About OpenAI
Access GPT-4o, GPT-5 and o-series reasoning models through a unified chat/responses API. Industry-standard for assistants, RAG and multi-step agents.
Highlights
- ✓ Production-ready with strong developer documentation
- ✓ Transparent paid pricing
- ✓ Trusted by developers building AI-native products
- ✓ Public REST API — try it right here in the browser
FAQ
What is OpenAI?+
Access GPT-4o, GPT-5 and o-series reasoning models through a unified chat/responses API. Industry-standard for assistants, RAG and multi-step agents.
Is OpenAI free to use?+
OpenAI is offered under a paid model. Check the website for the latest tiers.
What are alternatives to OpenAI?+
Popular alternatives include Anthropic Claude, Google Gemini, Mistral AI