herdr: Open-Source Terminal Tool Lets Developers Query Multiple AI Models in Parallel

herdr is a lightweight, open-source command-line tool written in Go that sends a single prompt simultaneously to multiple large language models — such as OpenAI GPT-4, Anthropic Claude, and local Ollama models — and displays their responses side by side in the terminal. The project, currently at version 0.1.0, has accumulated over 3,000 GitHub stars and is positioned as a native terminal alternative to tools like OpenRouter for multi-model comparison. Benchmarks on an M1 MacBook Pro showed that parallel calls to three models completed in roughly 1.8 seconds, compared to an estimated 7.5 seconds if queried sequentially. However, the tool carries notable limitations in its early state, including a broken environment-variable substitution in config files, no streaming output, and no automatic retry mechanism. Reviewers suggest herdr suits developers who routinely compare outputs across AI models but caution that it functions more as a multi-model CLI wrapper than a true AI agent framework.