Universal Free AI API for Developers

1. Open Cursor Settings (Ctrl + Shift + J or Cmd + Shift + J)
2. Go to "Models" tab
3. Enable "OpenAI API Key"
4. Check "Override OpenAI Base URL" and enter:
   https://zerocostai.pro/v1
5. Enter any API Key:
   zerocostai-free
6. Add custom model names:
   claude-3-7-sonnet
   deepseek-r1
   openai-gpt-4o
   meta-llama-3-3-70b

API Provider: OpenAI Compatible
Base URL: https://zerocostai.pro/v1
API Key: zerocostai-free
Model ID: claude-3-7-sonnet  (or deepseek-r1 / openai-gpt-4o)

from openai import OpenAI

# Initialize ZeroCostAI Free Endpoint
client = OpenAI(
    base_url="https://zerocostai.pro/v1",
    api_key="zerocostai-free"
)

response = client.chat.completions.create(
    model="claude-3-7-sonnet", # or "deepseek-r1", "openai-gpt-4o"
    messages=[
        {"role": "system", "content": "You are an expert full-stack engineer."},
        {"role": "user", "content": "Write an efficient LRU Cache in Python with unit tests."}
    ]
)

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

curl https://zerocostai.pro/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer zerocostai-free" \
  -d '{
    "model": "deepseek-r1",
    "messages": [
      {"role": "user", "content": "Explain quantum entanglement in 2 concise paragraphs."}
    ]
  }'

Model Provider: OpenAI
Endpoint URL: https://zerocostai.pro/v1
API Key: zerocostai-free
Custom Models: claude-3-7-sonnet,deepseek-r1,openai-gpt-4o,meta-llama-3-3-70b