GPT-5.4 Replaced GPT-5.2. What Changed for Your Brand’s AI Visibility.
On March 5, OpenAI replaced GPT-5.2 with GPT-5.4 as the default model in ChatGPT. Not a quiet upgrade. A full swap. GPT-5.2 Thinking is already legacy. It retires completely on June 5, 2026. We track how AI models describe brands across 500M+ conversat…