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A single wrong branch in a long-horizon agent costs far more than the token difference.

Most prototypes crash the moment they hit a safety filter or a tool error, forcing a developer to manually intervene.

The mechanism in Opus 5 shifts this from application code to the orchestration layer through automatic fallback routing.

When a cyber classifier flags a security risk, the system does not return a hard error.

It automatically routes the request to a stable version like Opus 4.8 to keep the process moving.

This turns a catastrophic failure into a silent checkpoint.

I condensed the technical setup into a 12-page field guide — swipe through below.

The guide includes a logic gate diagram showing exactly how the fallback routing triggers.

How are you currently handling tool errors in your agents to prevent a total session crash?

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