Elon Musk has stepped up his ongoing feud with ChatGPT-maker OpenAI with a revived lawsuit against the firm, adding Microsoft as a defendant. Mr Musk, a co-founder of the artificial intelligence (AI) company, accused it and the tech giant of operating a monopoly in an amended legal complaint on Thursday.

Elon Musk has filed an amended complaint against OpenAI, accusing the company — and its close partner, Microsoft — of anticompetitive dealings.

Elon Musk, an original co-founder of OpenAI, attempted to steer the organization away from becoming too cozy with Microsoft when it was negotiating an early cloud computing deal with the Redmond company.