Sierra, the customer service AI startup co-founded by Bret Taylor, revealed on Thursday that it has acquired Fragment, a Y Combinator-backed French startup specializing in helping companies embed AI into their workflows. This marks Sierra’s third publicly announced acquisition. Earlier this year, in late March, it acquired Opera Tech, a Japan-based enterprise AI solutions company, as well as Receptive AI, a voice agent startup.

Fragment co-founders Olivier Moindrot and Guillaume Genthial will be joining Sierra’s team. In a blog post, Taylor and his co-founder, Clay Bavor, noted that Moindrot and Genthial will bring “valuable strength” to Sierra’s “agent development efforts in France.” The financial terms of the deal were not disclosed, though PitchBook estimates that Fragment raised approximately $2 million during its seed round.

Taylor, who also serves as chairman of OpenAI’s board, co-founded Sierra alongside former Google executive Bavor after stepping down as co-CEO of Salesforce in early 2023. The startup counts Casper, Clear, and Brex among its customers and has raised over $630 million in funding to date from investors including Sequoia and Benchmark, giving it a valuation of $10 billion.