GitHub's $120k Copilot Rust port: budget your own rewrite
GitHub ported the Copilot agent runtime from TypeScript to 832,378 lines of production Rust in about 14.5 weeks for roughly $120,000 in tokens plus three weeks of one developer's time, with a 96.22% prompt-cache hit rate and up to 18x faster in-process session startup. We break down the token bill into reusable unit costs, show why caching kept it around a sixth of the uncached price, and list the preconditions and EU residency checks to settle before budgeting your own agent-driven rewrite.
Spotify cut Claude Code tokens 90%: copy the pattern
Spotify routes bulk file reads and boilerplate generation out of Claude Code to a cheaper worker model, cutting Claude token usage on those reads by 90% in tests on a Java monorepo. The pattern needs no Portal licence: Claude Code hooks, two wrapper scripts and a flash-class model in Microsoft Foundry rebuild it inside your own Azure tenant, with the boundaries Spotify itself draws around editing and reasoning.