Step 1: Understand Each Platform's Auction Mechanics
Different AI ad platforms use different auction models. Perplexity uses CPM/CPC hybrid; Google AI Mode uses CPC auction extending existing Google Ads bidding; ChatGPT uses partnership flat-fee (no auction). The strategy varies materially by platform; treating them all as Google-style CPC auctions misses major mechanics.
Step 2: Set Target CPA Per Platform
Compute target cost-per-acquisition by platform based on the platform's expected conversion rate and contribution margin. Perplexity typically delivers higher conversion rates per click (qualified traffic); Google AI Mode delivers higher volume at slightly lower per-click conversion. Target CPA should differ accordingly.
Step 3: Choose Automated or Manual Bidding
Google AI Mode supports automated bidding (Maximize Conversions, Target CPA, Target ROAS) extending from traditional Google Ads. Automated bidding generally outperforms manual for high-volume campaigns. Perplexity offers more limited automation; manual bidding with periodic adjustment is the typical pattern. ChatGPT has no bidding (partnership model).
Step 4: Bid Higher Where Organic Visibility Is Strong
The 2.3x conversion lift from paid-plus-organic compounding means bids should be higher on prompts where the brand has strong organic presence. The economics work: higher conversion rate justifies higher CPC. Brands bidding flat across all prompts miss the opportunity to capture extra value where organic foundation supports it.
Step 5: Use Intent Category Targeting Carefully
Google AI Mode intent categories are broader than traditional keywords. A category like "find alternatives to [category]" can encompass dozens of underlying user queries with varying intent. Monitor category performance closely; pause categories that produce volume without conversion and bid up categories that convert above target.
Step 6: Adjust for Platform-Specific Patterns
Perplexity prompts that contain "best" or "top" tend to have higher commercial intent and justify higher bids. Google AI Mode multi-modal queries (image + text) often produce different conversion patterns than text-only queries; bid separately if the platform allows. ChatGPT partnership pricing requires negotiation rather than bidding, with annual commitment usually producing better unit economics than monthly.
Step 7: Run Periodic Bidding Audits
Quarterly: review bid efficiency by platform, by intent category, by prompt cluster. Brands set bids once and forget them; the AI ad platforms evolve fast and bid efficiency drifts. Audit cadence is the operational discipline that maintains efficient AI ad spend.
How Presenc AI Helps
Presenc AI provides organic visibility data by prompt and platform. The data feeds bidding decisions: bid higher on prompts with strong organic foundation, bid lower or pause prompts with weak foundation. Brands using prompt-level organic data to inform bids see materially better paid-AI ROI than brands bidding flat across the prompt universe.