Grok 4.5 Ships as SpaceXAI + Cursor's First Joint Frontier Model — Uses 4.2x Fewer Output Tokens Than Opus 4.8 on SWE-Bench Pro

The Next Web (corroborated by Gizmodo, Yahoo Finance / The Information, CryptoBriefing)·high signal

SpaceXAI launched Grok 4.5 on July 8 — a ~1.5T-param MoE trained jointly on Cursor's data, priced at $2/$6 per million tokens and available in Cursor and the xAI API. The builder-relevant number: it resolves SWE-Bench Pro tasks with an average of 15,954 output tokens vs 67,020 for Opus 4.8, a 4.2x efficiency gap that translates directly into lower agentic-pipeline cost; Artificial Analysis ranks it #4 overall (behind Fable 5, GPT-5.6 Sol, Opus 4.8). It lands alongside SpaceX's confirmed $60B all-stock (~15x revenue) acquisition of Cursor, closing Q3 2026.