Use AI assistants privately | Staying Safe Online

Start with the uncomfortable position. You cannot use a mainstream AI assistant completely anonymously. The realistic goal is pseudonymity: reducing what the provider can link back to you. And the thing that most often identifies people is not the signup. It is what they type. A carefully separated account still exposes you if your prompts contain personal details, or if your writing is distinctive enough to correlate with your other accounts.

There is a second surprise. For the major assistants, the hardest obstacle is usually not the email address or the payment method. It is phone verification. Several providers require an SMS code at signup, reject numbers from internet telephony services, and re-verify when you sign in from an unfamiliar device or over a VPN. A private email address and a masked card do not clear that hurdle.

That leaves three realistic approaches. Choose by how much of the product you actually need. This guide is a companion to Browse the web anonymously.

Path A: Privacy proxies

The easiest option, and the right one for most people. A third party strips your identifying information before the query reaches the model, so you have no account, no phone number, no payment record and no address trail with the model provider.

DuckDuckGo AI Chat lets you use models from several providers with no account. DuckDuckGo acts as an anonymising proxy, removing your address and identifying headers before forwarding the prompt, and has agreements with the providers restricting how those conversations are used. A paid subscription adds access to larger models through the same layer.
Brave Leo is built into the Brave browser and needs no account for its free tier. The model provider sees your prompt but not your address.

What you give up. These are stripped-back chat interfaces. You do not get file uploads, saved projects, or the provider’s full application. If you want the underlying model, this works. If you want the whole product, it does not.

To harden it further, use the proxy over a VPN so even the proxy does not see your real address.

Path B: Local models

Run an open-weight model on your own computer. Nothing leaves your device: no proxy, no provider, no logs, no account. This is the only genuinely private option.

What you give up. You do not get the specific commercial models, and you need capable hardware, usually a modern graphics card or a recent Apple-silicon machine with enough memory. For sensitive research where nothing should reach a third party, it is the right answer despite the trade-offs.

Path C: A pseudonymous first-party account

If you genuinely need the full application, you have to create an account, and this is the difficult path.

The phone requirement. Where SMS verification is mandatory and internet telephony numbers are rejected, the only robust answer is a real mobile SIM that is not registered to you, bought with cash. Whether that is possible depends entirely on where you are, because many countries now require identity documents to register a SIM. Third-party services that receive verification codes on your behalf exist, but they see your codes, their numbers are reused and frequently blocked, and you are trusting an unknown operator. They are not recommended.

The rest of the setup:

Email. A privacy-focused mailbox created over Tor, with no recovery detail that leads back to you. See Set up anonymous email and payments.
Network. A reputable VPN is more likely to succeed than Tor. These services sit behind anti-abuse layers that challenge or block Tor exit nodes, so maximum network anonymity actually increases friction and the risk of being blocked at signup.
Payment. Often unnecessary, because free tiers are capable. If you need a paid tier, use a masked or prepaid card, accepting that the payment ties your sessions together into one profile.

The honest ceiling. Even done carefully, this is pseudonymous rather than anonymous. The provider still holds your phone number, which is a strong identifier, your address unless it is perfectly masked, any payment details, and everything you type, retained according to its policy. Working around verification may also breach the provider’s terms and risk the account being closed. Weigh that before relying on the account for anything important.

The layer that defeats all three

This matters more than any of the arrangements above.

Personal details in prompts. Names, locations, employers and specific facts about your life identify you regardless of how carefully the account was created.
Writing style. Distinctive phrasing can correlate a supposedly anonymous session with your identified accounts.
Cross-contamination. Do not use a pseudonymous assistant for tasks that reference your real identity, and do not sign in to it alongside your real accounts in the same session.

Treat the conversation itself as part of your threat model, not just the login.

Which path fits

You want a capable model, privately. Path A, over a VPN. This is the cleanest option for most people.
Nothing may reach a third party. Path B, a local model.
You need the full application and will work for it. Path C, with every caveat above and no illusion that it is true anonymity.

Staying within the terms

Using these tools pseudonymously for private, lawful work is a reasonable privacy goal. Circumventing anti-abuse verification can breach a provider’s terms. This guide describes the landscape so you can make an informed choice; it is not a licence to break agreements you have accepted or to evade a suspension.

Sources and further reading

Signup requirements, model line-ups and free-tier features change constantly, and this guide deliberately avoids naming specific model versions for that reason. Check the current verification rules, tier contents and retention policy on each provider’s own pages before relying on any specific detail.