Changes to Create a chat completion (OpenAI-compatible)

the response_format request property type changed from object to no type

removed the request property guided_choice

removed the request property guided_json

removed the request property guided_regex

removed the request property response_format/type

added the new optional request property mode

added the new optional request property reasoning_effort

added the new optional request property region

added the new optional request property service_tier

the request property max_tokens became nullable

removed discriminator from tools/items request property

added ResponseFormatText ResponseFormatJsonObject ResponseFormatJsonSchemaParam to the response_format request property oneOf list

endpoint added