tech
December 17, 2025
Grok 4
Grok 4 is the most intelligent model in the world. It includes native tool use and real-time search integration, and is available now to SuperGrok and Premium+ subscribers, as well as through the xAI API. We are also introducing a new SuperGrok Heavy tier with access to Grok 4 Heavy - the most powerful version of Grok 4.
TL;DR
- Grok 4 is now available to SuperGrok and Premium+ subscribers, featuring native tool use and real-time search.
- A new SuperGrok Heavy tier provides access to Grok 4 Heavy, the most powerful version of Grok 4.
- Grok 4 was trained using reinforcement learning on a 200,000 GPU cluster, improving its reasoning abilities.
- Innovations in infrastructure and algorithms increased training compute efficiency by 6x.
- Training data was significantly expanded beyond math and coding to include more domains.
- Grok 4 can utilize tools like code interpreters and web browsing to augment its reasoning.
- Grok 4 Heavy is the first model to score 50% on Humanity's Last Exam.
- The Grok 4 API offers multimodal understanding, a 256,000 context window, and integrates live data search.
- Upgraded Voice Mode features enhanced realism and responsiveness, with Grok able to analyze video input during chats.
- xAI plans to continue scaling reinforcement learning and improving multimodal capabilities for future AI development.
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