It’s now the default mannequin for AI coding agent Grok Construct.
SpaceXAI has launched the primary Grok mannequin after its rebranding from xAI and the primary one it skilled with AI company Cursor. The corporate says Grok 4.5 is its smartest mannequin but, constructed particularly “to excel at coding, agentic duties and information work.” It was skilled throughout tens of 1000’s of NVIDIA GB300 GPUs on datasets stuffed with coding, science, engineering and math data.
The mannequin, SpaceX claims, outdoes different main fashions at actual engineering duties and is extremely proficient at creating useful apps with minimal directions. Within the instance above, Grok 4.5 was capable of generate an interactive simulation of the photo voltaic system with a single immediate. SpaceXAI additionally says that it was designed to reply quicker than “flash” fashions and to ship outcomes “at far decrease prices.” It is priced at $2 per million enter tokens and $6 per million output tokens. For comparability, OpenAI GPT-5.6’s strongest variant, Sol, prices $5 per million enter tokens and $30 per million output. Nevertheless, its most inexpensive variant, Luna, solely prices $1 per million enter tokens and $6 per million output.
Grok 4.5 is now the default mannequin powering the corporate’s terminal-based AI coding agent Grok Construct, which you need to use not only for coding, but in addition for Excel, PowerPoint and Phrase duties. It is also obtainable from the SpaceXAI console and in all of Cursor’s plans. “We have partnered with SpaceXAI to coach Grok 4.5,” Cursor announced on X. “It is our strongest mannequin but and the primary we have constructed for greater than software program engineering.”
In April, SpaceXAI and Cursor struck a partnership to develop AI collectively. The deal may see SpaceXAI both investing $10 billion into Cursor, or buying it altogether “later this yr” for $60 billion. They’ve but to disclose their determination. For now, you possibly can decide whether or not they work properly with one another via Grok 4.5. Take notice you could’t entry the mannequin but should you’re within the European Union, the place it is anticipated to turn out to be obtainable in mid-July.
We have partnered with SpaceXAI to coach Grok 4.5.
It is our strongest mannequin but and the primary we have constructed for greater than software program engineering. pic.twitter.com/U4B8Tedl34
— Cursor (@cursor_ai) July 8, 2026
