Anysphere, creator of the fast-growing programming tool Cursor, has closed a new round of funding that more than triples its valuation to about $9bn, as money continues to pour into Silicon Valley’s hottest artificial intelligence start-ups.

OpenAI backer Thrive Capital led a $900mn round for San Francisco-based Anysphere, according to people familiar with the deal. Andreessen Horowitz and Accel are among the other investors who participated.

Anysphere was founded in 2022 by a quartet of twenty-somethings who met studying maths and computer science at the Massachusetts Institute of Technology. It was previously valued at $2.5bn in January when it raised $105mn, also from Thrive and Andreessen Horowitz.