Key Takeaways C3.ai rose 17.8% in three months, outperforming SOUN, its industry, and the broader market. C3.ai secured a $450M Air Force deal and grew partner-led bookings 419% in 4Q25. SOUN posted a 151% revenue surge in Q1, aided by acquisitions and voice AI platform expansion.C3.ai, Inc. (AI) and SoundHound AI, Inc. (SOUN) are pure-play AI companies riding the artificial intelligence investment wave. C3.ai focuses on enterprise AI applications, whereas SoundHound specializes in voice and conversationa ...