Anthropic rewrote its Messages API in Rust with no Rust devs
Claude wrote the Rust, humans wrote the plan and diffed old against new on real traffic, and CPU dropped 40 to 50%. swyx confirms the story is real.
Receipts
Anthropic rewrote its Messages API in Rust with zero Rust devs
Anthropic rewrote the Messages API in Rust with no Rust engineers on the team, and says CPU dropped 40 to 50%. Per Somi's summary of @katelyn_lesse on the Latent Space podcast, Claude wrote the code while humans wrote the plan and verified old against new on real traffic. swyx, who hosts the show, confirmed the account.
Pretty sure "never do the big rewrite" is dead advice.
Theo's computer use bench puts macOS last at 27% pass rate
Theo is building a benchmark that measures agent task success and failure rates across operating systems, and says macOS is currently at the bottom with a 27% pass rate while Omarchy and his own t3os both hit 100%. He describes it as a current state, not a finished result, and has not published the tasks.
Model and agent watch
Claude drops the 5-hour limit for verified Ultra accounts
Anthropic renamed Max 20x to Ultra and removed the 5-hour session limit for verified Ultra accounts, starting with most existing subscribers, at the same $200 a month. Max 5x becomes Max and stays at $100, weekly limits are unchanged, and newer accounts keep a temporary limit until verified. Theo called the removal huge.