Explore a Python class that unifies OpenAI, Anthropic, and Openrouter APIs for seamless implementation of Large Language Models (LLMs) in this comprehensive tutorial video. Learn how to leverage default models like GPT-4, Claude 3.5 Sonnet, and Gemini 1.5 Pro, with the flexibility to customize model selection. Discover the benefits of this unified approach through practical demonstrations and in-depth code review. Gain insights into building LLM-Agent applications efficiently, and understand the requirements for API keys. Follow along as the instructor showcases examples, explains the code structure, and highlights the advantages of using this unified API approach for various AI-driven projects.