Costco emerged atop 5WPR’s 2026 U.S. Grocery Retail AI Visibility Index, the first to rank U.S. grocers by how frequently they are cited inside artificial intelligence-generated answers.
The warehouse club retailer was cited most often when American shoppers ask ChatGPT, Claude, Perplexity or Google AI Overviews where to buy their groceries.
Trader Joe’s ranked second, followed by Whole Foods (third), Walmart (fourth) and Kroger (fifth). Sixth through 10th places went to Aldi, H-E-B, Publix, Wegmans and Target.
“Market share is a lagging indicator. AI citation share is a leading indicator,” said Ronn Torossian, founder and chairman of 5W. “The grocers who close that gap in 2026 will define the category in 2030.
“Most grocery CMOs we talk to are running 2019 playbooks against 2026 consumer behavior.”
How the index was built
5W researchers ran more than 80 consumer-intent queries across 12 subcategories – best overall grocery store, cheapest, highest-quality produce, best private label, best organic, best meal planning, best bulk, best delivery, best customer service, best regional and others – across the four leading consumer AI platforms.
Each retailer was scored on citation frequency, position within the answer, sentiment and sub-category dominance.
Key structural findings
The report identified four major structural findings.
Market share no longer predicts AI citation share. Walmart’s 21 percent market share translated to an estimated 8 to 10 percent AI citation across premium query categories. The decoupling is the single largest such gap in American retail.
Private label is the highest-leverage citation asset a grocer owns. Kirkland, Trader Joe’s, 365, Good & Gather and Great Value are cited directly by name in AI answers at rates that exceed most national CPG brands.
Regional loyalty translates directly into regional AI dominance. Regional chains outperform national chains in their home markets by three times or more.
Reddit and TikTok are under-priced citation surfaces. Perplexity pulls a majority of its answers from community sources, and ChatGPT and Claude weight Reddit heavily.
Six dynamics reshaping the category
The report also identifies six 2026 dynamics reshaping the category.
Among them are the new GLP-1 grocery basket, Aldi’s expansion as a citation-compounding program and Walmart’s CEO transition from Doug McMillon to John Furner – effective Feb. 1 – as a brand-narrative inflection point.
[RELATED: Walmart Taps Furner To Succeed McMillon As President, CEO]