AI comparison: ChatGPT, Claude, Grok, Gemini adding complex single file feature [video]

In this presentation, July 26 2025, ChatGPT, Claude, Grok, and Gemini were asked to add a requested feature to an existing single-file application. ChatGPT, and Claude broke the application, whereas Grok and Gemini succeeded at adding the feature.

Gemini's completed version is available here: http://taonexus.com/chess-with-fen.html