Grok 4.1 Fast and Agent Tools API
Grok 4.1 Fast, a 2M-context tool-calling model at $0.20/$0.50, ships with an Agent Tools API for search, code execution and MCP.
xAI hosts web search, X search, code execution, document retrieval and remote MCP tools server-side. Scores 100% on tau2-bench Telecom (Artificial Analysis verified, $105 total cost) and 72% on Berkeley Function Calling v4.
- Date
- Wednesday, 19 November 2025
- Lab
- xAI
- Kind
- model
- Access
- closed API
- Price
- $0.20 in / $0.50 out per 1M tokens; tools $5 per 1,000 calls, Nov 2025
Figures
| Measure | Value | Measured by |
|---|---|---|
| tau2-bench Telecom | 100% total run cost $105; verified by Artificial Analysis per xAI | third-party |
| Berkeley Function Calling v4 | 72% | company |
Sources
This record was checked against its sources on 6 October 2026. How we check