Efficiency Overhead: CMOs Lean Into AI, Shrink Agency Spend

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With marketing budgets stalled at 7.7% of revenue, CMOs are leaning into AI to cut costs—putting agencies under mounting pressure in 2025.

CMOs enter 2025 with little financial breathing room. Marketing budgets remain locked at 7.7% of company revenue, unchanged from last year, according to Gartner’s latest C-suite survey. The real threat, however, may be what’s not yet visible: mid-year cuts amid ongoing economic uncertainty.

Rather than expecting more, marketers are stretching the same dollars further—accelerating the shift toward in-house capabilities and automation. Generative AI, once a curiosity, has become central to this strategy. From campaign ideation to content production, AI is helping brands do more with less, especially as scrutiny over ROI sharpens.

Paid media remains the largest expenditure, consuming over 30% of CMO budgets. Yet spending is recalibrating elsewhere. Agencies — long standing partners in brand-building—are increasingly viewed as expendable. Many CMOs are trimming agency relationships or renegotiating scopes, citing speed, flexibility, and cost as driving factors.

For agencies already grappling with margin pressure, the trend portends a tough year. In-house teams empowered by AI are not only leaner but often faster to execute. “There’s less patience for overhead,” notes one senior marketer at a multinational CPG brand. “The pressure is on to deliver value, not decks.”

The paradox is clear: while the marketing mandate grows—more channels, more personalization, more data—the means to fulfil it remain static. Whether this breeds greater innovation or accelerates burnout will depend on how effectively brands rebalance capability, cost, and creativity.