Grok 4.1 Fast just dropped on the API 🔥

Until Dec 3rd:
✦ Grok 4.1 Fast = FREE on OpenRouter
✦All Agent Tools = 100 % FREE

This is the agent model we've all been waiting for:
✦ Tool calling: #1 on Berkeley leaderboard
✦ Real-world: 100% on τ²-bench Telecom
✦ Context: 2M… pic.twitter.com/6NaxAokE4M— TΞTSUØ (tetsuoai) November 19, 2025 https://x.com/tetsuoai/sta...