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export async function onRequest({ request, env }: any) {
  const allowedModels = [
    '@tx/deepseek-ai/deepseek-r1-0528',
    '@tx/deepseek-ai/deepseek-v3-0324',
  ];

  // Use the model parameter, fallback to default if not provided
  const selectedModel =
    model || '@tx/deepseek-ai/deepseek-v3-0324';

  const aiStream = await AI.chatCompletions({
    model: selectedModel,
    messages: processedMessages,
    stream: true,
  });

  return new Response(aiStream, {
    headers: {
      results: formatResultsForHeader(searchResults)
    },
  });
}