How to use Pydantic with OpenRouter

import os
import json
import requests
import time
from inputs import get_input_text
from system import system_instruction_1 as system_instruction
from schema import VAERSReport
from dotenv import load_dotenv

load_dotenv()
model_name = 'openai/gpt-5'
api_key = os.getenv("OPENROUTER_API_KEY")

json_schema_text = json.dumps(VAERSReport.model_json_schema(), indent=2)
input_text, sentence_map = get_input_text()

prompt = f"""

Report: {input_text}

JSON Schema:
{json_schema_text}
"""
url = "https://openrouter.ai/api/v1/chat/completions"

headers = {
    "Authorization": f"Bearer {api_key}",
    "Content-Type": "application/json",
    "HTTP-Referer": "https://botflo.com/",  # Optional. Site URL for rankings on openrouter.ai.
    "X-Title": "LLM Accuracy Comparisons for Structured Outputs",  # Optional
}

payload = {
    "model": model_name,
    "messages": [
        {"role": "system", "content": f'{system_instruction}'},
        {"role": "user", "content": f'{prompt}'}
    ],
    "reasoning": {
        "effort": "high"
    }

}
before = time.time()
response_full = requests.post(url, headers=headers, data=json.dumps(payload))
elapsed = time.time() - before

response = response_full.json()
metadata = {
    "elapsed": elapsed,
    "system_instruction": system_instruction,
    "sentence_map": sentence_map,
    "json_schema_text": json_schema_text
}
response["metadata"] = metadata

response_file_name = f"responses/response_{model_name.replace('/', '-')}.json"
with open(response_file_name, 'w+') as f:
    json.dump(response, f, indent=2)

output_text = response.get('choices')[0].get('message').get('content')
print(output_text)

input_file_name = f"inputs/input_{model_name.replace('/', '-')}.txt"
with open(input_file_name, 'w+') as f:
    f.write(input_text)

output_file_name = f"outputs/output_{model_name.replace('/', '-')}.txt"
with open(output_file_name, 'w+') as f:
    f.write(output_text)