AI search doesn't behave like traditional search, and it doesn't behave the same way across platforms either. To find out how brand content actually performs after distribution, we tracked 245 stories across six AI platforms for the four weeks following their release: Google AI Overviews, Google AI Mode, Claude, Perplexity, Gemini, and ChatGPT. The data showed real differences in how often each platform surfaces brand content, how fast that visibility builds, and whether it holds or fades over time. This report breaks down what we found platform by platform, and what it means for how brands should structure content in 2026.