Claude Code 2.1.316: subagent effort becomes a setting, ultrathink gets a kill switch, and Opus fast mode has 30 days left

<p>Claude Code 2.1.316 hit npm at 00:42 UTC this morning. I read the <a href="https://code.claude.com/docs/en/changelog" rel="noopener noreferrer">changelog</a> over coffee because this release touches the three things I care about most in an agent config: what effort level subagents run at, what the ultrathink keyword costs, and which model settings quietly carry an expiry date.</p> <p>One number

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