Grok 4.5

Grok 4.5 is a large language model developed by xAI (the AI company behind the Grok product line), co-trained with Cursor as a mixture-of-experts model designed to excel at coding, agentic tasks, and knowledge work. ## What Grok 4.5 Is Good For Grok 4.5 is purpose-built for demanding engineering and technical work. Its core strengths include: - **Complex coding tasks**: The model handles difficult, multi-step software engineering challenges in languages like Rust, C/C++, and end-to-end app development from prompt to production. It is the default model in the Grok Build coding agent. - **Agentic workflows**: Trained with reinforcement learning on multi-step tasks in realistic environments, it can investigate problems, use tools, recover from mistakes, and verify results across long-running sessions. - **Knowledge work beyond coding**: It has been designed for use in data science, finance, legal work, and other domains that require reasoning over documents and complex tool use. - **Real-time search integration**: By enabling server-side Web Search or X Search tools, developers can augment the model with live data, since the base model's knowledge has a training cutoff. - **Office productivity**: Grok 4.5 powers Word, PowerPoint, and Excel add-ins, capable of building complex diagrams, designing slide content, and creating multi-sheet Excel models with web research. Developers can access it via the [xAI API](https://x.ai/api), through the [Cursor](/tools/cursor) IDE on all subscription plans, or via third-party model gateways such as OpenRouter, Vercel, Cloudflare, and Snowflake. ## Who It's a Good Fit For Grok 4.5 is particularly well-suited for: - **Software engineers and agentic developers** who need a model that can autonomously navigate long coding sessions, debug Rust and systems-level code, and build full-stack apps from natural language prompts. - **Researchers and knowledge workers** in STEM fields who benefit from broad training across science, engineering, and math. - **Teams building AI-powered products** who want API access with configurable reasoning effort (low, medium, or high), prompt caching, and OpenAI-compatible endpoints. - **Cursor users** — since Grok 4.5 is bundled into individual and team Cursor plans as part of the first-party model pool. For users already familiar with frontier models like [Claude 3 Opus](/tools/claude-3-opus) or [ChatGPT-4](/tools/chatgpt-4), Grok 4.5 positions itself as a strong alternative specifically optimized for agentic and coding workloads, with a focus on token efficiency. ## Limitations and Where It Falls Short - **EU unavailability**: Grok 4.5 is currently not available in the EU through any xAI products or the API console, which is a significant restriction for European users and organizations. - **No built-in real-time knowledge**: The model does not have live knowledge out of the box — real-time data requires enabling optional server-side search tools explicitly. - **Separate image/audio/video models**: xAI uses dedicated models for audio, image, and video tasks; Grok 4.5 itself is a text and multimodal input model, not a generative media model. - **API-first access**: While a free tier exists via grok.com, the most powerful and flexible access to Grok 4.5 requires an API key and usage-based billing, which may not suit casual users.