It was (is?) free with eg. opencode -- so, open-source coding agent + free sota model, it's hard to resist. That said, grok fast is fast, but not that great when compared to the other top tier models.
It's a 1.7 trillion token free model. Why wouldn't you try it?
I've been testing free models for coding hobby projects after I burnt through way too many expensive tokens on Replit and Claude. Grok wasn't great, kept getting into loops for me. I had better results using KAT coder on opencode (also free).
Kilo Code lets people use Grok Code Fast 1 for free, using OpenRouter as the provider. And Grok 4.1 Fast was completely free directly on OpenRouter for some time after its release.
So yeah, their statistics are inflated quite a bit, since most of that usage was not paid for, or at least not by the end user.
I've mostly stopped using Claude because of it, it will still try use Python for the most random tasks. It recently wrote an HTML file with some inline js in it, then started a local python server to open the HTML file, and check the log output.
This is in a node.js project. It is just too obsessed with using Python, and it seems to help it focus and make more sensible choices by removing the option.
What's really missing here is the mode where you plug the iPhone into a monitor, connect keyboard and mouse, and suddenly it's a functional desktop-lite in the same way that a basic iPad now is.
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