Artificial intelligence startup Fireworks AI has received a valuation of $552 million in a funding round led by Sequoia Capital. Sequoia, along with investors such as Nvidia, AMD, and MongoDB, invested $52 million in the company in this round of financing, bringing its total cash to $77 million. Fireworks' tools help businesses fine tune and customize models to meet specific needs, allowing them to access over 100 models using their platform.