Anthropic Acquires Bun as Claude Code Reaches $1 Billion in Run-Rate Revenue in Just 6 Months

Anthropic makes first acquisition with purchase of Bun to accelerate Claude Code - SiliconANGLE

Anthropic makes first acquisition with purchase of Bun to accelerate Claude Code Artificial intelligence company Anthropic PBC today announced it had made its first acquisition in acquiring developer tools startup Bun for an undisclosed price. Founded in 2019, Bun offers an all-in-one JavaScript/TypeScript toolkit that aims to simplify and accelerate full-stack development. The company's offering is similar in purpose to Node.js but also includes tools developers usually pull in separately, including a package manager, a bundler, a test runner and script runner, all shipped as a single executable. Bun is built using the Zig programming language and leverages Apple's JavaScriptCore under the hood to yield much faster startup times and lower memory usage compared with runtimes based on the V8 engine, the engine used by Node.js and others. Bun is often significantly faster in key developer workflows, such as package installation, build/bundling, test execution and runtime, making it appealing to Anthropic. The tools provided by Bun are broadly compatible with existing Node.js code and support many Node core application programming interfaces, such as file system, path and networking, along with resolving modules that work in a way similar to Node's module resolution. Bun could be described as a super charged version of Node.js. For Anthropic, the acquisition will result in faster performance, improved stability and new capabilities for those using Claude Code, Anthropic's coding support model. Enhancing Claude Code is key to the acquisition, as Bun has been key in helping scale the infrastructure used by Claude Code throughout its evolution. "Bun represents exactly the kind of technical excellence we want to bring into Anthropic," said Mike Krieger, chief product officer of Anthropic, in an announcement post. "Claude Code reached $1 billion in run-rate revenue in only 6 months and bringing the Bun team into Anthropic means we can build the infrastructure to compound that momentum and keep pace with the exponential growth in AI adoption." While Bun may be Anthropic's first acquisition, it won't be its last, with Anthropic noting that the acquisition was in line with its "strategic, disciplined approach to acquisitions" and that the company "will continue to pursue opportunities that bolster our technical excellence, reinforce our strength as the leader in enterprise AI and most importantly, align with our principles and mission. Coming into the acquisition, Bun had raised a single seed round of $7 million in 2022 from investors including Kleiner Perkins Caufield & Byers and Johannes Schickling.

Why Anthropic Bought Bun, a High-Speed Runtime to Power Claude Tools and Dev Agents

What happens when a innovative AI research company acquires one of the fastest JavaScript runtimes on the market? The tech world is abuzz with the news that Anthropic has acquired Bun, a move that could reshape the landscape of AI-driven software development. Known for its blazing speed and lightweight design, Bun has already gained a reputation as a high-performance alternative to Node.js. Now, with Anthropic's expertise in artificial intelligence, this acquisition signals a bold step toward creating more scalable, efficient, and autonomous coding tools. But here's the twist: despite the acquisition, Anthropic has pledged to keep Bun open source, making sure developers worldwide can still access and innovate with this new technology. In the video Better Stack unpacks the strategic importance of Bun in Anthropic's ecosystem and what this acquisition means for the future of AI-powered coding. From enhancing tools like Claude Code to transforming workflows with the Claude Agent SDK, Anthropic is integrating Bun to supercharge its AI capabilities. But why is Bun so critical, and how does it fit into the broader vision of automated software development? As we delve deeper, you'll discover how Bun's unique attributes, its speed, scalability, and open source nature, position it as a cornerstone for the next generation of AI-driven tools. This isn't just a story about an acquisition; it's a glimpse into the future of how machines and humans will collaborate to build software. The decision to acquire Bun underscores its potential to transform AI coding tools. Bun's lightweight, high-speed runtime provides an ideal foundation for AI-driven environments, allowing faster and more efficient workflows. By incorporating Bun into its ecosystem, Anthropic seeks to achieve several key objectives: This acquisition positions Bun as a critical component in the future of AI-powered coding, aligning seamlessly with Anthropic's broader mission to advance AI-driven workflows and tools. Bun has gained recognition as a high-performance alternative to Node.js, offering faster runtimes and features tailored to modern development needs. Its compatibility with existing JavaScript frameworks and its ability to produce single-file executables make it particularly valuable for AI-driven applications. Bun's unique attributes include: Following the acquisition, Anthropic plans to invest heavily in Bun's development, making sure it meets the rigorous demands of AI coding tools while maintaining its reputation for speed and reliability. Unlock more potential in Anthropic by reading previous articles we have written. Bun's design philosophy aligns perfectly with the requirements of AI-driven coding environments. Its predictable performance and ability to scale make it an ideal choice for supporting AI agents in automating repetitive tasks and developing sophisticated software systems. By acquiring Bun, Anthropic secures a vital piece of infrastructure that will enable the creation of more advanced AI tools and systems. This move not only enhances Anthropic's capabilities but also ensures that Bun has the resources and stability needed for sustained growth and innovation. The acquisition reflects a shared vision between Bun's founder and Anthropic's leadership. Both parties recognize the fantastic potential of AI in software development and the critical role efficient tools play in realizing this potential. Together, they aim to push the boundaries of what AI agents can achieve, from streamlining routine coding tasks to allowing the development of complex, autonomous systems. This collaboration is expected to drive innovation and set new standards for AI-driven coding tools. Despite its proprietary offerings, such as Claude Code, Anthropic has reaffirmed its commitment to keeping Bun open source. This decision ensures that the global developer community can continue to contribute to and benefit from Bun's advancements. By maintaining transparency and accessibility, Anthropic fosters an environment of collaboration and innovation, further solidifying its position as a leader in the AI coding ecosystem. This open source approach not only benefits developers but also accelerates the evolution of AI-driven tools and technologies. As AI agents become increasingly capable of tackling complex coding challenges, the demand for fast, efficient, and scalable tools will continue to grow. Anthropic's acquisition of Bun positions the company at the forefront of this evolution. By combining Bun's high-performance runtime with Anthropic's expertise in AI, the company is poised to redefine software development in the era of automation. This acquisition secures Bun's future as a cornerstone of AI-driven coding infrastructure. With Anthropic's support, Bun is set to play a pivotal role in shaping the next generation of software development tools, driving innovation, efficiency, and collaboration across the industry. The integration of Bun into Anthropic's ecosystem marks a significant milestone in the journey toward more advanced and automated software development processes.

Anthropic acquires Bun as Claude Code hits $1B revenue milestone By Investing.com

Investing.com -- Anthropic has acquired Bun, a JavaScript runtime, following its AI coding assistant Claude Code reaching $1 billion in run-rate revenue just six months after public release. Bun, founded by Jarred Sumner in 2021, offers an all-in-one toolkit that combines runtime, package manager, bundler, and test runner capabilities. The JavaScript runtime has been downloaded over 7 million times and has garnered more than 82,000 stars on GitHub. The acquisition aims to enhance Claude Code's performance and capabilities. Claude Code has become a critical tool for enterprises including Netflix, Spotify, KPMG, L'Oreal, and Salesforce since its general availability in May 2025. "Bun represents exactly the kind of technical excellence we want to bring into Anthropic," said Mike Krieger, Chief Product Officer of Anthropic. "Jarred and his team rethought the entire JavaScript toolchain from first principles while remaining focused on real use cases." Anthropic confirmed that Bun will remain open source and MIT-licensed, with continued investment to make it the preferred runtime for JavaScript and TypeScript developers. The companies have been collaborating for months, with Bun playing a key role in scaling Claude Code's infrastructure and supporting the launch of its native installer. Anthropic described the acquisition as aligned with its "strategic, disciplined approach" that reinforces its position in enterprise AI while supporting its broader mission. This article was generated with the support of AI and reviewed by an editor. For more information see our T&C.

Anthropic acquires developer tool startup Bun to scale AI coding

Dec 2 (Reuters) - Artificial intelligence startup Anthropic said on Tuesday it has acquired Bun, which helps developers run and manage codes more effectively, as the Claude maker looks to boost the speed and stability of its coding agent. Bun is expected to help Anthropic scale its code-generation tool Claude Code, which reached an annualized revenue run rate of $1 billion since its launch earlier this year. Anthropic had already been using Bun for several months. Claude Code, generally available since May, has been adopted by large enterprises including Netflix, Spotify and Salesforce. "Bun will be instrumental in helping us build the infrastructure for the next generation of software," Anthropic said. Founded by Jarred Sumner in 2021, Bun serves as an all-in-one software toolkit, combining code runtime, package management, bundling and testing. The deal, financial terms of which were not known, marks a significant move by Anthropic into developer tooling and follows rapid expansions fueled by major backers. Last month, Microsoft and Nvidia announced plans to invest up to $15 billion in Anthropic, in the latest AI-driven tie-up that also includes a $30 billion commitment by the Claude maker to use Microsoft's cloud services. Founded in 2021 by former OpenAI staff, Anthropic was recently valued at $183 billion and has become a major rival to OpenAI, driven by the strong adoption of its services by enterprise customers. (Reporting by Harshita Mary Varghese in Bengaluru; Editing by Krishna Chandra Eluri)