LangChain

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const chat = new ChatOpenAI(
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  {
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    modelName: '<model_name>',
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    temperature: 0.8,
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    streaming: true,
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    openAIApiKey: '${API_KEY_REF}',
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  },
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  {
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    basePath: 'https://openrouter.ai/api/v1',
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    baseOptions: {
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      headers: {
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        'HTTP-Referer': '<YOUR_SITE_URL>', // Optional. Site URL for rankings on openrouter.ai.
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        'X-Title': '<YOUR_SITE_NAME>', // Optional. Site title for rankings on openrouter.ai.
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      },
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    },
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  },
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);