Explanation

The correct answer is C. max-tokens.

Why max-tokens is the correct parameter:

1. Purpose of max-tokens: The max-tokens parameter controls the maximum number of tokens (words/subword units) that the model can generate in its response. This directly limits the length of the output.

2. Problem addressed: The question describes "excessively long responses" which increase both latency (response time) and token cost. By reducing the max-tokens value, you can cap the response length, preventing the model from generating unnecessarily verbose outputs.

3. Other parameters explained:

   • A. temperature: Controls randomness/creativity in responses (higher = more random, lower = more deterministic)
   • B. top-p: Nucleus sampling parameter that controls diversity by considering only tokens whose cumulative probability exceeds a threshold
   • D. top-k: Limits the model to consider only the top-k most probable tokens for each generation step

4. Practical application: In Amazon Bedrock, when working with foundation models, adjusting max_tokens (or similar parameter name depending on the specific model) is the standard way to control response length and manage costs associated with token usage.

Best Practice Tip**:

When optimizing for cost and latency in production applications, it's recommended to set appropriate max-tokens limits based on your specific use case requirements, while also considering the trade-off between response completeness and resource consumption.