What is OpenAI API?
The OpenAI API provides access to GPT and reasoning models plus image generation, speech, embeddings and the Responses and Agents tooling. It's the most widely used foundation model platform for building AI products.
Best for: Developers, Startups, Enterprises.
Key features
- GPT and reasoning models
- Responses API
- Realtime voice
- Image generation
- Agents SDK
Pros and cons
Pros
- Broadest ecosystem and documentation
- Strong multimodal capabilities
Cons
- Usage costs can grow quickly
- Model deprecations require upkeep
OpenAI API pricing
| Pricing model | Paid |
|---|---|
| Starting price | See website |
| Platforms | API |
| Launched | 2020 |
Prices change often. Check the OpenAI API website for current plans.
Our verdict
OpenAI API scores 9.5/10 in our review. Its biggest strength: broadest ecosystem and documentation. The main drawback: usage costs can grow quickly. If it isn't the right fit, Anthropic API is the closest alternative.
OpenAI API compared
Frequently asked questions
What is OpenAI API?
The OpenAI API provides access to GPT and reasoning models plus image generation, speech, embeddings and the Responses and Agents tooling. It's the most widely used foundation model platform for building AI products.
Is OpenAI API free?
No. OpenAI API is a paid tool.
What are the best OpenAI API alternatives?
Popular alternatives include Anthropic API, Google Gemini API, Hugging Face, n8n.
Who is OpenAI API best for?
OpenAI API is best for developers, startups, enterprises.