The AI Search Brief: September 2026
The price tag on the answer layer came into view this month. OpenAI opened self-service ad buying inside ChatGPT, and said its young ad business already runs at a $1 billion annual pace. With more than a billion people using ChatGPT each week, a paid tier now sits beside the earned citations brands have been chasing. Fresh Adobe data shows visitors sent by AI now convert better than the rest of the web. And Anthropic started watermarking everything Claude writes, a step toward telling AI-generated content from the human record it competes with.