Agentic Knowledge Architect

Retrieval-Augmented Generation (RAG) is an AI architecture pattern that combines a language model with a knowledge retrieval system. Instead of relying solely on the model's training data, RAG retrieves relevant documents from a knowledge base and includes them in the prompt, grounding the AI's responses in specific, verifiable information. RAG reduces hallucinations by giving the model factual context to work with. It's the most popular enterprise AI pattern in 2026 because it allows organizations to use their proprietary data with general-purpose language models without fine-tuning. The economics of RAG involve balancing retrieval costs (vector database queries, embedding generation) against the cost of hallucination and the alternative cost of fine-tuning. For most enterprise use cases, RAG is significantly cheaper than fine-tuning while providing better accuracy on domain-specific questions.

A Large Language Model is a type of artificial intelligence trained on vast amounts of text data to understand and generate human language. LLMs like GPT-4, Claude, Gemini, and Llama power chatbots, code assistants, content generation, and enterprise AI applications. LLMs work by predicting the next token (word or word-piece) in a sequence. They're trained on billions of parameters using transformer architecture. The 'large' in LLM refers to both the training data (often trillions of tokens) and the model size (billions of parameters). The economics of LLMs are unique: unlike traditional software with near-zero marginal cost, LLMs have significant variable costs that scale with usage. Every query costs compute. This creates what Richard Ewing calls the Cost of Predictivity — as you demand higher accuracy, costs scale exponentially.

AI inference is the process of running a trained model to generate predictions or outputs from new input data. Unlike training (which is done once), inference happens every time a user interacts with an AI feature — every chatbot response, every code suggestion, every image generation. Inference cost is the dominant variable cost in AI features. Training GPT-4 cost an estimated $100M, but inference costs across all users dwarf that number. Each inference call consumes GPU compute proportional to model size and input/output length. Inference optimization is a critical engineering discipline: model quantization (reducing precision from 32-bit to 8-bit or 4-bit), batching (processing multiple requests simultaneously), caching (storing common responses), and distillation (creating smaller student models from larger teacher models). For product leaders, inference cost is the unit cost that determines whether your AI feature has positive or negative unit economics. Richard Ewing's AUEB tool calculates Cost of Predictivity — the true per-query cost including inference, retrieval, verification, and error handling.

Technical debt is the implied cost of future rework caused by choosing an expedient solution now instead of a better approach that would take longer. First coined by Ward Cunningham in 1992, technical debt has become one of the most important concepts in software engineering economics. Like financial debt, technical debt accrues interest. Every shortcut, every "we'll fix it later," every copy-pasted function adds to the principal. The interest comes in the form of slower development velocity, more bugs, longer onboarding times for new engineers, and increased fragility of the system. Technical debt exists on a spectrum from deliberate ("we know this is a shortcut but ship it anyway") to accidental ("we didn't realize this was a bad pattern until later"). Both types compound over time. Organizations that don't actively measure and manage their technical debt risk reaching what Richard Ewing calls the Technical Insolvency Date — the specific quarter when maintenance costs consume 100% of engineering capacity.