Grok 4 Fast vs Grok 3 Fast

For developers looking for a cost-effective AI model with a large context window, Grok 4 Fast by xAI is the clear choice. With a massive 2,000,000 token context and the ability to handle text input, vision, and function calling, it's perfect for advanced reasoning tasks. On the other hand, Grok 3 Fast, with a smaller 131,072 token context and limited capabilities, is better suited for simpler AI tasks that don't require as much depth. Choose Grok 4 Fast for cutting-edge AI development and Grok 3 Fast for more straightforward projects.