Value-oriented shoppers often place two titans in the warehouse club category — Sam’s Club and Costco — at the top of the heap when it comes to scoring great deals on household essentials.
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As part of a broader quest to figure out exactly which of these two competitors offered the most savings to consumers, we turned to ChatGPT (the most recent version, ChatGPT 5.2) to settle the matter. Here’s what OpenAI’s popular tool had to say.
ChatGPT’s Live Price Comparison Using Instacart Listings
First, ChatGPT conducted a live comparison between Costco and Sam’s Club prices via the Instacart platform. Although there’s one caveat — Instacart pricing doesn’t always reflect in-store pricing — the AI model still ended up noting that Sam’s Club offered the better value across several household essentials.
“Sam’s wins because it’s cheaper in more of the high-frequency staples, and it meaningfully undercuts Costco on at least one major household consumable (paper towels) in same-day price snapshots,” ChatGPT noted, also comparing the price of eggs, milk, coffee, beef, olive oil, and butter — with Costco only taking down a win on the latter item.
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Several Other Studies Reinforce ChatGPT’s Reasoning: Sam’s Club Is Generally Cheaper Than Costco
ChatGPT quickly pivoted to cite several other reputable pricing experiments from various publications, with all of these shoring up its claim that Sam’s Club often beat Costco when it comes to overall basket price.
The most recent of these was issued by AllRecipes writer Emily Hunt. Comparing store brand products on a per-unit price basis, Hunt recorded costs for bacon, butter, chicken breast, coffee, eggs, ground beef, maple syrup, milk, olive oil, and ground beef. The result: Sam’s Club took first place, Costco came in a close second, and BJ’s rested third on the podium.
In a January report on the same three warehouse clubs just mentioned, The Penny Hoarder ended up concluding that Sam’s Club membership offered the best value proposition, including “the cheapest membership fees, cheapest grocery prices and the most opportunities for additional savings with its advanced membership plan.”
ChatGPT also gestured toward a 2023 AARP report — as well as a 2021 Club Intelligence Center datasheet — that both backed Sam’s Club has having the cheaper grocery inventory.
Editor’s note: Prices are accurate as of Mar. 26, 2026. Prices and availability may vary by location.
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This article originally appeared on GOBankingRates.com: I Asked ChatGPT Which Store Is Better for Savings: Sam’s Club vs. Costco
