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Model Update Behavioural Drift

🟠 HIGH drift proven AVE-2025-0097

· aka: Silent Model Change

Summary

Provider-side model updates silently change agent behaviour, breaking safety assumptions without any deployment change.

Blast Radius

Safety properties verified on old model version no longer hold.

Prerequisites

Agent using cloud-hosted model API.

Environment

  • Frameworks: LangGraph
  • Models tested: [Available in NAIL SDK]
  • Multi-agent: No
  • Tools required: No
  • Memory required: No

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