US tech mogul Sam Altman has vowed that his firm will deliver “much better models” in the future The Chinese-developed DeepSeek AI is an “impressive model,” OpenAI CEO and co-founder Sam Altman has admitted, vowing that his own company will deliver better alternatives in the future. The Hangzhou-based start-up released its AI Assistant app earlier this month, and by this week it had become the most downloaded free app on the US Apple App Store, surpassing OpenAI’s ChatGPT. DeepSeek’s rapid