Given a list of messages comprising a conversation, the model will return a response. Official OpenAI Docs

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completions.create()

Creates a model response for the given chat conversation. Official OpenAI Docs
example.ts
await io.openai.chat.completions.create("chat-completion", {
  model: "gpt-3.5-turbo",
  messages: [
    {
      role: "user",
      content: "Create a good programming joke about background jobs",
    },
  ],
});

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completions.backgroundCreate()

Creates a model response for the given chat conversation, but runs the request in the background using io.backgroundFetch()
example.ts
await io.openai.chat.completions.backgroundCreate("chat-completion", {
  model: "gpt-3.5-turbo",
  messages: [
    {
      role: "user",
      content: "Create a good programming joke about background jobs",
    },
  ],
});