OpenAI-Compatible APIs: What They Are and Why They Matter

What "OpenAI-Compatible" Means

An OpenAI-compatible API uses the same request format, same response format, and same SDKs as OpenAI. The only difference: the base URL and API key.

If your code works with OpenAI, it works with any compatible provider. No rewrite needed.

Why This Matters

• •No vendor lock-in. Switch providers without touching application code.
• •Use any SDK. Python openai, JavaScript OpenAI library, LangChain, Vercel AI SDK, cURL. All work.
• •Access open-source models. Models like DeepSeek V3, Qwen 3.6, and Gemma 4 are competitive with GPT-4 at a fraction of the cost.

The 2-Line Migration

Moving from OpenAI to an open-source model through Kyma takes exactly 2 changes:

from openai import OpenAI

client = OpenAI()  # uses api.openai.com

response = client.chat.completions.create(
    model="gpt-4o",
    messages=[{"role": "user", "content": "Hello"}],
)

from openai import OpenAI

client = OpenAI(
    base_url="https://kymaapi.com/v1",  # ← change 1
    api_key="kyma-your-key",               # ← change 2
)

response = client.chat.completions.create(
    model="qwen-3.6-plus",  # open-source, GPT-4 class
    messages=[{"role": "user", "content": "Hello"}],
)

Same code structure. Same SDK. Same response format. Different model, different price.

What Tools Support This

Any tool that lets you set a custom base URL works with OpenAI-compatible APIs:

Active Models, One Endpoint

Through Kyma API, you get access to Kyma's active open models from Google, Meta, Alibaba, DeepSeek, Moonshot, MiniMax, and more. All through https://kymaapi.com/v1.

Switch models by changing the model parameter. No new SDK, no new API key, no new billing account.

Get Started

Head to kymaapi.com, sign up for free-tier credit, and try it with your existing OpenAI code. The quickstart guide takes 2 minutes.