Executives from OMD US, Horizon Media, and Chalice.AI discussed the operational shift of AI in performance marketing at the Cannes Lions festival. The panel emphasized that while agentic AI is increasingly automating campaign execution and measurement, human oversight remains essential for defining business outcomes and validating data.
The transition to agentic systems allows agencies to move beyond basic automation toward self-acting bidding engines that optimize for actual revenue. This shift directly challenges the current attribution models where individual platforms often claim redundant credit for the same consumer purchase, creating a discrepancy between platform data and CFO-validated sales growth. As these tools become standard, the competitive advantage will shift from who uses AI to who best defines the business outcomes the models are trained to achieve. Watch for the emergence of agent-to-agent marketing protocols as digital assistants begin making purchasing decisions on behalf of consumers.
The industry is rapidly expanding the capabilities of enterprise AI agents to handle complex workflows that were previously manual. Agencies are also exploring AI ad strategist tools to further refine campaign performance.
At Cannes Lions, OMD and Horizon Media executives revealed that agentic AI is shifting from simple automation to driving tangible business outcomes for brands like Hershey’s and Bayer. While AI now manages complex bidding and execution, human oversight remains critical to prevent platforms from over-reporting sales attribution and ensure accurate revenue growth.
Brands like Hershey’s and Bayer are using AI to drive incremental sales and market share rather than focusing solely on click-through rates.
Human oversight is required to prevent individual platforms from over-reporting sales attribution and to ensure AI models are aligned with actual business objectives.
The 80-20 model involves AI managing repeatable data analysis and execution tasks, while humans define the final business objectives and strategy.
Chalice.AI provides an AI-driven measurement platform that helps agencies reconcile platform attribution claims against actual sales lift data.
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