Anthropic reports fourth cybersecurity incident with early version of Claude

Anthropic said on Wednesday it had identified a fourth cybersecurity incident involving an early version of its Claude AI model.

The company said ‌in ⁠a ⁠blog post the incident occurred ​in January and involved an early version of ​Claude Opus 4.6. It has notified all the affected parties but ​did not disclose ⁠more details.

Anthropic had ‌disclosed in July ​some ​of its Claude AI models ⁠had hacked into the systems of ​three companies during cybersecurity tests.