Three ways to teach an LLM to work with your data and tasks - put everything in the context window, connect RAG (retrieval-augmented generation), or fine-tune the model. Each approach has its own cost, speed of knowledge updates, and accuracy ceiling. Below is how they work, how they differ, and how to pick a strategy for a chatbot, support assistant, or internal copilot without overspending.
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Codex is OpenAI's product for writing, editing, and debugging code with language models. The name first appeared in 2021 with the model that powered the original GitHub Copilot; by mid-2026 Codex had grown into a full coding agent in the ChatGPT and GPT-5.6 ecosystem. Alongside it work Cursor, Claude Code, GitHub Copilot, and other AI assistants - all speed up development but embed differently in your workflow. Below is what Codex is today, how programming assistants work, and how to pick a tool for your task.
- Codex - OpenAI's coding agent: repo edits, terminal, tests, integration with ChatGPT Work
- GPT-5.6 Sol - OpenAI's flagship for code; Terra and Luna are cheaper options
- AI assistants - from Tab suggestions to agents that read the project and run commands
- Tool choice - depends on IDE, company policy, budget, and how much automation you want
Ollama is a tool for running large language models (LLMs) locally on your computer or server. It downloads models, manages them, and provides a CLI and HTTP API without a cloud subscription or sending data to third parties. Below - why local models matter, how to install Ollama on Windows, macOS, and Linux, which models to choose, and how to connect them to your apps.
- Privacy - prompts and documents never leave your machine
- Offline - works without internet after the model is downloaded
- Free - no per-token fees, only your hardware and electricity
- API - OpenAI-compatible format for Cursor, n8n, LangChain, and other tools
GEO (Generative Engine Optimization) is the practice of optimizing your site and content so that generative search systems - ChatGPT, Perplexity, Google AI Overviews, Copilot, Gemini - find your materials, cite them, and recommend your brand in user answers. Classic SEO still matters, but AI search works differently: the model does not show a list of links; it synthesizes an answer from several sources. Below is what GEO is, how it differs from SEO, and how to prepare your site for this new reality.
An AI agent is a software system built on a language model that does not just answer questions but acts: it searches CRM data, creates tickets, sends emails, analyzes documents, and makes decisions within defined rules. For business, this is a way to automate routine work without writing a separate backend for every scenario. Below is what agents are, how they differ from chatbots and classic automation, and how to implement them step by step.
RAG (Retrieval-Augmented Generation) is an approach where a language model finds relevant fragments from your knowledge base before answering, then generates text. Instead of "memorizing" all documents in model weights or loading them entirely into context, the system searches for the right pieces and injects them into the prompt. Below - what RAG is, how the pipeline works, and when the method makes sense in production.
By mid-2026, three tools define AI-assisted development: Cursor as an editor with an agent over the whole repo, Claude Code as Anthropic's terminal agent, and GitHub Copilot as the default add-on for VS Code and JetBrains. All offer autocomplete, chat, and multi-file edits, but philosophy, ecosystem, and pricing differ. Below is a scenario-based comparison to pick one tool or a deliberate combo.
MCP (Model Context Protocol) is an open protocol that standardizes how AI assistants connect to external data and tools. Instead of a separate integration for every service (GitHub, a database, CRM, the file system), you run an MCP server and the client - Cursor, Claude Desktop, Zed, and others - connects through a single contract. Below is what MCP is, how the architecture works, and why the protocol matters in production.
Cursor is an AI-powered code editor built on VS Code. It keeps the familiar interface, extensions, and keyboard shortcuts, but adds model chat, Tab autocomplete, agent mode, and project-wide context - not just the open file. Below is what Cursor IDE is, how it differs from a regular editor, and when it makes sense to switch.
The context window is the amount of text a language model "sees" in a single request: your prompt, chat history, uploaded documents, and the model's reply. Whether an entire codebase, a long contract, or only a short chat fits in one API call depends on window size. Below is what a context window is, how it is measured in tokens, and why it is one of the main parameters when choosing a model.