Grok 4.20 Beta 0309 (reasoning)

Grok 4.1 Fast Reasoning is a high-speed variant optimized for faster reasoning while maintaining strong reasoning capabilities through "thinking tokens". It is designed for tool-calling tasks and agentic workflows. A standout feature is its massive 2 million token context window, allowing the analysis of large volumes of information in a single pass.

Grok 4.3 is a proprietary model from xAI, supporting text and image input while generating text output. This model is highly rated for its intelligence and is competitively priced compared to similar models. Grok 4.3 is also faster than average, though it tends to be quite verbose. It ranks highly among reasoning models and supports complex tasks.

Grok 4.5 (high) is a proprietary large language model developed by xAI, engineered to handle coding, agentic, and knowledge-based workflows. The model stands out for its deep reasoning capabilities and an expansive context window, delivering high performance alongside cost-efficient operations. It represents a powerful choice for enterprise applications, offered at an affordable price of $2.00 per million input tokens ($0.50 per million cached tokens) and $6.00 per million output tokens.