GPT-5.6-Sol get's stuck for hours

A user reports that OpenAI's GPT-5.6-Sol Ultra frequently gets stuck for hours, requiring manual intervention, and that sub-agents that never return are not recognized as dead by the system.

GPT-5.6-Sol Ultra get's stuck all the time and I manually have to stop it. 😔 It even got "stuck" for more than 10 hours. It seems sub agents that never return are not recognized as death by Sol. ChatGPT OpenAI https://t.co/1tfOGFKflv