Grok AI Portfolio: Tops S&P 500 by 53% in 2026 Test

Grok leads AI models in the Rallies AI Stock Market Arena with a 66% return since late November, ahead of ChatGPT at 63%, Claude at 26% and Gemini at 22%, all beating the S&P 500's 13% gain while Deepseek managed just 4% and Qwen fell 28%. The Grok portfolio ranks sixth among over 200 human-run portfolios on Autopilot over three months, and the ChatGPT version draws more than $22 million in investments. Historical performance of AI-driven vs human-managed investment portfolios vs S&P 500 shows early edges for robo-advisors and algorithmic trading track record in beating market benchmarks, with each model favoring distinct holdings like Micron for Grok and Google for ChatGPT.