The Fundamentals Every Developer Must Know First
Before you master Copilot, Codex, or Claude Code — understand what you're actually talking to. Tokens, context windows, the two-layer model, three modes of assistance.
The complete field guide to AI-assisted development in 2026, updated 27 September 2026 with current models (Claude Opus 5.5 and Fable 5.1, GPT-6 Sol and Luna), Copilot’s new AI Credits billing and each tool’s latest features. Four articles covering the foundations, then deep dives into each major tool — GitHub Copilot, OpenAI Codex, and Claude Code. Built for developers and DevOps engineers who want to move past tab-complete.
Before you master Copilot, Codex, or Claude Code — understand what you're actually talking to. Tokens, context windows, the two-layer model, three modes of assistance.
Every Copilot feature explained — inline suggestions, NES, chat modes, agent mode, 20+ models, MCP servers, custom agents, Spaces, Spark, and real DevOps workflows.
Submit a task, walk away, come back to verified code. Cloud-native async agent: isolated sandboxes, AGENTS.md, parallel tasks, citations, and the Codex CLI.
Terminal-native, conversational, infinitely extensible. Hooks, subagents, agent teams, MCP servers, permission modes, and the Explore→Plan→Code workflow.