Grok 4.5

SpaceXAI's first model since the IPO, the Cursor acquisition, and the July rebrand — and its first built with Cursor. Pitched by Musk as "an Opus-class model, but faster, more token-efficient and lower cost," aimed at coding and agentic knowledge work: it builds complex Excel models with live web research and produces diagrams and slide content, with finance and legal capabilities co-developed with Cursor. Reportedly the first model shipped on the ground-up "V9" foundation stack, with V9-based variants planned on a monthly cadence. 500K context; $2/$6 per million input/output tokens ($0.50 cache hits). Available in Grok Build, Cursor (all plans), and the SpaceXAI console; not yet available in the EU. Proprietary. AA Intelligence Index 54 (v4.1, "high" reasoning) — #4 overall at release, up from Grok 4.3's 38.