Follow these steps to get your OpenAI API key and start using GPT-5.6 Luna in Chess Coach for intelligent chess coaching.
Visit platform.openai.com and click "Sign up". You can use email, Google, Microsoft, or Apple.
Check your inbox and click the verification link sent by OpenAI.
OpenAI requires SMS verification. Enter your phone number and the code you receive via text message.
Go to Settings → Billing → Add payment method. You need to add credits (minimum ~$5) to use the API.
In the left sidebar, click "API Keys" or go directly to platform.openai.com/api-keys.
Click "Create new secret key". Give it a descriptive name like "Chess Coach".
Your API key (starts with sk-...) is displayed. Copy it right away.
Open Chess Coach → Settings → AI section → Select "OpenAI GPT-5.6 Luna" → Configure → Paste your API key.
| Model | Input (1M tokens) | Output (1M tokens) |
|---|---|---|
| GPT-5.6 Luna Recommended | $0.20 | $1.20 |
| GPT-5.6 Terra | $2.00 | $12.00 |