The Ledger
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Cherny: Bun codebase was rewritten to Rust in 11 days using Claude
“And he had the model rewrite it from Zig to Rust. It was one prompt. It was a dynamic workflow, and a dynamic workflows are a feature in quad code that essentially let you orchestrate, you know, dozens, 100,000 of agents to do work productively. And it ran for…”
Anthropic Deleted 80% of Claude Code System Prompt for Opus 5
“So yeah, we deleted 80% of the system prompt.”
Cherny: Claude Code runs in production on Bun's AI-rewritten Rust codebase
“This is in production now. This is what quad code uses now when you're running it.”
NASA JPL used Claude Code to navigate the Perseverance Mars rover
“It plotted the course for perseverance, like for like the Mars Rover.”
SemiAnalysis reports Claude Code generates four percent of all public commits
“There were some other stuff from like semi-analysis that four percent of all public commits are made by quad code.”
French-Owen: Claude Code and Codex Use Grep Rather Than Semantic Embeddings
“Like I think cursor takes an approach where they actually do semantic search, where they embed everything and figure out like, Hey, what query is closest to this? If you look at a codex or a cloud code they actually just use like grep.”
Cherny: Claude Code uses Bun sandboxes to orchestrate dynamic agent workflows
“What a dynamic workflow is, is essentially we have the Bun runtime. We use Bun as a sandbox, and we start a virtual machine within Bun, and we let Cloud start a lot of agents and orchestrate them.”
French-Owen: Claude Code spawns Haiku sub-agents with dedicated context windows
“When you ask Claude code to do something, it will typically spawn and explore sub agent or like multiple ones. And basically each of those are running haiku to traverse the file system and kind of like explore what's there. And they're doing it in their own co…”