Cannes Lions 2026: The shift from AI hype to measurable ROI

The 'ROI on the Riviera' theme signals that the era of speculative AI spending has ended. For the streaming and ad-tech ecosystem, this means a shift away from 'AI-washing' toward interoperable platforms that can prove audience growth and revenue impact. Agencies are evolving into 'agentic operating systems,' but their move to acquire neutral data players like LiveRamp raises significant questions about platform neutrality. To remain competitive, streaming providers must ensure their first-party data signals are robust enough to feed these emerging automated orchestration engines. Watch for whether Publicis maintains LiveRamp’s interoperable status or if competitors pivot to independent alternatives like Permutive to avoid platform lock-in.

The push for tangible AI returns coincides with a massive capital expenditure cycle. Per valueaddvc.com (May 2026), combined AI-attributable capex across the 'Big 4' tech giants reached $370 billion in 2025, a 2.6x year-over-year acceleration. This infrastructure race has placed immense pressure on agency holding companies to prove their internal tools can deliver efficient results. WPP, for instance, is currently executing its 'Elevate28' strategy to stabilize the business following an 8.1% revenue decline in 2025, emphasizing its WPP Open platform as a core driver for future organic growth (per WPP, February 2026).

Market forecasts suggest that while the 'gold rush' continues, the focus is narrowing on search and retail media. WPP Media’s midyear 2026 forecast projected that AI-powered search advertising will capture nearly 40% of all search revenue by 2031, despite currently accounting for less than 2% of the market (per Digiday, June 2026). This shift toward 'agentic search' and automated commerce is a primary reason for the industry's obsession with orchestration; as AI chatbots become alternative platforms for consumer attention, agencies must be able to traffic campaigns through non-traditional, conversational interfaces.

Furthermore, the 2026 festival's formalization of 'AI Craft' as a subcategory across Design, Digital, and Film Lions indicates that the industry is establishing mature benchmarks for quality. Gartner reports that global AI spending is projected to hit $2.59 trillion in 2026, but the firm notes that the 'improved predictability of ROI' must precede true enterprise scale (per Gartner, January 2026). Consequently, the winners at Cannes are increasingly those who can demonstrate that data and AI were foundational to the creative concept rather than mere supporting elements added during the production phase.