Burger King claps back at McDonald's with its own ChatGPT ad after the chatbot calls the Big Mac the most iconic burger

• Two billboards from Burger King and McDonald's have been placed next to each other in Brazil.
• The ads feature answers written by ChatGPT and have a similar design, per The Drum.

Two competing billboards from Burger King and McDonald's have been placed next to each other in Brazil.

According to translated versions of the billboards reported by The Drum, the chatbot calls McDonald's Big Mac the most "iconic burger" and names Burger King's Whopper "the biggest." The ads both feature answers written by ChatGPT and have a similar design.

Burger King's billboard appears to be a response to McDonald's launching a wider campaign based on the chatbot's answer.

The fast-food company asked OpenAI's chatbot what the most iconic burger in the world was and it named the Big Mac the "most globally recognized." The Big Mac was introduced in 1967 and even has its own index.

The Burger King ad seems to follow McDonald's directly, asking: "And which is the biggest?" According to the advert, The Whopper is the biggest in terms of size and amount of ingredients.

When Insider asked ChatGPT which was the most iconic burger in the world, it listed the Big Mac, the Whopper, and the In-N-Out Burger in that order.

Both ads have a similar look, featuring lines of colored text to look like a burger. It is unclear if the ads are always placed next to each other or how many are featured in Brazil.

Representatives for McDonald's Brazil did not provide the ad or comment when contacted by Insider. Burger King did not immediately respond to Insider's request for comment, made outside normal working hours.