Mini toolsGrok 4 Heavy
By xAI
Model family: Grok
Grok 4 Heavy is the top configuration of xAI’s Grok 4 family, built for the hardest reasoning, coding, and analysis workloads. The Grok 4 platform provides native tool use and real-time search integration, plus a 256,000-token context window for long documents and multi-file workflows across text and vision. Heavy delivers the strongest performance in the lineup with elevated rate limits, and it’s offered to SuperGrok Heavy subscribers as well as through the xAI API (with Premium+ and SuperGrok access to Grok 4 generally). Choose Heavy when you need maximum capability and throughput on complex tasks
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Overview
Grok 4 Heavy is xAI’s most powerful Grok 4 variant—frontier-level reasoning with native tool use, real-time search, a 256K-token context window, and higher rate limits. It’s available via the SuperGrok Heavy tier and the xAI API.
About xAI
xAI is an artificial intelligence startup founded by Elon Musk, aiming to understand the universe.
Industry:
Artificial Intelligence
Company Size:
1200
Location:
Palo Alto, California, US
Website:
x.ai
Benchmark scores
How Grok 4 Heavy ranks on tracked AI benchmarks. Click any benchmark to see its full leaderboard.
Compare across all benchmarks →Tools using Grok 4 Heavy
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Grok — v4.5Handles difficult long-running tasks more effectively by investigating problems, using tools, recovering from mistakes, and verifying results in realistic environments. Extends beyond software engineering into data science, finance, legal work, and other computer-based knowledge tasks with a broader training mix. Improves agent-style computer work through training on large volumes of codebase interactions and developer-agent behavior with software tools. Gains stronger robustness on hard problems through reinforcement learning environments designed specifically to remain challenging even for frontier systems. Offers a separate fast variant, indicating a higher-speed option alongside the main weight class for lower-latency workflows.
Last updated: April 6, 2026
