Brave Leo: The Privacy-First AI Assistant Built Into Your Browser

Leo is Brave's answer to the question of what an AI assistant looks like when privacy is the starting point rather than a footnote. It lives in the browser's sidebar instead of a separate app or tab, which sounds like a small design decision but changes how you use it: the assistant is already looking at whatever page you are, so summarising an article, interrogating a PDF or pulling the gist out of a Google Sheet is a one-click affair rather than a copy-paste ritual. The free tier needs no account and no login at all, which in 2026 feels almost subversive.

The privacy architecture is the real product here. Queries are proxied so your IP never reaches the model, Brave says it doesn't retain that IP, conversations aren't stored server-side or used for training, and the models are hosted on Brave's own infrastructure rather than farmed out to a third party. Premium subscriptions are verified with credential-based tokens so your payment details sit apart from your chat history. If your objection to mainstream assistants has always been the data trail rather than the output quality, this is the clearest alternative on offer.

It's aimed squarely at people who already run Brave on desktop or mobile and want a capable assistant that doesn't become another account to manage. It is not aimed at power users building workflows — there's no standalone app, no third-party extension, and no persistent memory between sessions.

As a free, zero-friction utility bolted onto a browser you may already use, Leo is excellent and genuinely hard to criticise. Summarisation, drafting, translation and document Q&A all sit where you need them, and Brave Search backs it up for current information. The free model lineup is respectable for something that doesn't even want your email address, though note that our sources disagree on exactly which models are on tap — reports range from Llama 3.1 8B and Claude Haiku 3.5 to Llama 4 and Claude 4.5 Haiku, which suggests the roster shifts faster than anyone can document it. Treat the specific model names as indicative rather than guaranteed.

Premium is where our enthusiasm cools. $14.99 a month (or $149.99 a year) is top-tier pricing for an assistant with no image generation, no plugin ecosystem, no deep Google or Microsoft integration, no memory across sessions, and no life outside the Brave browser. The frontier models on offer are credible but, by the accounts we have, not always the newest available elsewhere for similar money. Even the device allowance is murky: one source says five devices, another says ten. For a subscription at this price, that ambiguity is not a great look, and it's the sort of thing you'd want nailed down before committing to an annual plan.

Our rating reflects that split: a strong free tier and a merely adequate paid one. Other reviewers have landed all over the map on this one — 4.3/5 in one case, 5/10 in another, largely depending on whether they weighted privacy or market clout more heavily. We'd say install it, use the free tier freely, and only reach for Premium if you've genuinely hit the rate limits and the privacy guarantees are worth paying extra for in themselves.