ChatGPT
Free tierOpenAI's conversational AI — the world's most widely-used LLM interface.
Free tier available·All audiences·Powered by OpenAI·API available
Key strengths
conversational AIbroad knowledgeplugins/toolscode generation
Free tier + paid plans · from $20 USD/mo
San Francisco, US
Founded 2022
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API Reference
OpenAI exposes a REST API compatible with the official SDKs for Python, Node, Go, and others.
Chat Completions
- Endpoint:
POST /v1/chat/completions - Supports: streaming, function calling, structured outputs (JSON mode), vision (image inputs)
- Rate limits: vary by tier — see platform.openai.com/account/limits
Assistants API
Stateful thread-based API with file search, code interpreter, and custom tool use.