LangChain vs. LlamaIndex vs. Raw API Calls — When to Use What

Posted on Wed 19 August 2026 in GenAI • Tagged with GenAI, LLM, LangChain, LlamaIndex, API, Python, Architecture

Three ways to build with LLMs. Each makes different tradeoffs, and picking the wrong one early costs you time when the project grows. This isn't a ranking — it's a map of when each tool actually fits.

Raw API calls

Direct calls to OpenAI, Anthropic, Gemini, or any provider. No framework …


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