Grok 4 Heavy

2025-07-09 · Publisher : xAI · Domain : Artificial Intelligence

xAI introduces Grok 4 Heavy, the most powerful version of Grok 4 based on parallel compute at inference time, available through the new SuperGrok Heavy subscription.

xAI introduces Grok 4 Heavy, the most powerful version of Grok 4 based on parallel compute at inference time, available through the new SuperGrok Heavy subscription. ### What changes - Grok 4 Heavy explores several hypotheses in parallel (several agents compare their results), according to xAI. - First model to reach 50% on Humanity's Last Exam, according to xAI (50.7% on the text subset). - Reserved for the new SuperGrok Heavy tier, priced at $300 per month (TechCrunch). - A processing time of around ten minutes is illustrated in the post. ### Specifications - Based on Grok 4 (see the Grok 4 entry): same reinforcement training on Colossus. - Availability: apps (SuperGrok Heavy); no separate API identifier published in the post. - Context, maximum output and knowledge cutoff: not disclosed for Heavy. ### Pricing SuperGrok Heavy subscription at $300 per month (press source). No API pricing published for Heavy at launch. ### Benchmarks Scores published by the vendor. | Benchmark | Grok 4 Heavy | |---|---| | Humanity's Last Exam (text, Python and Internet tools) | 50.7% | | USAMO 2025 | 61.9% | ### Key takeaways Heavy targets difficult reasoning problems, at the cost of an expensive subscription and long compute times, with no API access at launch.

Tags : LLM, xAI, Grok, Grok 4, Heavy, Raisonnement