AI startup Glean has successfully raised $200 million in a Series D funding round led by Kleiner Perkins & Lightspeed Venture Partners, reaching a valuation of $2.2 billion, up from $1 billion. The funding round attracted major investors, including Citigroup, after Glean's revenue quadrupled. Glean aims to challenge ChatGPT in the enterprise sector by enabling Chief Information Officers (CIOs) to deploy AI quickly and securely, enhancing the productivity of knowledge workers. The company plans to use the funds for a hiring spree. Glean's technology focuses on connecting Large Language Models (LLMs) with enterprise data in a scalable and secure manner, leveraging its advanced retrieval engine. Arvind Jain, CEO of Glean, highlighted the transformative potential of generative AI in increasing productivity and efficiencies when applied correctly.