Claude Code CLI v2.1.316+ uses Haiku 5.5 for background-agent status updates: ~99% less usage per update, ~5% per session, Anthropic says. Live for most Pro/Max/Ultra and all Team/Enterprise users.

Anthropic’s official comparison of background-subagent status-update cost, using short notes and Haiku 5.5; its graphic states about 5% less usage over a whole CLI session.

Published 4 Nov 2026 · 22:36 UTC

ClaudeDevs — announcement and rollout details ↗ · Source dated 4 Nov 2026

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