OpenAI has agreed to buy Windsurf, an artificial intelligence-assisted coding tool formerly known as Codeium, for about $3 billion, according to people familiar with the matter, marking the ChatGPT maker’s largest acquisition to date.

Windsurf, formally called Exafunction Inc., had recently been in talks with investors including Kleiner Perkins and General Catalyst to raise funding at a $3 billion valuation. The company was valued at $1.25 billion in a deal led by General Catalyst last year.