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Anthropic Acquires Bun, Claude Code Reaches $1 Billion Run-Rate Revenue

Anthropic has acquired Bun, a JavaScript runtime, to accelerate Claude Code, which achieved $1 billion in run-rate revenue in November, six months after its public availability.

By Illumora Editorial

Source · Sep 10, 2026, 6:15 PM · On Illumora · Sep 10, 2026, 6:23 PM

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Read the source →Anthropic News (priority) — Anthropic acquires Bun as Claude Code reaches $1B milestone
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Anthropic, an AI safety and research company, announced its acquisition of Bun, a JavaScript runtime. This acquisition aims to further accelerate Claude Code, an AI model for developers, startups, and enterprises. Claude Code reached $1 billion in run-rate revenue in November, six months after becoming publicly available.

Bun, founded by Jarred Sumner in 2021, is described as an all-in-one toolkit combining a runtime, package manager, bundler, and test runner. It has optimized the JavaScript and TypeScript developer experience for reliability, speed, and delight. For users of Claude Code, this acquisition is expected to bring faster performance, improved stability, and new capabilities.

Key Points

  • Anthropic acquired Bun, a JavaScript runtime, to enhance Claude Code.
  • Claude Code achieved $1 billion in run-rate revenue in November.
  • This milestone was reached six months after Claude Code became publicly available.
  • Bun, founded in 2021 by Jarred Sumner, is an all-in-one JavaScript toolkit.
  • Bun will remain open source and MIT-licensed.
  • The acquisition is expected to provide faster performance, improved stability, and new capabilities for Claude Code users.
  • Bun records over 7 million monthly downloads and has over 82,000 GitHub stars.

Context

According to Anthropic, Claude Code has grown from an internal engineering experiment into a critical tool for enterprises such as Netflix, Spotify, KPMG, L’Oreal, and Salesforce since its general availability in May 2025. Bun has been instrumental in scaling Claude Code's infrastructure, and the collaboration directly contributed to the recent launch of Claude Code's native installer. Mike Krieger, Chief Product Officer of Anthropic, stated that Bun represents the technical excellence Anthropic seeks to integrate.

Why It Matters

The acquisition of Bun by Anthropic indicates a strategic move to bolster the infrastructure supporting AI-led software engineering. This development could impact developers and enterprises relying on Claude Code by enhancing its performance and capabilities, while also reinforcing Anthropic's position in enterprise AI.

What To Do

  • Note that Bun will remain open source and MIT-licensed, indicating continued accessibility for all developers.
  • Observe the performance and capability improvements in Claude Code following the integration of Bun.
  • For JavaScript and TypeScript developers, consider Bun as a runtime, bundler, package manager, and test runner.
  • Watch for further announcements regarding new workflows and features within Claude Code.