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Claude Code's background subagents update their status line every 30 seconds, and previously each update required re-reading the entire conversation. Claude Devs announced on November 5, 2026 that status lines are now generated by Haiku 5.5 from brief notes, reducing the cost of each update by about 99%, while the subagents themselves still use their own models. Usage for sessions containing background subagents is reduced by about 5%, and the same quota can run about 6% more prompts. The feature is available to most Pro, Max, and Ultra users and all Team and Enterprise users, and requires upgrading to v2.1.316+.
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Claude Code background subagents now use Haiku 5.5 to write status linesDevelopments
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Nov 5
Claude DevsFirst-party
Claude Code background subagents now use Haiku 5.5 to write status lines
Claude Code's background subagents update their status line every 30 seconds, and previously each update required re-reading the entire conversation. Now Haiku 5.5 generates the status line from brief notes, reducing the cost of each update by about 99%, while the subagents themselves still use their own models. Usage for sessions that include background subagents drops by about 5%, allowing roughly 6% more prompts within the same quota; the feature is available to most Pro, Max, and Ultra users and all Team and Enterprise users, and requires upgrading to v2.1.316+.