Grok 4 Fast Review: xAI’s Reasoning Powerhouse vs GPT-5 & Claude (Performance Deep Dive)

Choosing the right large language model (LLM) is a critical decision for developers and businesses. With the market offering a vast array of models, each promising a different blend of intelligence, speed, and cost, making an informed choice requires clear, unbiased data. This analysis provides a comprehensive examination of xAI’s Grok 4 Fast, situating its performance within the broader landscape of contemporary models like GPT-5, Claude 4.1 Opus, Gemini 2.5, and various open-weight alternatives, using data from rigorous independent evaluations. How Do We Measure “Intelligence” in AI Models? To compare models objectively, we rely on standardized benchmarks that test a …