How to Use OpenRouter Presets: Config-as-Code Guide

You’ve put the same model name, system prompt, and temperature in a web app, a batch script, and a notebook. Now you want to change the temperature or model, so you have to edit all three. We built presets to solve exactly this. A preset is config-as-code for your LLM calls, a named, versioned set of models, system prompts, provider routing, and sampling parameters. We let you define it once and use its name everywhere. When you change the preset, every app that uses it picks up the change. This guide adds to the presets docs reference and the launch announcement. You’ll create a preset, use it in an API call, and work through two setups: an image-prompt-enhancement preset and a fixed Fusion configuration. A preset stores a model or fallback array, a system prompt, provider routing, and sampling parameters under one name. Use it in any request as "model": "@preset/your-preset-name". Update it in the dashboard, and every app that…