Duck.ai

Duck.ai is DuckDuckGo’s free, private AI chat. No account, no sign-in, no card. Chat with GPT-6 Luna, GPT-5.4 mini, Claude Haiku 4.5, Mistral Small 4, gpt-oss 120B, and Gemma 4 31B, all in one place, with your prompts anonymized and never used to train the models. It is a great free way to write and refine image generation prompts, then paste them into your image tool. Chats stay on your device, not on a server.