xAI quietly dropped a massive update for Grok-4-Fast today.

Use Grok4-Heavy + Grok-4-Fast + Grok-Code-Fast-1 for code. Grok4 is the best model in the world right now.

Reasoning Mode:
Jumped from 77.5% to 94.1% completion rate.

Non-Reasoning Mode:
Jumped from 77.9% to 97.9%.… pic.twitter.com/a6WuTNsezH— tetsuo (tetsuoai) November 8, 2025 https://x.com/tetsuoai/sta...