How to Use GPT-5.6 and Claude for Free on Duck.ai

Want to try multiple AI models without signing up for anything? Duck.ai gives you free access to several models through its private AI chat.

You get GPT-5.6 Luna, Claude Haiku 4.5, and GPT-5.4 mini in one place, with no account and no credit card. Usage limits apply, and the lineup can change over time.

Tutorial

1. Open https://duck.ai. This is Duck.ai's private AI chat page.
2. Pick your model. Choose between GPT-5.6 Luna, Claude Haiku 4.5, or GPT-5.4 mini.
3. Accept the terms if prompted. A terms prompt may appear before the chat opens.
4. Start chatting for free. No account or credit card is required.

Wrapping Up

You can now compare three AI models in one chat without creating an account. Keep in mind that usage limits apply and the available models may change over time.