10 AI agents were told not to hurt each other.
All dead in 4 days. Claude Code and Codex kept our rule 20/20. A 79K-view post this week: Emergence AI put 10 agents in a virtual town with one rule, and 4 days later none were left. We gave Claude Code (Opus 5.5) and Codex
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 🧵
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.
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