OpenAI says its models solved one of math's hardest problems as researchers cry foul

US tech giant OpenAI on Tuesday said it had solved one of the hardest problems in mathematics with an unreleased artificial intelligence model after just 88 hours – and millions of dollars' worth of computing power. But a US mathematician and a researcher at rival Anthropic allege that OpenAI only took up the problem after it had gotten wind of their own AI-assisted efforts to crack the challenge which had demanded months to craft a radically distinctive approach.