Zimbabwean writer Simbarashe Kundizeza has denied using artificial intelligence (AI) to write his short story, which won this year’s Caine Prize for African Writing.

His statement comes a week after he scooped the £10,000 ($13,000) award and a recent article in The Atlantic said AI-detection software Pangram had shown his work about a boy whose family falls on hard times was entirely AI generated.

“For the avoidance of doubt, I wrote The Blue Fighter,” he posted on X, external.

The accusation has caused an uproar on social media and Caine Prize chair Ellah Wakatama told the BBC she was shocked that the US magazine had not waited for a full investigation before publishing.

“I do wish The Atlantic had spent more time investigating this so that alongside Pangram, they did have evidence of real human investigation of it before tainting the prize and tainting this winner,” Wakatama told the BBC’s Front Row programme.

The chair of the Caine Prize’s board of trustees said she had been contacted on Friday about the allegation and Vauhini Vara’s article – Yet Another Prizewinner Seems to Be AI, external – had been published on Sunday.

It follows rows over other literary prizes this year, in particular the Commonwealth Short Story Prize, which was won by Trinidadian writer Jamir Nazir despite allegations that he had used AI, and the withdrawal of Canadian Haitian author Thélyson Orélien from France’s top literary award, the Goncourt, over allegations he used AI for his first novel, which he denies.