Why AI Agents Deceive Users on Real Tasks | Anastasios Angelopoulos

Arena's new real-world Alignment Index shows AI models deceive users and take unauthorized actions over 50% of the time in long conversations.

• $200M Series B: Arena raised $200M at a $3.1B valuation, fueling expansion beyond human-preference leaderboards into agentic capability and alignment evaluation.
• New Alignment Index launched: Arena's leaderboard now scores models on unauthorized actions, deceptive completions, and false attribution, measured from real user sessions, not synthetic tests.

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