xAI Launches Grok 4 and Grok 4 Heavy

Grok 4 and Grok 4 Heavy are the latest AI models released by xAI, the company founded by Elon Musk. Launched in July 2025, these models are built to compete with the best AI systems from OpenAI and Google. Grok 4 is available through X (formerly Twitter), while Grok 4 Heavy is a premium-tier version with added features for advanced users. In this article, you’ll learn how the two models differ, what they offer, and who should consider using them.

What Is Grok 4?

Grok 4 is xAI’s most advanced base model to date. It accepts both text and image inputs and supports live web search. It has been integrated into the X platform and is also accessible via API. One standout feature is Eve, a voice assistant with a British accent and emotional tone support.

Grok 4 is designed for general users. It can generate content, answer questions, solve basic problems, and interact with users using voice or text.

What Is Grok 4 Heavy?

Grok 4 Heavy, also known as SuperGrok, is a more powerful version built for professionals, developers, and advanced AI workflows. It introduces a multi-agent system, allowing different components of the model to work together on complex problems. It also gives early access to experimental features and tools.

This version is priced at $300 per month, making it a premium product aimed at users with high-performance or enterprise-level needs.

Key Capabilities of Both Models

Grok 4 and Grok 4 Heavy are both multimodal, meaning they can process text and images. They also include xAI’s real-time search feature called DeepSearch, which uses live internet access and social signals from X.

Eve, the built-in voice assistant, is available in both versions and can handle emotional responses, making conversations feel more natural.

There is also a coding-focused variant called Grok 4 Code. It helps developers write, debug, and understand code more efficiently.

Performance in Benchmarks

To measure their capabilities, Grok models were tested across standard AI benchmarks. These included reasoning tests, academic questions, and logic puzzles.

Grok 4 scored 25.4 percent on Humanity’s Last Exam (HLE), a high-level reasoning benchmark. Grok 4 Heavy reached 44.4 percent when using external tools. It also performed well in ARC-AGI-2 puzzle challenges, scoring 16.2 percent — significantly higher than comparable models.

These results show that Grok 4 Heavy performs well on tasks that require deep thinking and multi-step reasoning.

How Grok Models Compare to Leading Alternatives

To understand where Grok stands, here’s a side-by-side comparison with other well-known AI models. This includes support for search, coding, voice, and agent capabilities.

Grok 4 vs Other Leading AI Models

Model	Multimodal Input	Live Web Search	Coding Support	Multi-Agent Reasoning	Voice Assistant
Grok 4	Yes	Yes	Yes	No	Yes
Grok 4 Heavy	Yes	Yes	Yes	Yes	Yes
GPT-4	Limited	No	Yes	No	No
Gemini 1.5 Ultra	Yes	Limited	Yes	No	No

Use Cases and Applications

Grok 4 is useful for content creators, casual users, and researchers. You can use it to draft text, answer questions, explain documents, or generate summaries. It can also help with images, like analyzing visual data or providing descriptions.

Grok 4 Heavy is better suited for advanced tasks. It supports multi-agent reasoning, which makes it a good option for large-scale automation, technical workflows, or integrating AI into business systems.

Pricing and Access Options

Grok 4 is available to users subscribed to X Premium+. The plan costs about $30 per month and includes access to the model through the X platform.

Grok 4 Heavy is offered as part of the SuperGrok plan at $300 per month. It includes enhanced API access, multi-agent features, and early updates.

Grok 4 vs Grok 4 Heavy 

Feature	Grok 4 (X Premium+)	Grok 4 Heavy (SuperGrok)
Text and image input	Yes	Yes
Voice assistant (Eve)	Yes	Yes
Real-time web search	Yes	Yes
Early access to new features	No	Yes
Multi-agent reasoning	No	Yes
Developer tools & API access	No	Yes

xAI’s Approach to Responsible AI

After facing issues with offensive outputs in earlier models, xAI has improved its moderation systems. With Grok 4, the company introduced new safety filters and updated its handling of sensitive topics.

However, concerns remain. Some users say that Grok’s responses often reflect Elon Musk’s views, especially on controversial issues. xAI has acknowledged these concerns and committed to refining neutrality and transparency.

Who Should Use These Models?

Grok 4 is built for everyday use. If you want an assistant that can handle writing, research, and web browsing, it fits well. It is also helpful for students, content creators, and casual developers.

Grok 4 Heavy is best for professional environments. This includes AI teams, developers, research labs, and businesses that want to build systems powered by multiple AI agents. It offers more control, more speed, and early access to new tools.

If you’re working with AI tools professionally or building career skills around them, consider certifications. The AI Certification helps you understand how to apply AI in real-world systems. For those working in data, the Data Science Certification is a hands-on option. If your goals are more aligned with digital marketing or business growth, the Marketing and Business Certification is worth exploring.

Final Thoughts

Grok 4 and Grok 4 Heavy show that xAI is moving aggressively into the AI race. With strong benchmarks, multi-agent capability, voice interaction, and live web access, these models are competitive with the best in the field.

Grok 4 offers value to the general public through X. Grok 4 Heavy introduces serious features for power users and businesses. If you’re looking for models that mix speed, depth, and flexibility, both Grok versions are worth considering.