Arize Phoenix TS
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    ChatCompletionMessageParam:
        | ChatCompletionDeveloperMessageParam
        | ChatCompletionSystemMessageParam
        | ChatCompletionUserMessageParam
        | ChatCompletionAssistantMessageParam
        | ChatCompletionToolMessageParam
        | ChatCompletionFunctionMessageParam

    Developer-provided instructions that the model should follow, regardless of messages sent by the user. With o1 models and newer, developer messages replace the previous system messages.