Harvey has closed a new $150 million funding round led by Andreessen Horowitz valuing the San Francisco-based legal AI startup at over $8 billion, according to three sources close to the deal. The three-year-old startup has now raised a total of more than $1 billion, including the new round, outstripping its rivals in terms of valuation and fund raising. But increasingly it's up against a crowded market for legal AI tools.