OpenAI gpt-oss-20b (free)

import requests

response = requests.post(
    "https://neurongate.net/v1/chat/completions",
    headers={
        "Authorization": "Bearer ng-your-api-key",
        "Content-Type": "application/json"
    },
    json={
        "model": "openai/gpt-oss-20b:free",
        "messages": [
            {"role": "user", "content": "Hello!"}
        ]
    }
)

print(response.json()["choices"][0]["message"]["content"])