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Public story · 2026-07-27 · high
The same build swapped in Opus 5 as the default model and added a new network sandbox control, so headless jobs should pin a version.
Why now: The 2026-07-27 coverage caught v2.1.219 and the v2.1.220 patch that followed it within a day.
Claude Code swapped Opus 5 in as its default model in v2.1.219, per the release notes. Anthropic followed it with v2.1.220, a pure reliability patch, 18 hours and 53 minutes later, per havoptic's tracking. Teams running Claude Code headless in a scheduled job inherited a new default model and a same-day fix before they noticed the version bump.
The same build added sandbox.network.strictAllowlist, a setting for tighter control over what an agent's sandbox can reach on the network, per the release notes.
It also shipped a DirectoryAdded hook that fires when a new working directory registers mid-session, useful for scripting multi-directory agent runs.
In stream-json output, subagent text now forwards through a new --forward-subagent-text flag, so nested subagent output doesn't get dropped.
Dynamic workflows default to a guideline of fewer than 15 agents too, per the notes.
The bundling is the real risk, not the patch speed. The strictAllowlist setting and the Opus 5 default swap shipped in the same build, so rolling back v2.1.219 to fix one means losing the other.
Each link below shares sources, entities, or timing with this story.
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