Open Source · backend

Use Baichuan 4 with FastAPI

Updated 2026-05-21 · By XALEN

How to use Baichuan 4 (Open Source, ~130B) with FastAPI. Install, authenticate, and make your first API call in minutes. Working code example included.

Model

Baichuan 4

~130B · 128K context · $0.05 input

Framework

FastAPI

backend · pip install xalen fastapi uvicorn

1. Install

pip install xalen fastapi uvicorn

2. Code

from fastapi import FastAPI
from pydantic import BaseModel
from xalen import XALEN

app = FastAPI()
client = XALEN(api_key="xln_test_YOUR_KEY")

class ChatRequest(BaseModel):
    messages: list

@app.post("/chat")
async def chat(req: ChatRequest):
    response = client.chat.completions.create(
        model="baichuan-4",
        messages=[m.dict() for m in req.messages]
    )
    return {"reply": response.choices[0].message.content}

Baichuan 4 with Other Frameworks

Python JavaScript React Next.js Flask Django Express.js Flutter

Other Models with FastAPI

Vedika Standard Vedika Fast Vedika Pro Ultra Vedika Vision Vedika Code Vedika Pandit Voice

200+ models. One API. Works with any framework.

Get API Key

Last updated: 2026-05-21