Massive Reinforcement Learning Scale

July 9, 2025

Grok 4: The Most Intelligent Model in the World
We are thrilled to announce the official release of Grok 4, our most advanced model to date. Grok 4 represents a significant leap forward in frontier intelligence, incorporating native tool use, real-time search integration, and a massive scaling of our reinforcement learning framework.

Key Highlights:

• Native Tool Use: Grok 4 has been trained to autonomously use tools like a code interpreter and web Browse. This allows it to augment its reasoning and provide high-quality, up-to-the-minute answers by finding information from across the web and X.
• Massive Reinforcement Learning Scale: Using our Colossus 200,000 GPU cluster, we scaled reinforcement learning training to an unprecedented level. This refinement process has dramatically enhanced Grok's reasoning abilities, allowing it to solve problems with increased accuracy.
• Benchmark Dominance: Grok 4 sets a new state of the art across numerous expert-level benchmarks.
  Humanity's Last Exam: Grok 4 Heavy is the first model to score over 50% on this deep expert-level benchmark.
  ARC-AGI V2: Grok 4 scored 15.9%, nearly double the previous high.
  Vending-Bench: Grok 4 dominated this agentic benchmark with a net worth of $4,694.15, vastly outperforming competitors.
  Competitive Math & Coding: Grok 4 Heavy achieved a perfect 100% on AIME '25 and scored 61.9% on USAMO '25.

New Versions and Tiers:

• SuperGrok Heavy: We are introducing a new premium tier, which provides exclusive access to Grok 4 Heavy. This parallel agentic model considers multiple hypotheses at once to achieve unparalleled performance and reliability.
• Grok 4 Voice Mode: A completely upgraded Voice Mode is now available, featuring enhanced realism and responsiveness. A new, serene voice and redesigned conversations make interactions more natural.
• Video Integration: In a groundbreaking feature, Grok can now "see what you see." Point your camera during a voice chat, and Grok will provide real-time insights and analysis of your surroundings.

Availability:
Grok 4 is available now to SuperGrok and Premium+ subscribers on the X platform, as well as through the xAI API. The new SuperGrok Heavy tier provides access to the most powerful version of Grok 4.

API for Developers:
The Grok 4 API is now open, offering a 256,000-token context window, advanced multimodal understanding, and real-time data search. It is compatible with OpenAI and Anthropic SDKs and comes with enterprise-grade security certifications.

What's Next:
We will continue to push the boundaries of AI, scaling reinforcement learning even further and expanding our multimodal capabilities to include vision, audio, and beyond. Our goal is to build smarter, faster, and more efficient models that truly understand and assist humanity in profound ways.