SpaceXAI releases Grok 4.5 model

SpaceXAI on July 8 released Grok 4.5, a new flagship model the company is pitching for coding, agentic tasks and broader knowledge work. The company made the model available in Grok Build, through its API for developers, and inside Cursor across all subscription plans, according to SpaceXAI and Cursor. (x.ai) The launch is the company’s first major model release since going public, Axios and TechCrunch reported. (cursor.com) SpaceXAI described Grok 4.5 on its API page as its “newest flagship model” and said it leads the industry in coding, non-hallucination rate and agentic tool-calling capabilities. (x.ai) ### Where is Grok 4.5 actually available right now? SpaceXAI said Grok 4.5 is live in its API, with sample code published for Python, JavaScript and curl using the model name “grok-4.5.” The same API page says the service is compatible with OpenAI and Anthropic SDKs, with users migrating by changing an API key and base URL. (x.ai) Cursor said on July 8 that Grok 4.5 is also available across its desktop, web, iOS, CLI and SDK products. Cursor said individual and team subscriptions include usage from its first-party model pool, with doubled usage in the first week after launch. (axios.com) ### What is SpaceXAI saying the model is for? SpaceXAI said the model is built for “intelligent coding models for software engineering, building apps, and orchestrating agents,” alongside text generation and search-linked workflows. (x.ai) Reuters reported the company called Grok 4.5 its most intelligent model to date and said it was designed for coding and agentic tasks. Cursor said the model can handle “difficult, long-running tasks” that require tool use across software engineering, data science, finance, legal work and other computer-based tasks. (cursor.com) Cursor also said the training mix was kept broader than pure software engineering, drawing on STEM tasks, research papers and other knowledge-work material. ### How was Grok 4.5 trained? Cursor said Grok 4.5 is a mixture-of-experts model trained jointly with SpaceXAI. (x.ai) The company said training included trillions of tokens of Cursor data capturing user interactions with codebases and software tools. Reuters reported SpaceXAI said the model was trained across tens of thousands of Nvidia GB300 graphics processing units, with an emphasis on data filtering, deduplication and quality scoring. Cursor said reinforcement learning was applied on difficult tasks in realistic environments so the model learned to investigate problems, use tools, recover from mistakes and verify results. (cursor.com) ### What does the pricing and model footprint look like? SpaceXAI listed Grok 4.5 at $2 per million input tokens and $6 per million output tokens, with a 500,000-token context window. The company said the model supports both reasoning and non-reasoning modes. Cursor listed the same base pricing and said a faster variant costs $4 per million input tokens and $18 per million output tokens. TechCrunch reported Elon Musk described the model on X as “Opus-class,” comparing it with Anthropic’s high-end Opus line while arguing Grok 4.5 is faster and lower cost. (money.usnews.com) ### Why does Cursor matter in this rollout? Axios reported Grok 4.5 is SpaceXAI’s first release since the company went public and acquired the AI coding startup Cursor. (x.ai) Cursor said the model is the first it built for more than software engineering, while still centering long-running tool use and developer workflows. SpaceXAI’s own API materials frame the model as part of a broader developer platform that includes search, file handling and multimodal tools. (cursor.com) That combination puts Grok 4.5 into both an IDE-style environment and a direct API channel on the day of release. July 8 is the key launch date in the company’s rollout, and access points are already live through SpaceXAI’s API and Cursor’s apps and SDKs. Cursor said Grok 4.5 usage is doubled for the first week on individual and team plans, while SpaceXAI’s API documentation now lists the model in production pricing tables. (axios.com) (cursor.com) (x.ai)