Claude Just Migrated 750K Lines In 11 Days (Bun Got Rewritten Zig → Rust)

Bun — the JavaScript runtime — was rewritten in a completely different language by Claude in 11 days. 750,000 lines of brand new Rust code. 99.8% test pass rate. 2,188 files. Merged to main on May 14. This is the most important AI engineering story of 2026 and almost nobody is talking about it.

What you'll learn:
✅ The full timeline — May 3 first commit to May 14 merged
✅ Why Anthropic acquired Bun in Dec 2025 (and why it matters)
✅ How Claude Opus 4.8 dynamic workflows orchestrated hundreds of parallel agents
✅ The Phase A / Phase B architecture trick that made it possible
✅ What this means for YOUR legacy codebase
✅ The 3 things you need before AI can migrate your code
✅ The uncomfortable question — could your codebase be next?

Timestamps:
0:00 The story that broke my brain
0:50 99.8% test pass · 750K lines · 11 days
1:30 The backstory — Anthropic acquired Bun
2:15 How dynamic workflows actually worked
3:10 Phase A vs Phase B architecture
4:00 What this means for YOUR codebase
4:50 Could your codebase be next?
5:25 3 takeaways · write tests, modularize, get curious
5:55 Outro

📺 Other recent breaking dev episodes:
• Apple put Claude in Siri: https://www.youtube.com/watch?v=YqCbgEniqmA
• Anthropic split your bill: https://www.youtube.com/watch?v=S-Ic3CAJXXk
• Fable 5 SHUT DOWN: https://www.youtube.com/watch?v=TSsEq35wZ-w

Subscribe for honest AI/dev breaking news with action plans.

#Bun #ClaudeOpus #JarredSumner #DynamicWorkflows #ZigToRust #AICoding #AnthropicBun #ClaudeCode #LegacyMigration #Rust #JavaScriptRuntime

Видео Claude Just Migrated 750K Lines In 11 Days (Bun Got Rewritten Zig → Rust) канала Tech with RKM