comments Elon Musk's xAI today announced Grok 4, its latest flagship multimodal AI model. xAI claims that Grok 4 is a top-tier AI model with state-of-the-art performance in academic, mathematical, and reasoning benchmarks. The Grok 4 Heavy version, with multi-agent tools, delivers even more impressive gains in popular AI benchmarks. Academic and Reasoning Benchmarks: Humanity’s Last Exam (HLE): Grok 4 (no tools) achieved 25.4%, outperforming Google’s Gemini 2.5 Pro (21.6%) and OpenAI’s o3-high (21%). Grok 4 Heavy (multi-agent + tools) reached 44.4%, compared to Gemini 2.5 Pro with tools at 26.9%. ARC-AGI-2: Grok 4 scored 16.2%, nearly double the next-highest model (Claude Opus 4). MMLU-style evaluations: Achieved a 0.866 score (86.6%) on MMLU with an overall Intelligence Index of 73, leading the industry. STEM & Coding Benchmarks: