Grok 4.5: xAI’s Fast, Low-Cost AI Model — What It Is and How to Chat With It Free
Grok 4.5 is the latest large language model from Elon Musk’s xAI, released on July 8, 2026. It is xAI’s smartest model to date, tuned for coding, agentic tasks, and everyday knowledge work — pitched not as the single most powerful model, but as the fastest and cheapest of the frontier tier.
Below you’ll find what Grok 4.5 actually is, its headline features and benchmarks, how it stacks up against Claude Opus and GPT-5, and how to start chatting with it free online in seconds.
What Is Grok 4.5?
Grok 4.5 is a large language model developed by xAI, publicly released July 8, 2026 after a late-June private beta at SpaceX and Tesla. It’s the latest step in the Grok line, which started with Grok 4 in mid-2025 and moved through Grok 4.3 and Grok Build 0.1 before this release. For background on the full model lineage, see the Grok chatbot entry on Wikipedia; the launch itself is documented in xAI’s official announcement.
The model and who built it
xAI, the company Musk founded to build Grok, positions 4.5 as its strongest model to date rather than a marginal update. The release sequence leading up to it:
- Grok 4.5 model overview — capabilities, benchmarks and what’s new
- Grok 4.5 features — real-time search, coding, vision and more
- Grok 4.5 API guide — access, pricing and a quick start
- Grok 4.5 pricing — free tiers, SuperGrok and API costs
- How to use Grok 4.5 — a complete guide across app, web and API
- Grok 4.5 use cases — real examples of what Grok can do
- Grok 4.5 vs GPT-5 — pricing, benchmarks and which to pick
- Grok 4.5 vs Claude — an Opus-class model at a lower price
Frequently Asked Questions
- What is Grok 4.5?
Grok 4.5 is a large language model from xAI, the latest in the Grok family of conversational AI. It can answer questions, help with coding, reason through problems, understand images and pull in real-time information. On this site you can chat with a Grok-style assistant for free.
- Is this the official Grok from xAI?
No. grok-ai.pro is an independent, unofficial site that lets you chat with a Grok-style AI assistant for free and provides reference guides about the Grok 4.5 model. It is not affiliated with, endorsed by, or operated by xAI. For the official product, visit x.ai or grok.com.
- Is the Grok 4.5 chat free?
Yes — you can start chatting instantly, with no login and no download. Basic messages are free and available 24/7. Extended usage is available via an optional subscription shown in the chat interface.
- Do I need an account to use it?
No account or sign-up is required to start. Just open the chat on the homepage and type your question.
- What can I ask Grok 4.5?
Almost anything: general questions, coding and debugging help, writing and brainstorming, explanations, data analysis, image understanding and real-time information. See the use-cases page for concrete examples.
- How is Grok 4.5 different from earlier versions?
Each Grok release improves reasoning, coding ability, context length and real-time capabilities over the last. See the model page for a detailed, fact-checked comparison of Grok 4.5 versus earlier versions.