# OpenAI and Objects

This section collects OpenAI-compatible capabilities, shared object structures, and base model notes.

## OpenAI Compatibility

- [All chat models are compatible with OpenAI format](/en/api/openai-compatible-chat-models)
- [All OpenAI-format LLM models support the official Claude format](/en/api/doc-7327090)
- [Realtime](/en/api/realtime)
- [Responses API vs Chat API](/en/api/responses-vs-chat)
- [GPTs Introduction](/en/api/gpts-intro)

## Objects and Structures

- [Chat Completion Object](/en/api/chat-completion-object)
- [Chat Completion Chunk Object](/en/api/chat-completion-chunk-object)
- [Embedding Object](/en/api/doc-3530858)
- [File Object](/en/api/doc-3530862)

## Model Capabilities

- [Visual Language Model Introduction](/en/api/vision-language-models)