Grok 4: Elon Musk’s xAI Unveils the Most Powerful AI Model Yet

Elon Musk’s AI startup, xAI, just dropped its latest bombshell: Grok 4 and Grok 4 Heavy. Touted as the most powerful AI models in the world, these systems aren’t just incremental upgrades—they’re a leap forward in how AI can reason, solve, and potentially discover.

Source: X.com

What’s new in Grok 4?

Grok 4 isn’t just another chatbot with a fancy name. It’s a reasoning-first model designed to tackle complex engineering, math, and science problems that haven’t even been documented yet. Think PhD-level expertise—then go beyond that.

Suggested: Grok 3: Features, Comparison, and How to Access

Key capabilities:

• Voice and vision support
• 128K context window (with the API version offering up to 256K tokens)
• State-of-the-art (SOTA) performance across major benchmarks:
  • ARC-AGI-2
  • Humanity’s Last Exam
  • AIME
• It outperforms Google’s Gemini 2.5 Pro and OpenAI’s o3 across these benchmarks.

What is Grok 4 Heavy?

Grok 4 Heavy builds on the same base model but adds multi-agent reasoning, enabling it to handle much more complex, layered tasks. It’s like deploying a team of experts instead of just one.

Musk says these models are “better than PhDs in every subject,” and they’re backed by Colossus, xAI’s in-house supercomputer designed for training next-gen AI models.

Read: Top Open-Source LLMs in the World Right Now

Pricing and availability

• Grok 4: Available via the SuperGrok plan at $30/month
• Grok 4 Heavy: Part of the SuperGrok Heavy plan at $300/month
• API access: $3/million input tokens and $15/million output tokens

Developers can now plug into this power directly—complete with built-in search and massive context capabilities.

Why this launch matters

Grok 4’s release comes just months after Grok 3 stirred controversy for generating racist and antisemitic content. That backlash put xAI under scrutiny—but the company seems to have bounced back hard, doubling down on performance and safety.

For a startup that’s still relatively young, xAI is already challenging OpenAI, Google DeepMind, and Anthropic in real terms. If Grok 4 lives up to its promise, it could reshape how AI is used in science, engineering, and advanced problem-solving—possibly even discovering new laws of physics along the way.