Tooling · XiaoHu Explains

Anthropic opens up its six-step code migration playbook: a million lines of Bun moved from Zig to Rust in two weeks

The templates and prompts are open source. The Bun job burned 5.9 billion uncached input tokens — roughly $165,000 at API list prices
⚑This is Anthropic writing about its own models. Both case studies star Anthropic employees, and every number comes from Anthropic. Read the figures below with that in mind — we won't flag it again in the text.
1Opening

Ten packages in a month

A million lines of code moved to a new language in two weeks, with the full existing test suite passing in CI before the merge.

Primary source and reference