Function getSystemMessageMode

packages/ai/openai/src/OpenAiLanguageModel.ts:389–395

(model: string)

// =============================================================================

const getSystemMessageMode = (model: string): "system" | "developer" =>
  model.startsWith("o") ||
    model.startsWith("gpt-5") ||
    model.startsWith("codex-") ||
    model.startsWith("computer-use")
    ? "developer"
    : "system"

const prepareMessages: (
  options: LanguageModel.ProviderOptions,