grok-4-1-fast-non-reasoning

Grok 4.1 Fast is xAI’s flagship tool-call model, launched on November 19, 2025. Paired with the Agent Tools API, it is primarily designed to deliver powerful long-context reasoning in an efficient and cost-effective manner.

• Outstanding Performance: It excels in benchmark tests such as τ² - bench Telecom and Berkeley Function Calling v4, demonstrating stable multi-turn long-context performance and halving the hallucination rate.
• Powerful Capabilities: With a 2-million-token context window and integrated with the Agent Tools API, it enables parallel invocation of multiple tools without requiring developers to manage infrastructure.
• Cost-Effective: It boasts high tool-call accuracy and low inference costs, making it more cost-efficient than competitors in research-oriented scenarios.

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Core Capabilities

📊 Precise Testing: Achieves 72% accuracy in the Berkeley Function Calling v4 benchmark and leads in the τ² - bench Telecom score, showcasing its exceptional strength.

💪 Long-Text Processing: With a 2-million-token context window, it delivers high accuracy in multi-turn long-context tasks, effortlessly handling complex task planning.

🛠️ Rich Tool Ecosystem: The Agent Tools API provides a wide range of tools, supporting real-time search, file retrieval, code execution, and more—just a few lines of code are all it takes to get started.

💰 Low Costs: In research-oriented scenarios, its average cost is lower, and the unit price for cached input tokens is highly affordable.