OpenAI Harmony

OpenAI Harmony is a Python library providing a renderer for OpenAI's 'Harmony' response format, specifically designed for its open-weight model series, gpt-oss. It enables structured conversations, reasoning output, and function calls, mimicking the OpenAI Responses API. The library, with a Rust core and Python bindings, ensures consistent formatting, efficient processing, and first-class Python support, including typed stubs. It is crucial for developers building inference solutions for gpt-oss models, as these models are trained on and require the Harmony format for correct operation.