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bun-04e1cd3a·5 events·first seen Aliases: Bun
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Claude Code runtime migrated to Bun (written in Rust)
A Simon Willison post (surfaced via Hacker News with 173 points and 229 comments) notes that Anthropic's Claude Code agentic coding tool now uses Bun as its JavaScript runtime, which is itself implemented in Zig/Rust. The change is an infrastructure/tooling detail about the Claude Code execution environment. Community engagement suggests this is a notable implementation detail for practitioners using or building on Claude Code.
Claude Code now uses a Bun runtime written in Rust
Simon Willison notes that Claude Code has switched to using Bun (a JavaScript runtime) implemented in Rust as part of its execution stack. The post is brief but signals an infrastructure change in Anthropic's Claude Code agentic coding tool. This is relevant for practitioners tracking the internals and performance characteristics of Claude Code.
Claude Code 2.1.181 release: /config syntax, Apple Events sandbox, subagent improvements, and ~40 bug fixes
Anthropic released Claude Code version 2.1.181 with several new features including a /config key=value prompt syntax for setting any configuration option, an opt-in Apple Events sandbox permission on macOS, and a new CLAUDE_CLIENT_PRESENCE_FILE environment variable for suppressing mobile push notifications. The release also includes improvements to subagent panel UX (auto-hide, depth limits, elapsed time fixes), streaming of long paragraphs, and auto-retry on mid-thinking connection drops. Approximately 40 bug fixes address issues ranging from 0-byte file writes on network drives, macOS TUI freezes, startup regressions, and credential refresh loops.
Anthropic Acquires Bun JavaScript Runtime as Claude Code Hits $1B ARR
Anthropic has acquired Bun, the high-performance JavaScript runtime and all-in-one toolchain founded by Jarred Sumner in 2021, to accelerate Claude Code's infrastructure. Claude Code reached $1 billion in annualized run-rate revenue in November 2025, just six months after its May 2025 general availability launch. The acquisition deepens an existing partnership—Bun was already integral to Claude Code's infrastructure scaling and its native installer launch. Bun will remain open source and MIT-licensed, with Anthropic committing continued investment in the project.
Anthropic Acquires Vercept to Advance Claude's Computer Use Capabilities
Anthropic has acquired Vercept, a team specializing in AI perception and interaction for computer use tasks, whose co-founders include Kiana Ehsani, Luca Weihs, and Ross Girshick. Vercept will wind down its external product and join Anthropic to push computer use capabilities further. The announcement coincides with the launch of Claude Sonnet 4.6, which achieved 72.5% on the OSWorld benchmark—up from under 15% in late 2024—approaching human-level performance on tasks like navigating spreadsheets and completing web forms. This follows Anthropic's earlier acquisition of Bun and is part of a broader strategy to build agentic, multi-step task capabilities into Claude.