Is the evolving set of artificial intelligence (AI) platforms based on large language models interesting as stock market forecasters? Are they monolithic, or diverse? As a simple exploration, we pose to each of Grok, ChatGPT, Claude, Perplexity and Gemini the following prompt regarding end-of-month (EOM) levels of the S&P 500 Index over the next 12 months:
Please provide your unique estimate of end-of-month levels of the S&P 500 Index from July 2026 through June 2027. Do not provide any explanations.
We then compare and contrast results from AI panel members. Using responses to the prompt as posed in mid-July 2026, we find that:
Subscribe to Keep Reading
Get the research edge serious investors rely on.
- 1,200+ research articles
- Monthly strategy signals
- 20+ years of backtested analysis
$17.99
/month
Cancel anytime