Overview

Infron supports the OpenResponses API specification, an open standard for AI model interactions. OpenResponses provides a unified interface across providers with built-in support for streaming, tool calling, reasoning, and multi-modal inputs.

Base URL

The OpenResponses-compatible API is available at:

https://llm.onerouter.pro/v1

Authentication

The OpenAI-compatible API supports the same authentication methods:

• API key: Use your Infron API key with the Authorization: Bearer <token> header

Supported features

The OpenResponses API supports the following features:

• Text generation - Generate text responses from prompts

• Streaming - Stream tokens as they're generated

• Image input - Send images for analysis

• Tool calling - Define tools the model can call

Supported endpoints

The Infron supports the following OpenResponses endpoint:

• POST /responses - Create chat response with support for streaming, attachments, tool calls, and structured outputs

Getting started

Here's a simple example to generate a text response:

Python

import requests

response = requests.post(
    'https://llm.onerouter.pro/v1/responses',
    headers={
        'Authorization': 'Bearer <API_KEY>',
        'Content-Type': 'application/json',
    },
    json={
        'model': 'o4-mini',
        'input': 'Hello, world!',
    }
)

TypeScript

cURL

Parameters

Required parameters

• model (string): The model ID in provider/model format (e.g., openai/gpt-5.2, anthropic/claude-sonnet-4.5)

• input (array): Array of message objects containing type, role, and content fields

Optional parameters

• stream (boolean): Stream the response. Defaults to false

• temperature (number): Controls randomness. Range: 0-2

• top_p (number): Nucleus sampling. Range: 0-1

• max_output_tokens (integer): Maximum tokens to generate

• tools (array): Tool definitions for function calling

• tool_choice (string): Tool selection mode: auto, required, or none

• reasoning (object): Reasoning configuration with effort level

• provider (object): Provider routing and configuration options

Error handling

The API returns standard HTTP status codes and error responses:

Common error codes

• 400: Bad Request (invalid or missing params, CORS)

• 401: Invalid credentials (OAuth session expired, disabled/invalid API key)

• 402: Your account or API key has insufficient credits. Add more credits and retry the request.

• 403: Your chosen model requires moderation and your input was flagged

• 408: Your request timed out

• 429: You are being rate limited

• 502: Your chosen model is down or we received an invalid response from it

• 503: There is no available model provider that meets your routing requirements

Error response format

{
    "error": {
        "message": "",
        "type": "",
        "param": "",
        "code": 429
    }
}