diff --git a/README.md b/README.md
index 8291ea0..db508cd 100644
--- a/README.md
+++ b/README.md
@@ -320,6 +320,7 @@ For example, add these lines to your `.bashrc`, `.zshrc`, or equivalent shell pr
 ```sh
 # For OpenAI
 export OPENAI_API_KEY="sk-..."
+export OPENAI_API_BASE="https://provider.example.com/v1" # Optional: Use a custom OpenAI-compatible endpoint
 
 # For Anthropic
 export ANTHROPIC_API_KEY="..."
diff --git a/src/voxd/core/aipp.py b/src/voxd/core/aipp.py
index 6e206ca..0cb8512 100644
--- a/src/voxd/core/aipp.py
+++ b/src/voxd/core/aipp.py
@@ -62,7 +62,8 @@ def run_ollama_aipp(prompt: str, model: str = "llama3.2:latest") -> str:
 
 
 def run_openai_aipp(prompt: str, model: str = "gpt-3.5-turbo") -> str:
-    url = "https://api.openai.com/v1/chat/completions"
+    base_url = os.getenv("OPENAI_API_BASE", "https://api.openai.com/v1")
+    url = f"{base_url}/chat/completions"
     headers = {
         "Authorization": f"Bearer {os.getenv('OPENAI_API_KEY', '')}",
         "Content-Type": "application/json"