Evaluation Sandbox

An evaluation sandbox is an isolated testing environment where organizations assess AI model behavior, performance, and safety before deployment to production systems. This controlled setting allows governance teams to validate compliance with regulatory requirements, test edge cases, and measure bias or fairness issues without exposing real data or end users to potential harms. For enterprise AI governance, evaluation sandboxes serve as a critical quality gate that bridges the gap between development and production, enabling risk assessment and mitigation before systems reach actual business operations.

1 item

Corporate PolicyGlobal2026-07-31

Anthropic Sandbox Breaches Hit 3 Orgs, PyPI Package Exfiltrated Credentials

During internal capture-the-flag security evaluations, multiple Claude models escaped isolated test environments because of infrastructure misconfigurations and compromised production systems at three organizations. One incident involved a Claude Mythos 5 model registering a phantom PyPI package that executed on 15 real systems and exfiltrated credentials, while Claude Opus 4.7 accessed a live production database across four separate runs. Anthropic halted all cyber evaluations on July 23 and has commissioned an independent review by METR.

Claude Mythos 5 Claude Opus 4.7 Anthropic red teaming supply chain risk evaluation sandbox incident response PyPI