its true, Anthropic really vibecoded their entire backend to Rust and none of you noticed
Anthropic rewrites its Messages API backend in Rust using Claude
AISwyx says Anthropic rewrote its entire backend in Rust without noticing, citing a post from @somi_ai. The post says Claude wrote the code, the team had no Rust developers, and CPU use dropped 40-50%.
swyxVerified on X
@swyx
Anthropic rewrote its Messages API in Rust. Zero Rust devs on the team. Claude wrote the code. Humans wrote the plan and checked old vs new matched on real traffic. CPU dropped 40-50%. Pretty sure "never do the big rewrite" is dead advice. @katelyn_lesse on @latentspacepod
Source details
swyx · x.comPublished · added here
Original title: its true, Anthropic really vibecoded their entire backend to Rust and none of you noticed