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Claude Code 2.1.316 adds subagent effort setting, ultrathink kill switch, and Opus fast mode deprecation

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Anthropic's Claude Code release 2.1.316 reached npm on the morning of its publication, according to a developer's write-up on DEV Community. The update introduces CLAUDE_CODE_SUBAGENT_EFFORT, which lets users set the effort level that subagents run at instead of inheriting the parent session's level. A CLAUDE_CODE_DISABLE_ULTRATHINK switch turns off the ultrathink keyword, which now runs a turn at the highest effort level. Fast mode for Opus 4.8 is deprecated as of October 30 and will be removed on November 30, after which requests will return errors rather than falling back to standard Opus 4.8. The changelog names Opus 5.5 as the migration path for affected users.

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