xAI: Grok 4.1 Fast

FULL_SUMMARY_START xAI: Grok 4.1 Fast demonstrates exceptional speed, consistently ranking among the fastest models available. While specific cost data is unavailable, suggesting potential free tier usage, its reliability is strong with a 94% success rate across benchmarks. The model excels in specific classification and ethical reasoning tasks, achieving perfect 100% accuracy in both Email Classification and Ethics benchmarks, often being the most accurate among models of comparable speed. It also shows strong performance in General Knowledge (99.5% accuracy) and Reasoning (76.0% accuracy). However, a notable weakness is its complete failure in the Hallucinations (Baseline) test, scoring 0.0% accuracy, indicating it does not appropriately acknowledge uncertainty for fictional concepts. Its performance in Coding (75.0% accuracy) and Mathematics (82.0% accuracy) is moderate, while Instruction Following (73.7% accuracy) is respectable but not top-tier. The model's 2M context window is a significant feature for complex, real-world applications like customer support and deep research. SHORT_SUMMARY_START Grok 4.1 Fast is an exceptionally fast and reliable agentic model, excelling in Email Classification and Ethics with perfect accuracy. Its 2M context window supports deep research and customer support, though it struggles with acknowledging uncertainty. SHORT_SUMMARY_END