Delta – Test GPT prompts directly in VS Code

Hi everyone,

I recently launched Delta, a VS Code extension that makes testing GPT prompts feel as natural as writing code.

Working with LLMs often involves: • Constantly switching between browser tabs and your IDE • Losing prompt history or context • Manually tweaking temperature or function call settings

Delta solves this by bringing everything directly into VS Code. You can test prompts instantly, adjust settings, and work with function calls—all without leaving your coding environment.

Key Features: • Instant testing: Use Ctrl+Alt+P to start testing prompts right away • Dual testing modes: Switch between chat completions and function testing • Developer-first design: Matches your VS Code theme and has a split-view interface

It’s free, open-source, and I’d love your feedback! • Does this solve a problem you’ve faced? • What features would make it even better? • How do you currently approach prompt development and testing?

Here’s the repo: https://github.com/GeLi2001/Delta Try it out and let me know what you think!