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SpaceXAI has announced Grok 4.5, its latest large language model designed for software development, agentic workflows, and professional knowledge work. Developed in collaboration with Cursor, the company describes Grok 4.5 as its most advanced AI model so far, featuring improvements in coding, reasoning, and productivity while delivering faster inference and improved token efficiency.
Built For Coding & Engineering Workloads
According to SpaceXAI, Grok 4.5 was trained using datasets spanning software development, science, engineering, and mathematics on tens of thousands of NVIDIA GB300 GPUs.
The training pipeline included:
- Data filtering and deduplication
- Quality scoring
- Domain-specific dataset selection
- Large-scale training stability optimizations
The company also expanded reinforcement learning using hundreds of thousands of multi-step software engineering and technical tasks, evaluated through automated and model-based grading systems.
SpaceXAI said its asynchronous training infrastructure enables long-running agentic rollouts while training continues across thousands of GPUs, improving reasoning and performance on complex engineering tasks.
According to the company, Grok 4.5 outperforms comparable leading AI models across several real-world software engineering benchmarks.
Faster Coding & Productivity Tools
Grok 4.5 supports software development across multiple programming languages, including Rust and C/C++, and can generate complete applications from a single prompt.
SpaceXAI claims the model delivers:
- Inference speeds of up to 80 tokens per second (TPS)
- Approximately 2x better token efficiency than comparable leading models
- Higher intelligence per unit of time and cost through reduced token generation
Integrated with Grok Build
Grok 4.5 also serves as the default model within Grok Build, where it supports a range of productivity workflows beyond software development.
The model can:
- Create complex Microsoft Excel workbooks with web research and multi-sheet formulas
- Add reference notes within Excel files
- Generate Microsoft Word documents
- Build Microsoft PowerPoint presentations
- Create diagrams using native PowerPoint shapes
Price & 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 across all subscription plans, and the SpaceXAI Console.
For a limited time, SpaceXAI is also offering free access to Grok 4.5 within Grok Build and Cursor.
The company added that Grok 4.5 is not yet available in the European Union across its products or API Console, with availability expected to begin in mid-July.
