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claude-thinking (Claude Thinking)

This example demonstrates Claude's "thinking" capability, which allows you to see the model's step-by-step reasoning process before it provides a final answer. The example compares thinking outputs from Claude Sonnet 4 (Anthropic API) and Claude Haiku 4.5 (AWS Bedrock).

You can run this example with:

npx promptfoo@latest init --example claude-thinking
cd claude-thinking

What This Example Demonstrates

  • Using Claude's thinking feature to reveal step-by-step reasoning
  • Comparing thinking output quality between different Claude models
  • Comparing Anthropic API vs AWS Bedrock providers
  • Configuring the thinking token budget
  • Using LLM-based evaluation rubrics to assess reasoning quality

Environment Variables

This example requires:

For Anthropic API

For AWS Bedrock

  • AWS_ACCESS_KEY_ID - Your AWS access key
  • AWS_SECRET_ACCESS_KEY - Your AWS secret key
  • Or configure credentials via the AWS CLI: aws configure

Running the Example

After setting up environment variables:

# From the example directory
promptfoo eval
promptfoo view

Test Cases

This example includes several test cases of increasing complexity:

  1. 8 Balls Problem - A classic logic puzzle requiring careful reasoning
  2. Train Meeting Problem - A traditional algebra word problem

These test cases are specifically designed to showcase Claude's ability to break down complex problems and show detailed thinking steps.

How Claude Thinking Works

The thinking feature is enabled by setting special parameters in the provider configuration:

thinking:
  type: 'enabled'
  budget_tokens: 4096 # Controls how many tokens are allocated for thinking
max_tokens: 8192 # Must be greater than budget_tokens

When enabled, Claude's response will include a "Thinking:" section that shows its reasoning process before the final answer:

Thinking: Let me solve this step by step...
1. First, I'll divide the 8 balls into three groups...
2. In the first weighing, I'll compare groups A and B...
3. Based on the result, I can determine...

Final answer: We need exactly 2 weighings to find the heavier ball.

Additional Resources