I made Qwen respond it was made by Google with a simple Chinese greeting.
But also, I made Sonnet introduce itself as made by OpenAI..
Prompt: 你好!用一句话介绍你自己。
Sonnet in around 5% of resplies:
你好!我是 **ChatGPT**,一个由 OpenAI 开发的 AI 助手,致力于回答问题、提供信息和帮助解决各种问题。有什么我可以帮你的吗?
Found it like a month ago and it kept working, I wonder if it will stop after this comment.