低成本叫板GPT-5.1！马斯克杀入智能体

Core Insights - xAI has launched two major updates for its xAI API: Grok 4.1 Fast and Agent Tools API, focusing on fast, low-cost, and agent-centric models [2][5] - Grok 4.1 Fast is the best-performing tool invocation model to date, supporting a context window of 2 million tokens, excelling in customer support and financial applications [2][8] - The model has improved its ranking in the Artificial Intelligence Index (AII) to sixth place and achieved a top score of 93.3% in the τ²-bench Telecom ranking, outperforming models like GPT-5.1 and Gemini 3 Pro [2][7] Pricing Structure - The pricing for Grok 4.1 Fast is set at $0.20 per million tokens for input, $0.05 for cached input, and $0.50 for output tokens, while the Agent Tools API starts at $5 for 1,000 successful calls [5][6] - Users can experience the services for free for two weeks until December 3 [5][29] Performance and Features - Grok 4.1 Fast has shown significant improvements in real-time information retrieval compared to its predecessor, Grok 4 Fast, but has underperformed in classic programming tasks [11][15] - The model has been trained using reinforcement learning in simulated environments, enhancing its tool invocation capabilities while maintaining cost-effectiveness [7][8] - The Agent Tools API allows developers to create autonomous agents capable of web browsing, searching X posts, executing code, and retrieving documents with minimal coding effort [20][22] Competitive Edge - Grok 4.1 Fast has set a new standard in factual accuracy, reducing hallucination rates by half compared to Grok 4 Fast, while maintaining competitive performance in the FactScore evaluation [25][27] - xAI's focus on integrating real-time data and deep research capabilities positions it favorably in the evolving AI landscape, emphasizing practical applications [30]