The progression of Grok AI versions from Grok 3 to Grok 4 and SuperGrok Heavy reflects significant advancements in capabilities, architecture, and performance:
Grok 3 (Released February 2025)
- Introduced web browsing, image and file analysis, and preloaded task modes such as Research, Code, and Analyze.
- Featured a more sarcastic and human-like conversational style.
- Included DeepSearch and Think engines to improve reasoning and accuracy.
- Supported temporary chats for privacy.
- Targeted professionals, power users, and researchers with both free and paid plans.
- Limitations included less depth in specialized areas and pricing not ideal for beginners.
Grok 4 (Released July 2025)
- Considered the most intelligent AI model globally, with native tool use and real-time search integration.
- Utilizes reinforcement learning at pretraining scale on a massive GPU cluster (Colossus with 200,000 GPUs), enhancing reasoning abilities significantly.
- Expanded training data beyond math and coding to many domains, improving versatility and accuracy.
- Supports multimodal input (text, images, speech) and large context windows (up to 256K tokens), enabling complex problem-solving.
- Features multi-agent problem solving and can handle highly complex tasks like writing full programs from diagrams or proving math theorems.
- Outperforms Grok 3 and other leading AI models in benchmarks such as academic tests, coding, and scientific reasoning (e.g., 44.4% on Humanity's Last Exam, 87.5% on GPQA Science, 95% on AIME 2025 math).
- Available to SuperGrok and Premium+ subscribers, with a SuperGrok Heavy tier offering the most powerful Grok 4 variant.
- Pricing: approximately £22/month for SuperGrok and £222/month for SuperGrok Heavy.
- Grok 4 excels in complex reasoning and coding but is slower than some competitors like ChatGPT 4.
SuperGrok Heavy (Grok 4 Heavy)
- The most powerful version of Grok 4, delivering about 25% higher scores on complex reasoning tests compared to the base Grok 4 model.
- Designed for users needing top-tier performance in demanding reasoning, coding, and scientific tasks.
- Access is through the SuperGrok Heavy subscription tier.
Summary Table of Key Differences
| Feature/Version | Grok 3 | Grok 4 | SuperGrok Heavy (Grok 4 Heavy) |
|---|---|---|---|
| Release Date | February 2025 | July 2025 | July 2025 |
| Core Capabilities | Web browsing, image/file analysis, preloaded task modes, witty tone | Native tool use, real-time search, multimodal input (text, image, speech), multi-agent problem solving | Enhanced Grok 4 with 25% better complex reasoning scores |
| Architecture | Next-token prediction with reinforcement learning for reasoning | Reinforcement learning at pretraining scale on 200,000 GPU cluster (Colossus) | Same as Grok 4 but scaled up for performance |
| Context Window | Moderate | Very large (up to 256K tokens) | Very large |
| Benchmark Performance | Good for everyday and professional tasks | Superior in academic, coding, and reasoning benchmarks | Top-tier performance in complex reasoning |
| Pricing | Free + $30/month for full access | £22/month (SuperGrok) | £222/month (Heavy) |
| Target Users | Professionals, power users, researchers | Researchers, advanced users, professionals | Experts needing highest AI reasoning power |
In essence, Grok 4 and its SuperGrok Heavy variant represent a leap forward from Grok 3, with enhanced reasoning, multimodal capabilities, and integration of native tools and real-time search, making them suitable for complex, high-level tasks beyond the scope of Grok 3.
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