From the source

Grok 4.1 Fast and Agent Tools API

API release

xAI announces Grok 4.1 Fast and Agent Tools API, bringing next-generation tool-calling agents to the xAI API.

From the source
Grok 4.1 Fast and Agent Tools API Bringing the next generation of tool-calling agents to the xAI API Nov 19, 2025
x.ai

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