PANews reported on November 20th that xAI announced the release of its next-generation model, Grok 4.1 Fast, along with the simultaneous launch of its Agent Tools API. Grok 4.1 Fast features a 2 million token context window, is optimized for real-world applications such as customer support and in-depth research, and supports tool calls, code execution, and web browsing. It has been trained through long-term reinforcement learning in multiple domain environments. The model is now available through the xAI API, priced at $0.2 per million token input and $0.5 per million token output, and will be available for free trial on the OpenRouter platform for the next two weeks.