Grok Code Fast 1 is versatile across the full stack and is particularly strong at TypeScript, Python, Java, Rust, C++, and Go. Using Grok Code Fast 1, Danny Limanseta built the following game in a day.

The model is generally available via the xAI API, priced at $0.20 / 1M input tokens, $1.50 / 1M output tokens, and $0.02 / 1M cached tokens.

We built Grok Code Fast 1 from scratch, starting with a brand-new lightweight model architecture. Combined with novel improvements to accelerate serving efficiency, Grok Code Fast 1 sets a new standard for both speed and affordability.

Introducing Grok Code Fast 1, a speedy and economical reasoning model that excels at agentic coding. Now available for free on GitHub Copilot, Cursor, Cline, Kilo Code, Roo Code, opencode, and Windsurf.

While training Grok Code Fast 1, we prioritized end-user satisfaction as measured by real-world human evaluations. The result is a model rated by the developer community as fast, reliable, and economical for everyday coding tasks.

For the next 7 days, Grok Code Fast 1 is available for free on popular agentic coding platforms including Cursor, GitHub Copilot, Cline, opencode, Windsurf, Roo Code, and Kilo Code.

We’ve also put together a guide with tips on how to get the best results from Grok Code Fast 1.

We’d love to hear your feedback. The team is focused on delivering consistent updates to Grok’s coding abilities to improve user happiness and productivity. This is just the start, and if you’re excited about our team’s mission to build the world’s best coding models, we’d love to chat!

@DannyLimanseta Java developers everywhere

@DannyLimanseta This reminded me of a game I made back in college lol

@DannyLimanseta What about C#?

@DannyLimanseta How do we make it better at PHP? Would love to help.

@DannyLimanseta Is there a PDF on how to get started with this? When I used to do game development, it was with the Visual Studio IDE, C#, and I’m used to either older interpreted languages or OOP languages that are compiled.

@DannyLimanseta what about the assets/art?

@DannyLimanseta I still like Galaga fighting Aliens; the Best part is when you get that chance to hit that Alien ship; it becomes part of your ship. The BEST!!!!

@elonmusk @DannyLimanseta Way cool!

@elonmusk @DannyLimanseta Mind blowing how good Grok is getting

@DannyLimanseta No it's not strong in - rust, c++ - at all

That’s seriously impressive! @DannyLimanseta building a game in just one day with Grok Code Fast 1 showcases the incredible power and versatility of this tool. Its strength across languages like TypeScript, Python, and Rust clearly makes it a game-changer for developers. Kudos to the xAI team for creating such a robust model and to Danny for putting it to such awesome use!

@DannyLimanseta What a cool idea for middle school / high school teachers looking for computer science class project ideas to use in their curriculum. @xai Grok Code Fast 1 is a great teacher resource! @DannyLimanseta

@DannyLimanseta You should offer more combo packages. Grok + xAI tokens etc.

@elonmusk @DannyLimanseta William Blake Jacob's Ladder c.1805

@DannyLimanseta Speed is nice how does it handle large-scale refactors, CI integration, and test generation?

Grok Code Fast 1 is a recently released AI coding model developed by xAI. It is designed as a speedy and economical "agentic" model, meaning it excels at coding workflows that involve iterative reasoning and tool usage. The model was built from scratch and released on August 28, 2025.  As you noted, it is particularly strong in several programming languages and is noted for its full-stack capabilities.  Key features and capabilities •Versatile and full-stack: Grok Code Fast 1 is effective across the entire software development stack and is particularly proficient in TypeScript, Python, Java, Rust, C++, and Go. •Agentic coding: It is optimized for agentic coding workflows, where it can complete complex tasks with minimal oversight. It can build projects, answer questions about a codebase, and perform surgical bug fixes. •Blazing fast speed: The model features high-speed inference, which allows for a uniquely responsive experience. It was built with a brand-new, lightweight architecture and is optimized for speed and affordability. •Economical pricing: Grok Code Fast 1 is designed to be widely accessible, with competitive pricing based on token usage. This makes it an economical choice for tackling daily coding tasks. •Built-in tool use: The model has mastered the use of common tools like grep, terminal commands, and file editing, making it "at home" in your IDE. •Real-time evaluation: It was evaluated using a combination of public benchmarks like SWE-Bench and real-world human assessments by experienced developers to ensure practical performance.  Availability and use •Launch partners: The model is available for a free, limited-time trial through several launch partners, including GitHub Copilot, Cursor, and Cline. •xAI API: Developers can also access the model directly through the xAI API. •Designed for iterative tasks:According to xAI documentation, the model is best used for agentic-style tasks rather than one-shot queries. Developers are encouraged to provide context and refine their prompts iteratively to achieve the best results.

@DannyLimanseta Wow! People already building games on Grok :-) So cool!

@DannyLimanseta Impressive! 🎉 It's amazing what can be achieved in just a day with Grok Code Fast 1. Excited to see more innovative projects coming out of this tool! #TechInnovation

@elonmusk @DannyLimanseta Super cool result! Amazing coding model 🔥

@elonmusk @DannyLimanseta Can you print some money and cashapp it to me

@elonmusk @DannyLimanseta Holy fuck. I saw this coming too. I just didn't have the words.. Or how to describe it?.. And the whole multimodal thing... Wowsa! Glad I didn't have to learn all that 🤣🤣🤣🤣🤣

@elonmusk @DannyLimanseta Holy shit the graphics are near photo realistic quality! AI has come so far!

@elonmusk @DannyLimanseta Ai will make millionaires in future for sure.

@DannyLimanseta

@DannyLimanseta You had me at Rust.

@elonmusk @DannyLimanseta At first glance I thought this was Tecmo Bowl

@DannyLimanseta This is great for software development.

@elonmusk @DannyLimanseta No Swift ? 😔

@elonmusk @DannyLimanseta 👏👏👏

@DannyLimanseta @elonmusk I see a troll face in there somewhere.

@elonmusk @DannyLimanseta Amazing

@DannyLimanseta @grok, can it also code my breakup into a startup pitch ?

@DannyLimanseta nice work!! I look forward to coming up with something soon.

@DannyLimanseta @xai I built a school using @Grok The state of California is currently reviewing it for certification!