Arena vs a2z Radiology AI
Side-by-side comparison of AI visibility scores, market position, and capabilities
Raised $150M Series A at a $1.7B valuation in January 2026, just four months after commercial launch, with 5M+ monthly users across 150 countries and $30M annualized enterprise AI evaluation revenue.
About
Arena (formerly LMArena/Chatbot Arena) is the world's most widely used crowdsourced AI model evaluation platform, originated by UC Berkeley researchers and spun into an independent company in 2025. Millions of users submit prompts to blind head-to-head model comparisons and vote on quality, generating the most trusted public LLM leaderboard. Arena has commercialized this community signal into an enterprise AI Evaluations service and Max — an AI model router powered by real-world preference votes.
a2z Radiology AI raised $20M in 2025 for its whole-body AI that simultaneously screens for 24+ conditions across CT scans — from incidental cancers to cardiovascular risk — in a single automated read.
About
a2z Radiology AI has developed a whole-body CT analysis platform that simultaneously screens for over 24 medical conditions across a single CT scan, including incidental cancers, coronary artery disease, aortic aneurysm, bone density loss, and organ abnormalities. The AI acts as a second reader that radiologists can use to catch incidental findings that fall outside the primary reason for a scan — a major source of missed diagnoses.
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