I ran the same 5 Claude Code sessions four ways, every step graded by hidden tests.Opus (the default)

$4.14effortless on Opus: $3.87Sonnet high: $2.14AutoMode: $2.01All four passed 20/20. Here's what AutoMode does differently 🧵

Alex IvyNov 5

Background subagents in Claude Code now use less of your usage limit.

A running subagent updates its status line every 30 seconds, and each update used to re-read its whole conversation. Now Haiku 5.5 writes it from short notes instead, so each update costs about 99% less.

ClaudeDevsNov 422K