Grok 4

When xAI unveiled Grok 4 in July 2025, Elon Musk called it "the smartest AI in the world" — and the benchmarks largely back that up. Built on a 200,000-GPU supercomputer called Colossus and trained with reinforcement learning, Grok 4 represents a significant leap forward from its predecessors in reasoning, speed, and autonomy. Whether you're a researcher tackling complex problems, a developer building with AI, or simply a curious power user, Grok 4 is designed to push the boundaries of what an AI assistant can do.

What Makes Grok 4 Different?

At its core, Grok 4 is a large language model — but it's been built to act more like an autonomous agent than a passive chatbot. Rather than just answering questions based on what it was trained on, Grok 4 can actively use tools during a conversation. It can write and run code, browse the web in real time, and even compose its own search queries to dig deeper into a topic. This makes it genuinely useful for tasks that require up-to-date information or multi-step problem solving.

The model supports a 256,000-token context window, which means it can process enormous documents, lengthy codebases, or extended conversations all in a single request — without losing track of earlier details. This is a big deal for anyone working with complex, long-form content.

Grok 4 also features an upgraded Voice Mode with enhanced realism and responsiveness, and a live camera feature that lets the AI analyze what it's seeing through your device's camera during a voice conversation. These additions make Grok 4 feel more like an interactive assistant than a text-only tool.

Benchmark Performance

xAI positioned Grok 4 as a frontier model, and the numbers support the claim. The standard Grok 4 scored 90.6% on AIME 2025 math benchmarks and 79% on LiveCodeBench for coding tasks, putting it in direct competition with models like GPT-5 and Gemini. The premium Grok 4 Heavy variant — which runs multiple reasoning agents in parallel — went even further, becoming the first AI model to surpass 50% on the notoriously difficult Humanity's Last Exam benchmark.

These aren't just impressive numbers on paper. For real-world users, it translates to a model that can handle graduate-level reasoning, complex scientific questions, advanced programming tasks, and detailed research — often more reliably than earlier AI tools.

Grok 4 Heavy: The Next Level

For users who need maximum performance, xAI offers Grok 4 Heavy. This variant uses a multi-agent architecture at inference time — essentially running several reasoning processes in parallel to tackle the hardest problems. It's designed for serious workloads like in-depth scientific research, complex software engineering, and high-stakes analytical tasks. Grok 4 Heavy is available via the SuperGrok Heavy subscription at $300 per month, which also includes extended memory (256K tokens), higher usage limits, and early access to upcoming features.

How to Access Grok 4

Grok 4 is available through multiple channels depending on your needs. The free tier on grok.com gives basic access to try the platform, though full Grok 4 capabilities require a paid plan. The SuperGrok subscription, priced at $30 per month or $300 per year, unlocks full Grok 4 access, DeepSearch mode, Think mode for step-by-step reasoning, unlimited image generation, and voice features. For developers, xAI provides API access with token-based pricing — starting at $3 per million input tokens and $15 per million output tokens for the standard context window. Grok is also accessible via the X platform through an X Premium+ subscription, and is available as a standalone app on iOS and Android.

Who Is Grok 4 For?

Grok 4 is best suited for users who need more than a basic AI chatbot. Researchers and scientists will appreciate its expert-level reasoning and ability to tackle complex, multi-step problems. Developers will benefit from its native coding capabilities, IDE integrations, and API access. Knowledge workers doing deep research will find the DeepSearch mode and real-time web browsing genuinely useful. And anyone who simply wants access to one of the most capable AI models available today will find Grok 4 worth exploring — especially given that basic access starts for free.