Grok Bot hit a CAPTCHA, asked for one click, then found the best price
A Coca-Cola price check across Belgian supermarkets, with no shops or sizes named. Grok Bot went to each store's own site, flagged a Carrefour block, and after one human click found the best price per liter there.
Done withGrok BotSpotted· by Peter van Hees· Oct 20, 2026
Result Revised its own price ranking without being asked
“Carrefour opened. Two liters at 2,95 euro, which worked out to 1,48 per liter and quietly became the best price per liter of the whole exercise, beating the Aldi two-liter it had ranked first a few minutes earlier.”
Spotted: found in the wild. Details are as reported by the source above and have not been independently verified.
What they did
They asked Grok Bot, in plain language, to compare the price of a bottle of Coca-Cola across the major Belgian supermarkets, find the cheapest and most expensive, and flag any promotions running that day, without naming which shops, sizes, or where to look. The bot chose to read each retailer’s own site instead of a price comparison blog.
How it went
It reported matching prices at two chains and a cent higher at a third, noted which stores didn’t sell that size, and worked out the per-liter cost of the running promotions. When Carrefour blocked it with a human check, it said so and asked for a click instead of guessing, then found a price that beat everything it had ranked before. Their caveat: a bot reading retail sites can still misread them, so they wouldn’t publish the prices as fact.
Try it yourself with Grok Bot
Ask [agent] to compare the price of [a product] across [a category of stores near you], without naming the specific stores or sizes, and have it tell you the cheapest and most expensive option plus any current promotions. Tell it to check each retailer's own site rather than a comparison blog, and to ask for your help instead of guessing if a site blocks it with a CAPTCHA or login check.
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