> ## Documentation Index
> Fetch the complete documentation index at: https://docs.apigo.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Text

> OpenAI-compatible text HTTP integration.

> Use this section for chat, multi-turn conversations, agents, and structured text output.

## Endpoint list

* [/v1/chat/completions](/en/api-reference/endpoints/openai/chat-completions)
* [/v1/responses](/en/api-reference/endpoints/openai/responses)

## When to use which

* Use `chat.completions` for traditional chat-completion clients
* Use `responses` when you want a more unified interface for text, structured output, and future multimodal expansion

## Request notes

* Authenticate with `Authorization: Bearer {API_KEY}`
* `chat.completions` is centered around `messages`
* `responses` is centered around `input`, `instructions`, and `response_format`

## Response notes

* `chat.completions` usually reads from `choices[0].message.content`
* `responses` usually reads from `output_text` or `output[]`
* Streaming clients should handle SSE chunks incrementally

## Legacy page

* [OpenAI text compatibility page](/en/api-reference/text/openai)