xAI dropped Grok 4.5 on July 8, 2026, calling it their strongest model to date. Built on a new foundation and trained on tens of thousands of NVIDIA GB300 GPUs, it's available right now across multiple platforms — including a live demo in Warp. Here's everything that matters.
1. It's Built on a Completely New Foundation
Grok 4.5 runs on xAI's 1.5T V9 foundation model — a significant architectural step up from previous versions. Training took place in xAI's Memphis data centers using tens of thousands of NVIDIA GB300 GPUs, with datasets spanning coding, science, engineering, and mathematics. Cursor training data was also incorporated during supplemental training, which partly explains the model's strong performance on developer-focused tasks.
2. Elon Musk Calls It an 'Opus-Class' Model
According to xAI, Grok 4.5 is designed to compete directly at the top tier of AI models. Elon Musk described it as an "Opus-class model" — positioning it against the most capable frontier models available — while emphasizing that it delivers competitive performance at better speed, token efficiency, and lower cost. That combination matters for developers and enterprises deciding where to route their workloads.
3. It's Available on More Platforms Than You'd Expect
Grok 4.5 isn't locked to a single entry point. According to xAI, it's accessible via the xAI API, is the default model in Grok Build, and is available through Cursor. It also ships as a plugin for Microsoft Word, PowerPoint, and Excel. For developers, model gateways including OpenRouter, Vercel, Cloudflare, Snowflake, and Databricks Mosaic all support it. X Premium and SuperGrok subscribers can access it directly through the Grok interface.
4. It's Genuinely Strong at Coding and Agentic Work
Grok 4.5 is specifically tuned for coding tasks — including Rust and C/C++ — and for agentic workflows where the model completes multi-step tasks autonomously. Beyond code, it handles finance and legal work, can build complex multi-sheet Excel models with live web research, design diagrams in PowerPoint, and write structured prose in Word. The Microsoft Office plugin integration makes this practically useful for a much wider audience than typical AI developer tools.
5. EU Users Will Have to Wait Until Mid-July
There's a notable geographic gap at launch. According to xAI, Grok 4.5 is not yet available in the EU — either through xAI products or the API console. Availability for EU users is expected in mid-July 2026. If you're based in Europe, the model is on its way but isn't accessible yet. Everyone else can try it today via Warp or through any of the supported platforms listed above.
6. You Can Try It Right Now in Warp
The fastest way to get hands-on with Grok 4.5 is through Warp, which xAI highlighted in their launch post. If you already have an X Premium or SuperGrok subscription, you can access it directly in the Grok interface as well. For developers, the xAI API is live and Grok 4.5 is set as the default in Grok Build — so if you've been building on earlier versions, the upgrade is already in place.
Grok 4.5 represents xAI's most serious push yet into the enterprise and developer market. The Microsoft Office integration in particular is an interesting move — it puts Grok directly into the workflows of millions of knowledge workers who may never open a dedicated AI interface. Whether the "strongest model ever" claim holds up under real-world use will become clearer quickly, but the breadth of access points at launch is genuinely notable.
Sarah focuses on Tesla Energy, SpaceX missions, and the broader Musk AI portfolio. Former data analyst in clean energy. Based in San Francisco.
Sources verified at publish time. Spotted an inaccuracy? Email editorial@basenor.com.
