Update: A day later, GPT-6 Astra is rolling out to Business and Pro customers on the $100/month or $200/month plan. This follows other new model releases before Plus customers on the $20/month plan gain access. Update #2: A few hours later, Plus users with the $20/month subscription now have Astra access as well. It’s been just over a year since OpenAI released the first GPT-5 models for ChatGPT.