Introducing Grok 4.5

Grok 4.5, released in collaboration with SpaceXAI, is an advanced mixture-of-experts model designed to handle complex, long-running tasks across various domains such as software engineering, data science, and legal work. Unlike its predecessor, Composer 2.5, which focused on coding, Grok 4.5 was trained on a diverse dataset that includes trillions of tokens from user interactions and high-quality STEM tasks, making it proficient in multiple fields. The model leverages reinforcement learning in challenging environments to develop problem-solving skills, tool usage, and result verification, with environments constructed by a distributed agent system for scalability. Available on multiple platforms, Grok 4.5 is part of the Cursor subscription plans and offers significant usage benefits, with pricing structured per million input and output tokens. The model's performance on benchmarks like CursorBench is noteworthy, though an earlier inclusion of Cursor codebase data might have influenced results, which has since been rectified for future models.

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