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Implementing model fallbacks

To guarantee 24/7 service, TrailBlaze needs to fall back to a lighter model when Claude is unavailable. Implement a fallback from Claude to Nova Text Lite when encountering issues, to ensure continuous service to the travel app.

The json and boto3 libraries, and the bedrock client, are preloaded.

Bu egzersiz, kursun bir parçasıdır

Introduction to Amazon Bedrock

Kursa Göz Atın

Egzersiz talimatları

  • Wrap the primary Claude model call in a try block.
  • In the except block, handle errors using ClientError and call the Nova Text Lite model.

Uygulamalı etkileşimli egzersiz

Bu egzersizi bu örnek kodu tamamlayarak deneyin.

def process_with_fallback(prompt):
    # Handle errors with a try-except block
    ____:
        response = bedrock.invoke_model(
          modelId="us.anthropic.claude-sonnet-4-5-20250929-v1:0",
          body=json.dumps({"anthropic_version": "bedrock-2023-05-31", "max_tokens": 100,
                           "messages": [{"role": "user", "content": [{"type": "text", "text": prompt}]}]}))
        return json.loads(response["body"].read().decode())["content"][0]["text"]
    except ____:
        fallback = bedrock.invoke_model(
            modelId="us.amazon.nova-2-lite-v1:0",
            body=json.dumps({"messages": [{"role": "user", "content": [{"text": prompt}]}]}))
        return json.loads(fallback["body"].read().decode())["output"]["message"]["content"][0]["text"]

print(process_with_fallback("What are the best destinations in Australia for kayaking?"))
Kodu Düzenle ve Çalıştır