Full Changelog: [v1.37.2...v1.38.0](https://github.com/openai/openai-python/compare/v1.37.2...v1.38.0)
Features
* extract out `ImageModel`, `AudioModel`, `SpeechModel` ([1586](https://github.com/openai/openai-python/issues/1586)) ([b800316](https://github.com/openai/openai-python/commit/b800316aee6c8b2aeb609ca4c41972adccd2fa7a))
* make enums not nominal ([1588](https://github.com/openai/openai-python/issues/1588)) ([ab4519b](https://github.com/openai/openai-python/commit/ab4519bc45f5512c8c5165641c217385d999809c))