OpenAI SDK

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import OpenAI from "openai"
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const openai = new OpenAI({
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  baseURL: "https://openrouter.ai/api/v1",
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  apiKey: "<OPENROUTER_API_KEY>",
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  defaultHeaders: {
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    "HTTP-Referer": "<YOUR_SITE_URL>", // Optional. Site URL for rankings on openrouter.ai.
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    "X-OpenRouter-Title": "<YOUR_SITE_NAME>", // Optional. Site title for rankings on openrouter.ai.
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  },
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})
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async function main() {
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  const completion = await openai.chat.completions.create({
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    model: "openai/gpt-4o",
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    messages: [
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      { role: "user", content: "Say this is a test" }
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    ],
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  })
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  console.log(completion.choices[0].message)
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}
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main();