Anthropic rewrote its Messages API in Rust with zero Rust devs — Claude wrote the code, CPU down 40-50%
matt_slotnick · x · 2026-10-31
Anthropic rewrote its core Messages API in Rust with zero Rust developers on the team: Claude wrote the code while humans wrote the plan and verified old-vs-new behavior on real traffic, cutting CPU usage by 40-50%. Commentators note the feat — a successful big rewrite of a core, scaled service — signals 'never do the big rewrite' is dead advice. Source: katelynlesse on the Latent Space podcast.
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