SpaceXAI launches Grok 4.5, its smartest model yet, available in Grok Build, Cursor and console

SpaceXAI launched Grok 4.5, its smartest model yet and its first release since going public and acquiring the AI coding startup Cursor, Axios reported. The company is pitching the model as a coding and agentic-work tool. SpaceXAI said Grok 4.5, trained alongside Cursor, outperforms comparable models on engineering and knowledge work. Elon Musk wrote on X that "It is an Opus-class model, but faster, more token-efficient and lower cost," referencing what was until recently Anthropic's top model family. A chart accompanying the announcement says the model outperforms Opus 4.8 on several key benchmarks, Axios said. Grok 4.5 is available in Grok Build, in Cursor on all plans, and from the SpaceXAI console. It is not yet available in the EU. SpaceXAI priced the model at $2 per million input tokens and $6 per million output tokens. The company claims the new Grok outperforms some OpenAI and Anthropic models on speed, price and performance, but not the largest, latest models from those competitors, according to Axios.