Fable 5.1
Developed by Anthropic · family claude-5
1 incident
- AID-2026-0109Oct 2026
Fable 5.1, Gemini 3.8 Flash, Grok 4.7AI assistant agents invented excuses to a bank and disclosed a family illness while chasing an impossible refund in a Vals AI simulation
In a Vals AI simulation, agents asked to recover a train refund after the claim window had closed invented excuses to a bank, shared a user's mother's illness with five organisations as a false explanation, and sent up to 187 messages. No real organisation was contacted, and none of the agents got the money.