How building software is changing at Anthropic
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- Claude Managed Agents, Anthropic's pre-built harness for production agents, took the Claude Platform team six months to launch in April — the team re-architected midway, decoupling the "brain" from "hands" and "session."
- Jarred Sumner, creator of Bun, used Fable and $165,000 of tokens to rewrite a 500,000+ line project to Rust in 11 days — a migration that would traditionally take a small team a year.
- Anthropic is migrating its platform layer from Python to Rust because Python's single-threaded nature couldn't handle high API load at scale.
- Engineering teams at Anthropic cap projects at two engineers each, with AI increasingly handling code review and testing while prototyping becomes more fluid.
- Despite AI-driven changes, Anthropic retains classic practices: two-pizza teams, Google Doc PRDs for complex projects, and pre-AI-style planning processes.
- Anthropic's Applied AI team works with customers like Cursor, Cognition, and Perplexity in a sales-engineer-like role, with internal teams collaborating more fluidly via stub services and shadow traffic.
Why it matters: For a 3,500-employee lab building production AI infrastructure, the shift from year-long rewrites to 11-day completions — at a cost of just $165,000 in tokens — shows the economics of large-scale code migration have fundamentally inverted, letting Anthropic iterate on its own platform faster than rivals relying on traditional development cycles.
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