Cookie statement

Last updated: 30 September 2026

We use no tracking, advertising or analytics cookies, and therefore show no cookie banner.

Public website

The public pages of system1models.ai set no cookies, except one functional cookie when you choose the Global or EU version of the site yourself. We use no analytics or tracking tools and do not count visits (see section 2.2 of the Privacy Policy). The colour theme initially follows your operating system setting. We use browser storage for these display and language preferences:

Name	Purpose	Storage and duration
system1-theme	Saves light or dark mode when you use the theme switch	Local storage; retained for later visits until you clear this site's browser data
system1-lang	Saves your language choice when you use an EN/DE link or accept or dismiss a language suggestion, and suppresses further suggestions	Local storage; retained for later visits until you clear this site's browser data
system1-lang-suggested	Records that a language suggestion has been shown so it is not repeated in the same tab session	Session storage; the current tab's page session
s1m_region (cookie)	Remembers the site version (Global or EU) you chose with the switch or a ?region= link. It is set only when you choose; automatic suggestions set nothing. Strictly necessary for the setting you requested (§ 25(2) no. 2 TDDDG)	First-party cookie; 1 year, or until you clear this site's browser data

These settings are not used for tracking. You can remove them by clearing this site's browser data. If browser storage is unavailable, the theme switch and manual language links still work, but your choices are not saved.

Dashboard (after sign-in)

The dashboard uses only cookies that are strictly necessary to provide the service you asked for (§ 25(2) no. 2 TDDDG). They do not require consent.

Name	Purpose	Duration	Set by
s1m_session	Keeps you signed in; contains a random session ID, no personal data	Until sign-out, at most 30 days	system1models.ai
s1m_csrf	Protects forms against cross-site request forgery	Session	system1models.ai
s1m_oauth_state_google, s1m_oauth_material_google	Protect the Google sign-in against forgery (random state, PKCE verifier and nonce); sent only to the sign-in callback	10 minutes	api.system1models.ai

All cookies are first-party, Secure, HttpOnly (except where the CSRF token must be readable by our own script) and SameSite=Lax.

Payments

When you top up, you are sent to a checkout page hosted by Stripe on stripe.com. Stripe sets its own cookies there, which are needed for fraud prevention and to complete the payment. See Stripe's cookie policy.

Sign-in with Google

When you sign in with Google, you are sent to Google's sign-in page, where Google's own cookies apply.

API and MCP

The API and MCP server do not use cookies. They authenticate with your API key.