xAI has released Grok 4.5, a 1.5-trillion-parameter Mixture-of-Experts model trained on real developer interaction data from the Cursor IDE. This unique training approach, which includes multi-file diffs and debugger sessions, aims to improve the model's ability to assist developers in agentic workflows. While Grok 4.5 offers fast serving speeds and a broad training mix beyond just coding, it has a reduced context window compared to its predecessor and faced benchmark contamination issues due to an accidental inclusion of Cursor's codebase. AI
IMPACT Sets new SOTA on developer workflow tasks; may accelerate agentic AI adoption.
RANK_REASON Frontier-lab model release with system card. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
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