Anthropic Acquires JavaScript Runtime Bun as Claude Code Reaches $1 Billion Run-Rate Revenue

AI company Anthropic acquired JavaScript runtime Bun to accelerate its Claude Code product, which hit a $1 billion revenue run-rate just six months after its May 2025 launch. The deal, Anthropic's first, aims to improve performance for enterprise clients like Netflix and Spotify. Backed by major investments, Anthropic targets a $9 billion company run-rate by year-end, competing directly with OpenAI and Google in the enterprise AI market.

Claude Code revenue milestone

• ▪The $1 billion run-rate milestone was achieved six months after Claude Code's public launch in May 2025.
• ▪Anthropic's AI coding tool, Claude Code, reached a $1 billion annualized revenue run-rate in November 2025.

Enterprise customer concentration

• ▪Major enterprises using Claude Code include Netflix, Spotify, Salesforce, KPMG, and L'Oreal.
• ▪Enterprise customers generate approximately 80% of Claude Code's revenue.

Bun acquisition integration

• ▪Bun has over 7 million monthly downloads and has earned over 82,000 stars on GitHub.
• ▪Anthropic has committed to keeping Bun open source and MIT-licensed following the acquisition.
• ▪The acquisition is intended to improve Claude Code's performance, stability, and capabilities, as Anthropic was already using Bun's technology.
• ▪Bun, founded by Jarred Sumner in 2021, is an all-in-one JavaScript and TypeScript toolkit.
• ▪AI company Anthropic acquired JavaScript runtime startup Bun, marking its first-ever acquisition.
• ▪The financial terms of the acquisition of Bun by Anthropic were not publicly disclosed.

Snowflake partnership expansion

• ▪Anthropic has a $200 million partnership with Snowflake to integrate agentic AI directly with customer data.
• ▪The Snowflake partnership includes joint go-to-market teams that bundle services into existing customer renewals.

Competitive positioning risks

• ▪Anthropic has a separate commitment to spend $30 billion on Microsoft's cloud services.
• ▪Microsoft and Nvidia have announced plans to invest up to $15 billion in Anthropic.
• ▪Anthropic, founded in 2021 by former OpenAI staff, competes with OpenAI's Copilot and Google's Gemini.
• ▪CEO Dario Amodei stated Anthropic avoids overextending on infrastructure, unlike some rivals who are "YOLOing" capital without stable contracts.

Financial growth projections

• ▪The company is targeting a $9 billion run-rate by the end of 2025.
• ▪Anthropic's total company annualized run-rate grew from $1 billion in 2024 to approximately $7 billion by October 2025.
• ▪Internal documents project revenue goals of $20-26 billion for 2026 and up to $70 billion by 2028.