OpenAI Compatibility Endpoints

Supported endpoints

Endpoint	Method	Docs
/v1/models	GET	Models
/v1/responses	POST	Responses
/v1/chat/completions	POST	Chat Completions
/v1/embeddings	POST	Embeddings
/v1/completions	POST	Completions

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Set the base url to point to LM Studio

You can reuse existing OpenAI clients (in Python, JS, C#, etc) by switching up the "base URL" property to point to your LM Studio instead of OpenAI's servers.

Note: The following examples assume the server port is 1234

Python Example

from openai import OpenAI

client = OpenAI(
+    base_url="http://localhost:1234/v1"
)

# ... the rest of your code ...

Typescript Example

import OpenAI from 'openai';

const client = new OpenAI({
+  baseUrl: "http://localhost:1234/v1"
});

// ... the rest of your code ...

cURL Example

- curl https://api.openai.com/v1/chat/completions \
+ curl http://localhost:1234/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
-     "model": "gpt-4o-mini",
+     "model": "use the model identifier from LM Studio here",
     "messages": [{"role": "user", "content": "Say this is a test!"}],
     "temperature": 0.7
   }'

Using Codex with LM Studio

Codex is supported because LM Studio implements the OpenAI-compatible POST /v1/responses endpoint.

See: Use Codex with LM Studio and Responses.

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Other OpenAI client libraries should have similar options to set the base URL.

If you're running into trouble, hop onto our Discord and enter the #🔨-developers channel.