Elon Musk announced on August 2 via social media platform X that Grok, the model developed by his AI company xAI, can now analyze any video. To demonstrate, Musk posted a lifelike AI-generated video of late basketball legend Kobe Bryant, who died in 2020, pitching Grok 4.5 and signing off with "Mamba Out." Grok’s analysis report stated: "This is an AI-generated deepfake video. Kobe Bryant passed away in 2020, so the entire video is completely synthetic." Grok inferred the video was likely produced by xAI’s Grok Imagine Video 1.5, citing that the 63-second runtime far exceeds typical text-to-video limits and likely used a hybrid workflow of multi-segment stitching with "image reference + text prompt + lip-sync." Skeptics noted Grok may rely on subtitles or audio transcription rather than frame-by-frame visual rendering; one user tested an 11-minute video and found transcription errors or fabricated details. Our publication tested Grok on a video about the Collatz conjecture (3n+1 problem), unproven for nearly a century, with mathematician Terence Tao making a breakthrough in 2019. Grok accurately interpreted the core math and analyzed the animation’s logic, including a reverse tree with 1 as the root node and the "all positive integers eventually enter the 4→2→1 loop" structure. Grok also analyzed a