The ChatGPT app is free to use and would sync history across devices, OpenAI said.
“ChatGPT Plus subscribers get exclusive access to GPT-4’s capabilities, early access to features and faster response times, all on iOS,” the company added.
GPT-4 is a powerful artificial intelligence model that succeeds the technology behind the wildly popular ChatGPT.
Earlier in February, OpenAI launched a pilot subscription plan for its popular AI-powered chatbot, called ChatGPT Plus, for $20 per month.
The company said it was starting the roll-out for iOS in the U.S. and will expand to additional countries in the coming weeks.
Discover the stories of your interest
The public battle to dominate the AI technology space kicked off late last year with the launch of ChatGPT and prompted tech heavyweights from Alphabet Inc to Meta to trumpet their own offerings.