SpaceXAI has announced Grok 4.5, its latest artificial intelligence model designed for coding, agentic tasks, and knowledge work. The company describes it as its most advanced model to date and said it was developed alongside Cursor.
Grok 4.5
According to SpaceXAI, Grok 4.5 was trained on datasets covering coding, science, engineering, and mathematics using tens of thousands of NVIDIA GB300 GPUs. The training process included data filtering, deduplication, quality scoring, domain-specific data selection, and stability techniques designed for large-scale runs.
The company also expanded reinforcement learning with hundreds of thousands of multi-step software engineering and technical tasks using automated and model-based grading. SpaceXAI said its asynchronous training infrastructure enables long-running agentic rollouts while training continues across tens of thousands of GPUs, improving reasoning on engineering and agentic tasks.
The company also claims Grok 4.5 outperforms comparable leading models on real-world engineering tasks.
Coding and productivity capabilities
Grok 4.5 supports software development across languages including Rust and C/C++, and can generate complete applications from a single prompt.
SpaceXAI said the model delivers inference speeds of up to 80 tokens per second (TPS) and achieves roughly 2x better token efficiency than comparable leading models, allowing it to complete tasks using fewer generated tokens. The company added that this enables Grok 4.5 to deliver higher intelligence per unit of time and cost.
Grok 4.5 is also the default model in Grok Build, where it can:
- Build complex Excel workbooks involving web research and multi-sheet formulas
- Leave reference notes within Excel files
- Generate Microsoft Word documents
- Create PowerPoint presentations and diagrams using native PowerPoint shapes
Pricing and availability
Grok 4.5 is priced at:
- $2 per million input tokens
- $6 per million output tokens
The model is available through Grok Build, Cursor on all plans, and the SpaceXAI console. SpaceXAI is also offering free Grok 4.5 usage for a limited time in Grok Build and Cursor.
The company noted that Grok 4.5 is not yet available in the European Union across its products or API console, with availability expected in mid-July.