ChatGPT 5.4 Cut Per-Answer Citations From 19 Domains to 15
OpenAI switched ChatGPT Search to GPT-5.4 on March 4, 2026, replacing the text-command web.run tool with a JSON-based interface. RESONEO co-founder Olivier de Segonzac tracked 400 daily prompts for 14 weeks and found average unique domains cited per response dropped from 19 to 15, a 21% decline. AEO