Anthropic buys Bun to supercharge its AI coding tools
Anthropic has acquired Bun, the fast growing developer tooling startup, in a bid to speed up and stabilise its AI coding agent, Claude Code.
The deal, reported by Reuters, marks one of Anthropic’s most direct moves into the software infrastructure that underpins modern development teams.
Bun has been part of Anthropic’s workflow for months and will now be formally folded into the company. Claude Code, which became generally available in May, has already reached a $1 billion annualised revenue run rate and is being used by large enterprises including Netflix, Spotify and Salesforce.
Anthropic says Bun will be “instrumental in helping us build the infrastructure for the next generation of software.”
Founded in 2021 by Jarred Sumner, Bun offers an all in one toolkit that combines a code runtime, package manager, bundler and test runner. Financial terms of the acquisition were not disclosed, but the move signals Anthropic’s ambition to build deeper foundations for its developer products rather than rely solely on model performance.
The company is scaling quickly with the help of heavyweight backers. Microsoft and Nvidia recently outlined plans to invest up to $15 billion in Anthropic, while Anthropic itself has committed $30 billion to using Microsoft’s cloud services.
The startup, founded in 2021 by former OpenAI employees, was recently valued at $183 billion and has become one of OpenAI’s most serious competitors in the enterprise market.
Anthropic’s bet is that controlling more of the coding stack will help Claude Code evolve from a clever assistant into the backbone of software engineering workflows. Whether it can pull that off will hinge on how smoothly Bun slots into the machine.
