Grok 4 vs. Grok 3: What’s New in xAI’s Latest Model

Following AI news lately? You’ve probably heard a lot about xAI’s new release, Grok 4. It came out in July 2025 and builds on Grok 3, which arrived earlier this year. Grok 4 makes big improvements in reasoning, handling different types of information, and everyday use. I’ve looked at the details and tests, so here’s a simple summary of how Grok 4 and Grok 3 compare. Whether you’re a developer, researcher, blogger, or just a big AI fan, these changes matter. Grok 4 is getting noticed for being the best AI so far.

xAI, started by Elon Musk, wants to make AI that can understand almost anything. Grok 3 was good at thinking things through and could handle text jobs well. Grok 4 goes way further. It uses more hardware, better training, and new options. It’s a big step in the push for smarter AI.

How Grok 4 Gets Smarter at Reasoning

The biggest change in Grok 4 is deep reasoning. Grok 3 used next-word prediction along with basic learning to solve problems. Grok 4 is all about serious reasoning. It doesn’t fall back on simple predictions. This helps Grok 4 answer tough questions and learn better, giving more accurate results.

Grok 4 was trained on a giant 200,000-GPU system called Colossus. This made it six times more efficient than past models. Grok 4 also learned from a much bigger set of data, not just math and code, but science, engineering, and other topics too. It performs better in tests and is even beating many graduate students in different fields. xAI thinks Grok 4 could even help lead to new discoveries.

There’s also Grok 4 Heavy, found in the new SuperGrok Heavy plan. It uses a team of AIs working together, which makes it faster and more accurate. Grok 3 didn’t have this teamwork, so it’s not as fast or sharp as Grok 4 Heavy.

Grok 4 can now solve new problems, use real-time info from Musk’s other companies like X, Tesla, and SpaceX, and understand internet jokes and memes better. Grok 3 was not as strong in these areas.

Grok 4 Handles Text and Images

For developers, the new xAI API can do more, but some older settings, like presencePenalty, may not work, so you may need to adjust older code.

Grok 3 focused almost only on words and did well at language tasks, but not with pictures or videos. Grok 4 can handle both text and visuals right away, and soon it will be able to create images too. It can look at pictures, notice patterns, and even use a live camera in voice calls to share what it sees.

xAI is working on video tools and plans to roll them out in October 2025. Grok 3 did not cover these, making Grok 4 the better choice for people who create content or need to work with images and video.

Grok 4 can also handle twice as much info at once: 256,000 tokens compared to Grok 3’s 131,072. This means it can keep up with longer texts or chats easily.

For coding, Grok 4 Code (coming August 2025) will let users write and edit code more easily than Grok 3.

Smarter, More Realistic Conversations

Grok 4 uses voices that sound more real, making phone and app chats feel more alive. Grok 3’s voice sounded flat and robotic. Grok 4 can also watch video in real time, which Grok 3 could not do.

Search features are better, too. Grok 4 lets you search by keywords or meaning, shows media, and brings in live news and web updates. It also now has built-in tools like code readers and web browsing, something Grok 3 only did in a limited way.

For developers, the new xAI API can do more, but some older settings, like presencePenalty, may not work, so you may need to adjust older code. Early problems, such as strange web searches for personal questions, are being fixed.

The Future: True General AI

Grok 3 made a splash by being smart and cheap, but Grok 4 learns quicker and keeps improving with user feedback. xAI will keep growing Grok 4’s training into new fields, not just vision and audio, but real-life problems too.

In short, Grok 4 is not just a small update. It’s a big change, mixing smart features and links to Musk’s other companies.

Why Grok 4 Matters

Grok 4 does better than Grok 3 in almost every way—problem solving, media, talking, and searching. Whether you want smarter science help or better chats, Grok 4 is a great pick. If you use SuperGrok or Premium+, you can try it today on grok.com, the X app, or with the API. For full details, go to xAI’s official channels.

What do you think? Share your thoughts about Grok 4 and how it might shape the future of AI.

I have an earlier post from a couple of months ago Grok 3 vs ChatGPT.

This Post was created using Grok 4