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..

compare-claude-vs-gpt-image (Image Analysis Example)

You can run this example with:

npx promptfoo@latest init --example compare-claude-vs-gpt-image
cd compare-claude-vs-gpt-image

Usage

This example compares an image analysis task using:

  • gpt-4.1 via OpenAI
  • claude-sonnet-4-6 via Amazon Bedrock
  • claude-sonnet-4-6 via Anthropic
  • gemini-3.1-flash-image-preview (Nano Banana 2) via Google AI Studio

GPT-4.1, Claude, and Gemini have different prompt formats. We use custom provider functions in Python and JavaScript to dynamically format the prompt based on context about the provider. The responses are scored using llm-rubric with a vision-capable OpenAI model.

To get started, set your environment variables:

  • OPENAI_API_KEY
  • ANTHROPIC_API_KEY
  • GEMINI_API_KEY
  • AWS_ACCESS_KEY_ID
  • AWS_SECRET_ACCESS_KEY

If you do not have access to all of these providers, simply comment out the providers you do not have access to in promptfooconfig.yaml.

Then run:

npx promptfoo@latest eval

Afterwards, you can view the results by running:

npx promptfoo@latest view