Part 9/11:
Flexible API tools: Developers can now utilize plain text inputs, structured outputs, and detailed controls over verbosity and response behavior, empowering a new wave of custom applications.
Pricing and availability: Starting at just $1.25–$25 per million input tokens, GPT-5 is more affordable than ever, with Nano tailored for cost-sensitive applications. Free users receive limited GPT-5 access, while pro users enjoy unlimited use and extended reasoning.