Adding Open Router inference Example (#226)

Co-authored-by: Jason Liu <jason@jxnl.co>

examples/open_source_examples/openrouter.py

@@ -0,0 +1,59 @@
+import os
+import instructor
+from openai import OpenAI
+from pydantic import BaseModel, Field
+from typing import Optional
+from instructor import Maybe, Mode
+
+# Extract API key from environment
+openrouter_api_key = os.environ.get("OPENROUTER_API_KEY")
+assert openrouter_api_key, "OPENROUTER_API_KEY is not set in environment variables"
+
+# Base URL for OpenAI
+openrouter_base_url = os.environ.get("OPENROUTER_BASE_URL")
+assert openrouter_base_url, "OPENROUTER_BASE_URL is not set in environment variables"
+
+# Initialize OpenAI client
+client = instructor.patch(
+    OpenAI(api_key=openrouter_api_key, base_url=openrouter_base_url),
+    mode=Mode.JSON,
+)
+
+data = [
+    "Brandon is 33 years old. He works as a solution architect.",
+    "Jason is 25 years old. He is the GOAT.",
+    "Dominic is 45 years old. He is retired.",
+    "Jenny is 72. She is a wife and a CEO.",
+    "Holly is 22. She is an explorer.",
+    "There onces was a prince, named Benny. He ruled for 10 years, which just ended. He started at 22.",
+    "Simon says, why are you 22 years old marvin?",
+]
+
+
+if __name__ == "__main__":
+    class UserDetail(BaseModel):
+        name: str = Field(description="Name extracted from the text")
+        age: int = Field(description="Age extracted from the text")
+        occupation: Optional[str] = Field(
+            default=None, description="Occupation extracted from the text"
+        )
+
+    for content in data:
+        MaybeUser = Maybe(UserDetail)
+        user = client.chat.completions.create(
+            response_model=MaybeUser, model="teknium/openhermes-2.5-mistral-7b", messages=[
+            {
+                "role": "system",
+                "content": f"You are an expert at outputting json. You always output valid json based on this schema: {MaybeUser.model_json_schema()}",
+            },
+            {
+                "role": "user",
+                "content": f"Extract the user details from the following text: {content}. Match your response the correct schema",
+            },
+        ]
+        )
+        # Output the error or the result.
+        if user.error:
+            print(f"Error: {user.error}")
+        if user.result:
+            print(f"Result: {user.result}")