ChatPlayground AI Unlimited is offering lifetime access for $54.97, down from an MSRP of $619, through Aug. 16. The platform allows users to enter one prompt and receive responses from multiple AI models side by side, including options from ChatGPT, Gemini, DeepSeek, Llama, and Perplexity, among 20+ models. It supports uploading PDFs and images for context-aware conversations, generating AI images, saving chat history, and using built-in prompt tools. The Unlimited Plan includes unlimited monthly messages subject to a fair-use policy, priority access to new features, and future supported models. The model lineup can change as AI platforms evolve. The service is designed for developers, researchers, marketers, and creators who want to compare outputs from different models in one workspace rather than paying for separate subscriptions. The deal is available through StackSocial, with prices subject to change.