base-url = http://127.0.0.1:<port>/engines/v1
spring.ai.openai.chat.options.model = configured-model

call 1, model.call(new Prompt("ping"))
  POST /engines/v1/chat/completions | Authorization: Bearer not-needed | model: configured-model

call 2, same prompt with OpenAiChatOptions.builder().temperature(0.0).build()
  POST /engines/v1/chat/completions | Authorization: Bearer not-needed | model: gpt-5-mini