OpenAI
The company behind ChatGPT, GPT-4o, and o1
paidPay per token
OpenAI provides the most widely used LLM API with GPT-4o, GPT-4o mini, o1 reasoning models, embeddings, DALL-E image generation, Whisper speech-to-text, and Assistants API.
Pros
- Most capable general-purpose LLM
- Huge ecosystem and SDK support
- Battle-tested at scale
- Best function calling reliability
Cons
- Most expensive at scale
- No free tier
- Rate limits can bite
- Vendor lock-in risk