“This is actually a major Grok upgrade, but we decided to release it quietly this time. Gave us time to smooth out the rough edges. [@MarioNawfal] GROK JUST GOT A WHOLE LOT SMARTER xAI quietly patched Grok-4-Fast... and the before/after is wild. “Reasoning” mode jumped from 77.5% to 94.1% complete responses. “Non-reasoning”? Up to a staggering 97.9%. All thanks to one thing: better injected system prompts. No press”