SpaceX released Grok 4.5 on Wednesday, the first artificial intelligence model the company has trained specifically for coding and autonomous agents, and the first tangible product of its $60 billion acquisition of the AI coding startup Cursor, completed just weeks ago. The company said in a post on X that it "was trained with Cursor and offers frontier intelligence at leading speeds and cost efficiency." SpaceX is not claiming Grok 4.5 is the smartest model but is making an economic argument, stating the model uses half as many tokens per task as comparable models, delivers higher throughput, and costs less than half as much — priced at $2 per million input tokens and $6 per million output tokens. Elon Musk wrote on X that "Grok 4.5 is roughly comparable to Opus 4.7, but much faster." Independent evaluations from Artificial Analysis ranked the model fourth on its GDPval-AA v2 index with an Elo score of 1543, "behind only the latest Claude releases from Anthropic." Artificial Analysis measured Grok 4.5 at $0.49 per completed task, "nearly 90% cheaper than the models ahead of it on our leaderboard," placing it "clearly on the Pareto frontier for performance versus cost."