SpaceXAI has launched Grok 4.5, its most capable model yet. It is the company’s first release since going public and buying the AI coding startup Cursor. This is the joint model the two firms had raced to ship. Elon Musk aimed it squarely at coding and agentic work, not casual chat.
“It is an Opus-class model, but faster, more token-efficient and lower cost,” Musk wrote on X. The line name-checks Anthropic’s top Opus family. A chart with the announcement claims Grok 4.5 beats Opus 4.8 on several benchmarks, Axios first reported.
Built for coders, and for Wall Street
Grok 4.5 was trained alongside Cursor, which SpaceX agreed to buy in a deal valuing the startup at $60bn. The model is built to “handle difficult, long-running tasks,” according to the company’s blog post, including software engineering. Unlike Cursor’s earlier models, it also targets legal and financial work, and adds cybersecurity features, Bloomberg reported.
The finance push is deliberate. Musk said this year that his AI unit, known as xAI before it merged with SpaceX, had fallen behind on coding. The company has since rebuilt the team and chased Wall Street clients for its Grok chatbot. Grok 4.5 is the clearest sign yet of that pivot towards paying business customers.
