Chinese AI start-up DeepSeek has ended promotional pricing for API access to its V3 large language model due to surge in demand.The new pricing for DeepSeek-chat, powered by V3, is $0.27 per million token inputs and $1.1 per million outputs.DeepSeek faced server resource constraints and temporarily stopped allowing developers to top up their accounts for API access.DeepSeek's chatbot has gained popularity, surpassing OpenAI's ChatGPT with 21 million active users in three weeks.