xAI's Grok 4.1 Fast just made waves on December 6th.

This isn't just another model update—we're talking about a beast that's crushing it as an agentic, tool-calling powerhouse. The numbers? Absolutely insane. It's sitting pretty at the top of OpenRouter's leaderboard with a staggering 1.48 trillion tokens processed. Yeah, you read that right. Trillion.

What makes this even more interesting is how it's performing across different metrics. While dominating the overall volume game, Grok 4.1 Fast also secured the top spot on τ²-Bench Telecom benchmarks.

The model's designed for serious agentic work and tool integration, which explains why it's become the go-to choice for developers who need reliable performance at scale. When a model processes that kind of volume while maintaining top-tier benchmark scores, you know something's working.

For anyone tracking the AI infrastructure space, this kind of adoption rate signals real utility. Not hype, just raw usage data speaking for itself.