Elon Musk filed a new lawsuit against ChatGPT-maker OpenAI and its CEO, Sam Altman, reigniting the legal fight after appearing to drop the case in June, according to an Aug. 5 complaint filed in a United States federal court in California. Musk co-founded OpenAI alongside Altman in 2015 and sued the company in February for allegedly violating promises to operate as a non-profit. Musk filed a motion to drop his lawsuit in June after OpenAI published a blog post revealing some of Musk’s private exchanges at OpenAI. Related: X faces controversy over using user data for training AI chatbot Grok: R…