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templates/chat-completion-nodejs.ts

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+// Complete Chat Completion Example (Node.js SDK)
+// Shows multi-turn conversation, GPT-5 parameters, and error handling
+
+import OpenAI from 'openai';
+
+const openai = new OpenAI({
+  apiKey: process.env.OPENAI_API_KEY,
+});
+
+async function chatWithGPT5() {
+  try {
+    // Multi-turn conversation
+    const messages: OpenAI.Chat.ChatCompletionMessageParam[] = [
+      {
+        role: 'system',
+        content: 'You are a helpful assistant that explains complex topics simply.'
+      },
+      {
+        role: 'user',
+        content: 'Explain quantum computing to a 10-year-old'
+      }
+    ];
+
+    // First turn with GPT-5 specific parameters
+    const completion1 = await openai.chat.completions.create({
+      model: 'gpt-5',
+      messages: messages,
+      reasoning_effort: 'medium', // GPT-5 parameter
+      verbosity: 'high',          // GPT-5 parameter
+      max_tokens: 500,
+    });
+
+    const assistantMessage = completion1.choices[0].message;
+    console.log('Assistant:', assistantMessage.content);
+
+    // Add assistant response to conversation
+    messages.push(assistantMessage);
+
+    // Follow-up question
+    messages.push({
+      role: 'user',
+      content: 'Can you give me an example?'
+    });
+
+    // Second turn
+    const completion2 = await openai.chat.completions.create({
+      model: 'gpt-5',
+      messages: messages,
+      reasoning_effort: 'medium',
+      verbosity: 'medium',
+      max_tokens: 300,
+    });
+
+    console.log('Assistant:', completion2.choices[0].message.content);
+
+    // Token usage
+    console.log('\nToken usage:');
+    console.log('- Prompt tokens:', completion2.usage?.prompt_tokens);
+    console.log('- Completion tokens:', completion2.usage?.completion_tokens);
+    console.log('- Total tokens:', completion2.usage?.total_tokens);
+
+  } catch (error: any) {
+    if (error.status === 401) {
+      console.error('Invalid API key. Check OPENAI_API_KEY environment variable.');
+    } else if (error.status === 429) {
+      console.error('Rate limit exceeded. Please wait and try again.');
+    } else {
+      console.error('Error:', error.message);
+    }
+  }
+}
+
+chatWithGPT5();