Anthropic has announced the acquisition of Bun, the high-performance JavaScript runtime, in a move that underscores its ambition to accelerate the capabilities of its developer-focused product, Claude Code. Bun, known for its speed and efficiency in handling modern JavaScript workloads, will now become a core part of Anthropic’s infrastructure, boosting performance and scalability for developers who rely on Claude Code to build and run applications.
The acquisition comes at a pivotal moment. Claude Code has already surpassed $1 billion in run-rate revenue, a milestone that reflects both the rapid adoption of AI-assisted coding tools and the growing demand for reliable developer platforms. By integrating Bun, Anthropic is not only enhancing execution speed but also signaling its commitment to building a robust ecosystem where AI and runtime performance converge.
Bun’s reputation as a lightweight, fast alternative to Node.js and other runtimes makes it a natural fit for Anthropic’s vision. Its integration promises lower latency, improved resource efficiency, and smoother developer experiences, all of which are critical as AI-driven coding assistants scale to handle increasingly complex tasks. For Anthropic, the acquisition is more than a technical upgrade—it is a strategic investment in ensuring Claude Code remains competitive in a crowded market where speed and reliability are decisive factors.
The move also highlights the broader trend of AI companies acquiring or developing foundational technologies to secure their edge. As demand for AI coding tools grows, performance bottlenecks become more visible, and solutions like Bun offer a way to eliminate friction. Anthropic’s decision to bring Bun in-house reflects a recognition that owning the runtime layer provides both control and differentiation, allowing it to optimize Claude Code in ways competitors may struggle to match.
With Claude Code already generating significant revenue and Bun now part of its arsenal, Anthropic is positioning itself at the intersection of AI innovation and developer infrastructure. The acquisition signals a future where coding assistants are not only intelligent but also lightning-fast, reshaping how developers build, test, and deploy software in an era defined by AI-driven productivity.