Series A · AI
Arena raises $150M Series A at $1.7B valuation
The January financing precedes Arena’s later Series B as the business expands from model-response comparisons into broader AI evaluation.
Arena’s January Series A raised $150 million at a $1.7 billion valuation.
The event belongs to an earlier stage of the company’s funding history than its October Series B. By that later announcement, Arena had expanded into evaluating agent work and introduced an Alignment Index alongside its existing comparisons. The two financings remain separate events, with their respective investor groups recorded in the funding tables.
Funding history
Series A · This round$150M