Release Notes:

- Removed deprecated OpenAI models
- Added support for gpt-5.4-nano/mini models for OpenAI provider
- Improved output quality when using OpenAI models

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Co-authored-by: Bennet Bo Fenner <bennetbo@gmx.de>
Co-authored-by: Smit Barmase <heysmitbarmase@gmail.com>
Co-authored-by: Gaauwe Rombouts <mail@grombouts.nl>