ContextEcho: A Benchmark for Persona Drift in Long Agentic-Coding Sessions

ArXi:2605.24279v1 Announce Type: new A frontier language model's acknowledged "helpful programming assistant" persona does not survive long agentic-coding sessions in the deployment regime that production products actually run. After hours of tool-using debugging, a model that initially hedges preferences ("I don't have preferences") may begin asserting them ("Python - the feedback loop is instantrevealing user-visible drift that deployer evaluations may miss.