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

You can run this example with:

```bash
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:

```sh
npx promptfoo@latest eval
```

Afterwards, you can view the results by running:

```sh
npx promptfoo@latest view
```