Mistral gates on activation rather than on a deposit: activate the account - free mode counts - then create the key and paste it into Big-AGI.
Mistral Supported Models ->A new Mistral account has to be activated before its key does anything. The quickstart names a free activation mode next to the paid one, so a first answer is reachable with no payment method on file.
Paid activation adds a payment method; free mode does not. Mistral's terms differ between the two modes - read them before sending anything you care about. The account is European, and the key hangs off it. The enforceable limit is the billing and limits area inside console.mistral.ai.
Press Ctrl + Shift + M for Models, then More Services if the Setup AI Models wizard is showing. Add -> Mistral, paste into Mistral Key, press Models, and the fetched list appears under the panel (add and manage your keys).
Direct Connection can be turned on once the key is in the browser. It starts off.
Direct Connection works only with your API key stored in the browser, and with an AI service that permits direct browser calls (CORS). Where it cannot be used, requests route through the Big-AGI fast edge servers instead - everything still works, within the standard upload size and time limits.
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