promptfoo/examples/claude-thinking

claude-thinking (Claude Thinking)

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description: "Demonstrates Claude's thinking capability for complex problem solving"

Claude's Step-by-Step Thinking Demonstration

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 both the Anthropic API directly and Claude on AWS Bedrock.

You can run this example with:

npx promptfoo@latest init --example claude-thinking

What This Example Demonstrates

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

Environment Variables

This example requires at least one of the following sets of credentials:

For Anthropic API (Recommended)

• ANTHROPIC_API_KEY - Your Anthropic API key from console.anthropic.com

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

Prerequisites

For AWS Bedrock, you must:

1. Enable Claude model access in your AWS account
   • Go to the AWS Bedrock console
   • Navigate to "Model access" in the left sidebar
   • Find "Anthropic - Claude" and click "Edit"
   • Enable the model and save changes
2. Ensure you have permissions to use the Claude model
3. Set the correct AWS region in the config (default: us-west-2)

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

• Claude Thinking Documentation
• AWS Bedrock Claude Guide
• AWS Bedrock Model Access Setup
• Promptfoo Documentation on Claude Providers