xAI: Grok 4 Fast

This high-throughput AI supports both "reasoning" and "non-reasoning" modes to balance depth, speed, and cost. It handles complex technical tasks like research summaries, mathematical derivations, and code generation/debugging, while scaling to ultra-long contexts (up to ~2M tokens) for multi-document analysis. Use reasoning mode for multi-step logic; switch to non-reasoning for faster, cheaper responses. Specify mode, output length, and formatting to control latency and costs. While it supports text plus limited visual inputs, it's best for text-heavy workflows. As with any advanced model, verify outputs for accuracy, bias, and safety, and avoid unnecessary repetition in long prompts.