Token Ekonomisi: Maliyet Optimizasyonu

// Maliyet monitoring middleware
async function callOpenAI(model, messages) {
  const start = Date.now();
 
  const response = await openai.chat.completions.create({
    model,
    messages,
  });
 
  const usage = response.usage;
  const cost = calculateCost(model, usage);
 
  // Telemetri kaydet
  await metrics.record({
    timestamp: new Date(),
    model,
    input_tokens: usage.prompt_tokens,
    output_tokens: usage.completion_tokens,
    total_tokens: usage.total_tokens,
    cost_usd: cost,
    latency_ms: Date.now() - start,
  });
 
  return response;
}
 
function calculateCost(model, usage) {
  const prices = {
    "gpt-5": { input: 2.50, output: 10.00 },
    "gpt-5-mini": { input: 0.15, output: 0.60 },
    "gpt-5-nano": { input: 0.05, output: 0.20 },
  };
  const p = prices[model];
  return (usage.prompt_tokens * p.input + usage.completion_tokens * p.output) / 1_000_000;
}