.