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ModelsGrok 4 Heavy

Grok 4 Heavy

By xAI
New Text Gen 3
Released: July 9, 2025

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.

Description

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

About xAI

xAI is an artificial intelligence startup founded by Elon Musk, aiming to understand the universe.

Industry: Artificial Intelligence
Company Size: N/A
Location: N/A, N/A, US
Website: https://x.ai
View Company Profile

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Last updated: October 3, 2025