Short answers, pulled from the story.
Bun uses Safari's JavaScriptCore engine instead of the V8 engine that powers Chrome, Node.js, and Deno. This architectural choice was made by creator Jarred Sumner to achieve performance gains that dominant engines could not match.
The first stable release of Bun version 1.0 arrived on the 8th of September 2023. This release marked a pivotal moment in the history of web development tools and declared independence for a new ecosystem prioritizing raw speed and developer experience.
Jarred Sumner announced that Bun had been acquired by Anthropic on the 2nd of December 2025. The acquisition was a strategic partnership designed to integrate Bun's capabilities with Anthropic's AI tools, specifically Claude Code and the Claude Agent SDK.
On the 24th of August 2022, the company behind Bun, then known as Oven, announced a $7 million funding round led by Kleiner Perkins. Industry heavyweights like Guillermo Rauch and Y Combinator participated in this financial injection to accelerate development.
The 1.1 update brought critical support for Windows 10 and Windows 11, introducing a cross-platform Bun Shell that allows users to run Bash commands without the heavy overhead of traditional shells.