December 9th brought some interesting shifts in the AI model landscape.

Grok 4.1 Fast has been making waves lately - not just as another model release, but as what they're calling their most capable agentic system yet. The tool-calling performance? Pretty solid. What's catching attention is how it's translating into actual usage numbers.

Currently sitting at the top spot on OpenRouter's leaderboard when you look at token throughput. That's not just theoretical capability - it's real-world adoption at scale. The volume metrics are telling a story about what happens when you nail the balance between agent-ready architecture and practical utility.

For anyone tracking AI infrastructure trends, this is one of those data points worth noting. High-volume sustained usage usually means the model found its use case fit.