Latest Bun News & Updates

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Bun

JavaScript and TypeScript runtime and developer toolkit

bun.com

Headquarters: San Francisco, United States
Founded year: 2019
Company type: Private company
Number of employees: 2–20
Industry: Software

Last updated Today

Latest news about Bun

In short: Bun was acquired by Anthropic and completed a massive codebase migration from Zig to Rust using AI, according to recent developments.

Company announcements

July 8 Bun

Bun rewrites its runtime from Zig to Rust

The project used Claude Code and adversarial review to port over 535k lines of code in 11 days, and the test suite now passes on all platforms.

April 20 Bun

Bun releases v1.3.13

Introduces bun test --parallel, --isolate, --shard, --changed flags, streams tarballs with 17x less memory, optimizes source maps, upgrades JavaScriptCore.

April 9 Bun

Bun releases v1.3.12

Introduces Bun.WebView for headless browser automation, terminal Markdown rendering, in-process Bun.cron, async stack traces, and numerous performance improvements and bug fixes.

March 18 Bun

Bun releases v1.3.11

Introduces Bun.cron for cron jobs, Bun.sliceAnsi for string slicing, smaller Linux binary, and numerous bug fixes. Published March 18, 2026.

Media coverage

July 9 IBT

Claude Code Rewrote Bun From Zig to Rust in 11 Days, Proving the Code May Take Years

Anthropic's Claude Code helped rewrite Bun from Zig to Rust in 11 days, but developers say long-term maintainability will determine the project's success.

July 8 MSN

The surprising acquisition: Anthropic purchases Bun for AI projects

Anthropic's recent acquisition of Bun, a JavaScript runtime, raises questions about the future of software engineering and AI ...

June 1 MSN

Why Anthropic's purchase of Bun surprised everyone

In a surprise twist, Anthropic has acquired Bun, the popular JavaScript runtime, igniting discussions within the developer ...

May 14 The Register

Anthropic’s Bun Rust rewrite merged at speed of AI

A pull request with a Rust version of Anthropic’s Bun, a JavaScript toolkit and runtime originally written in Zig, has been merged to the main...

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