Grok 4.6 replaces Grok 4.5 on the Pro tier

Grok 4.6 is now the Grok option on the Pro quality tier, in place of Grok 4.5. xAI prices the two identically and calls 4.6 "the most intelligent and fastest model we've built" - and in our own SVG drawing benchmark the difference is visible: where 4.5 famously spent 668 tokens barely attempting the task, 4.6 actually engages with it.

If you had Grok 4.5 selected on a chat, it keeps working and stays on that chat - nothing you pinned has moved. It is simply no longer offered in the picker for new selections.