OpenAI
The AI lab behind ChatGPT and the GPT model family; Anthropic's main commercial competitor.
Definition
OpenAI ships the GPT model family (GPT-4o, GPT-5, o-series reasoning models) and consumer products including ChatGPT, ChatGPT Search, and Codex. Its API is the second-most-common LLM backend in production after Anthropic. Most automation platforms (n8n, Make, Zapier) include OpenAI nodes for both completion and embedding endpoints.
When to use
See also
- ChatGPT — OpenAI's consumer LLM product — chat, browse, and run plugins on the web via GPT-class models.
- Anthropic — The AI safety company behind the Claude model family, Claude Code, the MCP protocol, and the Agent SDK.
- Gemini — Google's flagship multimodal LLM family powering the Gemini app, Vertex AI, AI Overviews, and Search.