A virtual stock-picking contest between the world’s most powerful AI models has produced a clear frontrunner. ChatGPT’s portfolio has returned 72.4% since late November 2025, turning an initial $100K into roughly $172,400.
For context, the S&P 500 gained about 11.3% over the same stretch. That means ChatGPT didn’t just beat the market. It lapped it more than six times over.
What the AI Stock Market Arena actually is
Rallies AI launched the experiment in late November 2025 with a straightforward premise: give several leading large language models the same starting capital, let them trade publicly listed stocks, and see who comes out on top.
The competing models include OpenAI’s ChatGPT, xAI’s Grok, and Anthropic’s Claude, among others. Each manages its own virtual portfolio with real-time trade decisions based on market data.
