The model, trained with AI coding startup Cursor, is priced below Anthropic's comparable offering but trails some rivals on performance
Samuel Boivin/NurPhoto via Getty Images
SpaceXAI on Wednesday launched Grok 4.5, a new AI model built for coding and agentic tasks, priced at $2 per million input tokens and $6 per million output tokens. Access to the model is available across Grok Build, all Cursor plans, and the SpaceXAI developer console.
SpaceX CEO Elon Musk described the model in a post on X $TWTR as "an Opus-class model, but faster, more token-efficient and lower cost," referencing Anthropic's top model family. By comparison, Anthropic charges $5 per million input tokens and $25 per million output tokens for Claude Opus 4.8, according to Reuters, while OpenAI's GPT-5.6 Luna comes in at $1 per million input tokens and $6 per million output tokens.
SpaceXAI said the model runs at 80 tokens per second and delivers roughly twice the token efficiency of comparable leading models, meaning it completes tasks in fewer steps. The company said Grok 4.5 also supports finance and legal work, including building multi-sheet Excel models and creating PowerPoint presentations using native shapes. However, according to Axios, the model does not outperform the largest, most recent models from OpenAI and Anthropic.
Grok 4.5 was trained alongside Cursor, the AI coding startup SpaceX agreed to acquire in a $60 billion all-stock deal expected to close in the third quarter of 2026. Cursor said in a statement that it partnered with SpaceXAI on the model's training. Development involved a collaborative exchange of data and compute between the two firms, with training conducted across tens of thousands of Nvidia $NVDA GB300 GPUs.
European Union users will have to wait for access; SpaceXAI has indicated a mid-July target for that rollout.
The launch comes during a period of heightened regulatory attention on powerful AI models. Following a government push to limit the rollout of GPT-5.6, OpenAI said the model would be released widely on Thursday. The model also adds cybersecurity features; Cursor noted in its blog post that safeguards are in place to screen out malicious users without impeding legitimate vulnerability research.
SpaceXAI was formed earlier this year after SpaceX folded xAI, Elon Musk's AI startup, into its operations.
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