If you've ever built an application that integrates with multiple LLM providers (Anthropic, Google, OpenAI, DeepSeek), you already know the pain: Each provider has its own distinct Python SDK. Streaming responses using Server-Sent Events (SSE) requires divergent parser logic. Thinking / Reasoning blocks are formatted completely differently. I recently extracted the core streaming router from my platform into an open-source FastAPI template. Here is how it works. Obje...