API Documentation

Base URL & Authentication

Every request needs your Lain API key (create one from your dashboard) as a Bearer token.

Base URL:      https://lain-os.com/v1
Authorization: Bearer lain_xxxxxxxxxxxxxxxxxxxx

List models

GET https://lain-os.com/v1/models

curl

curl https://lain-os.com/v1/chat/completions \
  -H "Authorization: Bearer lain_xxx" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "lain-free",
    "messages": [
      {"role": "user", "content": "Hello"}
    ]
  }'

Python (OpenAI SDK)

from openai import OpenAI

client = OpenAI(
    api_key="lain_xxx",
    base_url="https://lain-os.com/v1",
)

response = client.chat.completions.create(
    model="lain-free",
    messages=[{"role": "user", "content": "Hello"}],
)
print(response.choices[0].message.content)

JavaScript (openai SDK)

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: "lain_xxx",
  baseURL: "https://lain-os.com/v1",
});

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

Lain OS TUI

Run lain and paste your API key when it asks — it's saved for next time. To set it by hand instead, put this in the TUI's .env:

LAINOS_MODEL_PROVIDER=lain
LAIN_API_KEY=lain_xxx