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Anthropic, the developer of the advanced AI model Claude, has announced its acquisition of Bun, a high-performance JavaScript runtime, to improve its Claude Code platform. The move comes shortly after Claude Code hit a major financial benchmark, reaching $1 billion in annualized revenue just six months following its public launch in May 2025.
Claude stands out as a leading AI system tailored for developers, startups and large businesses, with Claude Code marking a shift toward more autonomous programming methods that streamline software creation for teams. The acquisition of Bun aims to boost the speed and efficiency of this technology, integrating Bun’s capabilities directly into Anthropic’s offerings.
Established in 2021 by Jarred Sumner, Bun has gained recognition for outperforming other JavaScript tools in terms of velocity. It serves as a comprehensive package that includes a runtime environment, package management, bundling and testing features, making it a vital asset in AI-driven development where quick iteration especially important.
For users of Claude Code, the deal promises quicker operations, greater reliability and additional features. Anthropic plans to maintain Bun as the top choice for JavaScript runtime while deepening its ties to Claude Code’s development processes. Since its debut, Claude Code has evolved from an experimental project within Anthropic to an indispensable resource for major corporations such as Netflix, Spotify, KPMG, L’Oreal and Salesforce, with Bun playing a pivotal role in expanding its backend systems.
The two companies have collaborated closely over recent months, a partnership that contributed to the rollout of Claude Code’s dedicated installation tool, as shared in an online update. This alignment stems from a shared commitment to innovating developer tools based on practical needs.
Mike Krieger, Anthropic’s chief product officer, highlighted the strategic fit, stating that Bun embodies the level of innovation the company seeks to incorporate. He noted that the team behind Bun redesigned the JavaScript ecosystem from the ground up with user demands in mind. With Claude Code achieving its revenue milestone in record time, integrating Bun will help sustain this progress amid surging demand for AI technologies.
Bun has seen widespread adoption, boasting over 7 million downloads each month, more than 82,000 stars on GitHub and use by firms like Midjourney and Lovable to enhance their workflows. As AI increasingly powers software development, robust supporting tools like Bun become essential.
Anthropic described the purchase as part of its careful expansion strategy, focusing on deals that advance technical prowess, solidify its position in business-oriented AI and stay true to core values. Looking ahead, Bun will support the creation of future software foundations, positioning Claude as the preferred AI hub for programmers and professionals dependent on intelligent systems.
Bun will continue operating under its open-source MIT license, with Anthropic committing ongoing resources to keep it as the go-to solution for JavaScript and TypeScript work. Those interested in engineering roles at Anthropic can explore opportunities on the company’s careers page.
