Walnut vs Mezzi: Which Is Better in 2026?

Figures and features are point-in-time and change; treat the table as a starting map, not a live quote.

The AI that knows your portfolio. Ask anything in plain English, research any stock or fund, and get an honest second opinion, on the broker you already use. Read-only by default, you approve every trade, and it never holds your money. Walnut is not an investment adviser.

How it works: You connect the brokerage you already use through a secure, read-only link, so your login stays with your broker and Walnut sees positions rather than credentials. You then analyze and manage that portfolio by talking through Claude or ChatGPT, and you can group holdings into thematic baskets built around a thesis. When you decide to act, Walnut prepares the trades and routes them back to your own broker for you to approve.

In practice, Walnut’s AI conversational + thematic baskets + trade. It falls under chat-driven management of your own brokerage, which makes it best suited to talking to your own brokerage with ai. On connecting an account it is “Yes (your own broker)”, and on execution it is “Read + you approve”. It is priced as free tier.

One honest limitation: It sits on top of your broker rather than being a broker itself, so you connect an existing account.

Aggregates your accounts and layers AI insights with a tax-aware lens. Best for a consolidated view across holdings.

How it works: Mezzi aggregates your investment accounts into one view and layers AI insights over them with a tax-aware lens, flagging things like potential wash sales, fee drag, and unrealized-gain considerations across accounts. It is read-only: it tells you what it sees and what to consider, and you act at your broker.

In practice, Mezzi’s AI aggregates accounts + tax-aware insights. It falls under chat-driven management of your own brokerage, which makes it best suited to aggregated wealth tracking with ai. On connecting an account it is “Yes”, and on execution it is “Read”. It is priced as subscription.

One honest limitation: Tracking-and-insight focused rather than thesis-driven basket building.

The honest framing: Mezzi is about its own take on AI-assisted portfolio management, while Walnut is about thematic baskets plus the option to chat through Claude or ChatGPT and place trades you approve. Mezzi is a close peer that also connects your accounts; the difference is mainly focus.

Every tool gives something up for what it does well. Here is the honest give-and-take on each, so you can weigh the specific strengths against the limitations that come with them rather than judging on the headline category alone.

For AI investing tools, the distinction that matters most is whether the tool works from your actual, connected positions or reasons from something else: a separate account it manages for you, or the tickers and numbers you feed it. It decides how personal the answers can be, and where your money physically lives.

• Walnut: reads your real connected holdings. Walnut connects your real brokerage (Yes (your own broker)) and works from your actual positions, so its answers reflect what you genuinely own rather than a generic model.
• Mezzi: reads your real connected holdings. Mezzi connects your real brokerage (Yes) and works from your actual positions, so its answers reflect what you genuinely own rather than a generic model.

On this specific question the two land on the same side, so the deciding factors between them are elsewhere: category, cost, and who each is built for. This holdings-aware angle is the one Walnut is built around: it connects the brokerage you already use and reasons from your live positions, read-only by default, with any trades left for you to approve.

There is no universal winner here; the right pick depends on the job you are hiring the tool for. Match the category to your intent rather than chasing a single “best.”

• Choose Walnut if you want talking to your own brokerage with ai. Its AI conversational + thematic baskets + trade, it is priced as free tier, and it fits chat-driven management of your own brokerage. It is built for hands-on investors who want an AI layer on the broker they already have, without moving their money. Keep in mind that it sits on top of your broker rather than being a broker itself, so you connect an existing account.
• Choose Mezzi if you want aggregated wealth tracking with ai. Its AI aggregates accounts + tax-aware insights, it is priced as subscription, and it fits chat-driven management of your own brokerage. It is built for multi-account investors who want tax-aware tracking and insights consolidated in one place. Keep in mind that tracking-and-insight focused rather than thesis-driven basket building.

Because both sit in the same category, the choice comes down to the finer details above rather than a fundamental difference in approach.

Cost is easy to misread when two tools charge in different shapes, so compare the model, not just the number. Walnut is priced as free tier, while Mezzi is priced as subscription. A percentage-of-assets fee scales with your balance, a flat subscription does not, and a “free” tier usually earns elsewhere (on cash, order flow, or premium upgrades), so the cheapest headline is not always the cheapest outcome for your situation.

Pricing and tiers change often. Confirm the current numbers on each provider’s own site before you decide; the framing above is point-in-time.