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Prompting Across Frontier Models

Once you work in more than one coding tool — Claude Code, OpenAI's Codex CLI, Google's Gemini CLI — you discover that a prompt tuned for one model is rarely a perfect fit for the next. This module is about the portable skill underneath: what actually differs across providers, the prompt patterns that travel everywhere, how each tool's instruction file and structured-output flags work, and how to combine cheap and strong models into a single reliable workflow. It's conceptual on purpose — the goal is judgment you keep even as models, names, and prices change.