News — 2026-09-21

OpenAI's ChatGPT uses an ad collector to track user activity across websites, connecting browsing behavior to individual ChatGPT accounts. The mechanism involves setting a cookie called __obi, which is sent to OpenAI from websites that have installed the company's ad code. Read more

SpaceXAI has launched the early public beta of Grok Bot, a digital work assistant that can perform tasks on behalf of users across various tools and platforms. The beta is available to paid subscribers of specific SpaceXAI and Cursor plans, allowing them to automate tasks and workflows with the help of AI. Read more

Backpropagation, a crucial algorithm in training neural networks, has a counterintuitive backward pass. Understanding why this is necessary can strengthen one's grasp of the algorithm. It all comes down to efficiently computing gradients in a directed computational graph. Read more