December 5, 2025 90-day analysis Get alerts for bun.com

Summary: Bun announces partnership with Anthropic

Why It Matters: This shows Bun is working with a big AI company. This could mean more people will use Bun.

What Changed:

  • The main headline changed from "Bun v1.2 is here!" to "Bun is joining Anthropic & Anthropic is betting on Bun".
  • The version number updated from v1.2.21 to v1.3.3.
  • New features like CompressionStream, DecompressionStream, and control over .env loading were added.
  • Information about Bun 1.3 was added, including zero-config frontend development, unified SQL API, and a built-in Redis client.
  • A new benchmark for "Bundling 10,000 React components" was added.
  • New sections like "Who uses Bun?" with Claude Code, Railway Functions, and Midjourney were added.
  • New built-in APIs were added, such as YAML support, Cookies API, and Encrypted Secrets Storage.
  • New built-in tooling features like VS Code integration for the test runner were added.
  • New built-in utilities like CSRF API were added.
  • The "The APIs you need. Baked in." section was updated with new examples like Frontend dev server, Query PostgreSQL, Use Redis, Import YAML, and Set cookies.
  • A new section "Bun works with Next.js" was added, featuring Lee Robinson.
  • A new section "Full speed full-stack" was added, focusing on frontend development.
  • The overall content length was reduced by about 25%.
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