Boris Cherny, Head of Claude Code at Anthropic, just shared an official tip before Fable 5.5 ships The setup: split your workload across Opus 5.5, Sonnet 5.5, and Haiku 5.5, and let them talk directly across your open terminals Zero context pollution between windows: independent sessions ping each other via plain-text IPC over local sockets without burning a single token on conversation history You just launch Claude Code like this: claude --model sonnet --settings '{"crossSessionInbound":"accept"}' here's the split: → Opus 5.5 architects session permissions: audits ListAgents discovery, enforces inbound message policies, and signs off on multi-terminal diffs → Sonnet 5.5 executes code fixes: builds endpoints, updates schemas, and patches dependent code whenever a peer session reports a breaking change → Haiku 5.5 relays inter-session messages: processes SendMessage pings across terminals at 340 tok/s with zero history bloat and sub-millisecond local socket latency → you stop bur