SpaceXAI, the company that recently shed its xAI name, rolled out Grok 4.5 on Thursday, marking a milestone as the first large‑language model it trained together with AI development platform Cursor. The announcement positions Grok 4.5 as the firm’s most powerful model to date, engineered specifically for software development, agentic workflows and broader knowledge‑work tasks.

According to SpaceXAI, the model was trained on a massive compute cluster comprising tens of thousands of NVIDIA GB300 graphics processing units. The training data set leaned heavily on code, scientific literature, engineering schematics and mathematical content, giving the model a deep well of technical expertise. In internal tests, Grok 4.5 outperformed competing models on real‑world engineering problems and was able to generate fully functional applications from very short prompts. One demonstration showed the model producing an interactive simulation of the solar system after a single sentence description.

Grok 4.5 now powers the company’s terminal‑based AI coding assistant, Grok Build. While the agent’s primary focus remains software development, the integration also extends to everyday productivity tools such as Excel, PowerPoint and Word, letting users tap the model for a range of office tasks. The model is also accessible through the SpaceXAI console and is included in every plan offered by Cursor.

Pricing and market positioning

SpaceXAI emphasizes speed and cost efficiency as core differentiators. The firm quotes a price of $2 per million input tokens and $6 per million output tokens for Grok 4.5. By comparison, OpenAI’s most powerful GPT‑5.6 variant, Sol, costs $5 per million input tokens and $30 per million output tokens, while OpenAI’s budget‑friendly Luna tier runs $1 per million input tokens and $6 per million output tokens. SpaceXAI claims the lower price point, combined with faster response times than what it calls “flash” models, makes Grok 4.5 an attractive option for enterprises seeking high‑performance AI without the premium price tag.

The partnership with Cursor, announced in April, could evolve into a deeper financial relationship. Sources indicate SpaceXAI is weighing a $10 billion equity investment in Cursor or a possible acquisition later this year for as much as $60 billion. Neither side has confirmed a final decision, leaving the industry to speculate on how the collaboration might reshape the AI tooling market.

Availability remains limited for users in the European Union, where regulatory hurdles have delayed rollout. SpaceXAI expects to open access to EU customers by mid‑July, pending compliance reviews.

Overall, Grok 4.5 represents SpaceXAI’s most ambitious push into the competitive generative‑AI space, blending cutting‑edge hardware, specialized training data and a strategic partnership that could broaden its reach beyond pure coding assistance.

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