The Experiment
Can AI actually manage your money better than you can? We deposited $10,000 into 5 different AI-powered investment platforms on September 1, 2025, and tracked every trade, fee, and return through February 28, 2026. Here are the unfiltered results.
Platform 1: Wealthfront — $10,000 → $11,240 (+12.4%)
The winner. Wealthfront's AI allocated across US stocks, international, bonds, and real estate with automated tax-loss harvesting. The algorithm sold losing positions to offset gains, saving ~$300 in taxes. Low fees (0.25%), smart rebalancing, boring but effective.
Platform 2: Betterment — $10,000 → $11,050 (+10.5%)
Very similar to Wealthfront. Slightly different allocation (more international exposure). Tax-loss harvesting slightly less aggressive. Fees: 0.25%. The difference between Wealthfront and Betterment is negligible — both are excellent.
Platform 3: M1 Finance — $10,000 → $11,180 (+11.8%)
M1 lets you choose "pies" (portfolio templates) that AI helps optimize. We chose the "Aggressive Growth" pie — heavy NVDA, AAPL, MSFT, QQQ. Higher returns than the robo-advisors but more volatile. No advisory fees (they make money on margin lending).
Platform 4: Magnifi (AI Stock Picker) — $10,000 → $10,750 (+7.5%)
Magnifi uses AI to pick individual stocks based on natural language queries. We told it: "Invest in AI companies and defense stocks for the Iran crisis." It bought NVDA, PLTR, LMT, RTX, and GD. The defense stocks helped during geopolitical scares, but PLTR's volatility dragged returns.
Platform 5: ChatGPT Portfolio — $10,000 → $9,850 (-1.5%)
The control group. We asked ChatGPT to build a portfolio and followed its suggestions exactly. It recommended a reasonable mix but couldn't adapt to market conditions (no real-time data). By month 3, several positions had moved against us and ChatGPT's "update" recommendations lagged the market by weeks.
Lesson: ChatGPT is a research tool, not a portfolio manager.
The Comparison
| Platform | Return | Max Drawdown | Fees | Best For |
|---|---|---|---|---|
| Wealthfront | +12.4% | -5.2% | 0.25% | Set-and-forget investors |
| Betterment | +10.5% | -4.8% | 0.25% | Goal-based investing |
| M1 Finance | +11.8% | -7.1% | 0% | DIY investors who want AI assist |
| Magnifi | +7.5% | -9.3% | $6.99/mo | Thematic/sector investors |
| ChatGPT | -1.5% | -12.1% | $20/mo | Research only (don't trade this) |
Key Takeaways
- Purpose-built AI investing platforms (Wealthfront, Betterment) beat general AI (ChatGPT) by a wide margin
- Tax-loss harvesting alone added 1-2% in after-tax returns
- The best AI platforms are boring — they diversify, rebalance, and optimize taxes. No moonshots.
- For active trading, AI tools assist humans — they don't replace the human decision maker
- SPY returned +9.8% over the same period. Only 3 of 5 platforms beat the simple index.
The Verdict
If you have less than $100K: Wealthfront or Betterment. If you want control: M1 Finance. If you're a trader: use AI tools (OptionStrat, TradingView, ChatGPT for research) but make your own decisions. The worst approach: blindly following AI trade suggestions.
