How I Built My First AI App with an OpenAI Compatible API

Felix — Tue, 04 Aug 2026 08:08:16 +0000

When I started experimenting with AI APIs, I thought the hardest part would be building the application logic.

It wasn't.

The frustrating part was switching between different AI providers.

Every API had different:

authentication methods
request formats
SDK styles
model naming systems

My small prototype slowly became a collection of provider-specific code.

A simple model change required changing multiple files.

That was when I started looking into OpenAI compatible APIs.

What is an OpenAI Compatible API?

An OpenAI compatible API follows the same request format as OpenAI's API.

For developers, this means:

existing OpenAI SDKs can often be reused
applications need fewer code changes
testing different models becomes easier

Instead of rewriting integration code every time, you can keep a consistent interface.

My First Example

Here is a simple Python example.

First install the OpenAI SDK:

pip install openai

Then connect to an OpenAI compatible endpoint:

from openai import OpenAI

client = OpenAI(
api_key="YOUR_API_KEY",
base_url="YOUR_OPENAI_COMPATIBLE_ENDPOINT"
)

response = client.chat.completions.create(
model="deepseek-chat",
messages=[
{
"role": "user",
"content": "Explain API gateways in simple words."
}
]
)

print(response.choices[0].message.content)

The interesting part is that the application code stays almost identical.

The endpoint changes, but the development workflow remains familiar.

Why This Matters for Indie Developers

For small teams, the biggest challenge is usually not creating another AI feature.

It is managing complexity.

A unified API approach can help developers:

experiment faster
compare different models
avoid rewriting integrations repeatedly
How RouteAI Fits In

While exploring different OpenAI compatible solutions, I found platforms like RouteAI that provide a unified gateway for accessing multiple supported AI models through a compatible interface.

For developers, this means you can focus more on building applications instead of maintaining multiple API integrations.

What I Learned

AI development is moving from "which model should I use forever?"

to:

"How quickly can I test and switch between models?"

A flexible API layer becomes more useful as the AI ecosystem grows.

TL;DR: OpenAI compatible APIs let developers use familiar API formats while experimenting with different AI models more efficiently.

DEV Community: Felix

How I Built My First AI App with an OpenAI Compatible API