kral Documentation
Sign in
API

API Quickstart

The kral API is OpenAI-compatible: existing SDKs keep working, you only swap the base URL and the key. Through the same interface you reach every model — Claude, GPT, Gemini, Grok, Mistral, Llama.

1. Create an API key

In the dashboard under API keys, click New. One key per project, with its own daily or monthly spend limit. Keys start with sk-kral-. The plain-text key is shown once at creation; afterwards only the prefix.

2. Set the base URL

https://api.kral.ai/v1

Authentication is a Bearer token in the Authorization header.

3. First request

cURL

curl https://api.kral.ai/v1/chat/completions \
  -H "Authorization: Bearer $KRAL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-6",
    "messages": [
      {"role": "user", "content": "Hello"}
    ]
  }'

Python

from openai import OpenAI

client = OpenAI(
    base_url="https://api.kral.ai/v1",
    api_key="sk-kral-...",
)

resp = client.chat.completions.create(
    model="claude-sonnet-4-6",
    messages=[{"role": "user", "content": "Hello"}],
)
print(resp.choices[0].message.content)

Node.js

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.kral.ai/v1",
  apiKey: process.env.KRAL_API_KEY,
});

const resp = await client.chat.completions.create({
  model: "gpt-5",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(resp.choices[0].message.content);

Models

Pass the model name in the model field. Get the full list with GET /v1/models. More under Endpoints.

Next