It started off as an improvised test for longer context windows I think Anthropic/Claud did some early on but Greg Kamradt seems to have got it established as a

It started off as an improvised test for longer context windows I think Anthropic/Claud did some early on but Greg Kamradt seems to have got it established as a benchmark [1]. Basically they hide a phrase (in this Gemini case it was text flashed on the screen) at various points in a document and then compare performance across LLMs by retrieval accuracy as the size of the document increases. [1] https://x.com/GregKamradt/status/1758149501188210932 https://x.com/GregKamradt/status/1758149501188210932