> ## Documentation Index > Fetch the complete documentation index at: https://docs.siray.ai/llms.txt > Use this file to discover all available pages before exploring further. # Grok 4 > xAI's Grok 4 is their most advanced LLM, utilizing axiom-based first-principles reasoning for superior performance in complex logic, advanced coding, and multimodal tasks. ### Model Use Cases Their most advanced LLM. It uses axiom-based first-principles reasoning for superior performance in complex logic, advanced coding, and multimodal tasks, setting a new benchmark. ### Key Features * **First-Principles:** Excels by building solutions from core axioms, minimizing logical errors. * **SOTA Reasoning:** Highly competitive on advanced reasoning benchmarks like GPQA and HMMT. * **Multimodal:** Capable of processing and reasoning over both text and visual inputs effectively.