# openai-images (OpenAI Image Generation Example)

You can run this example with:

```bash
npx promptfoo@latest init --example openai-images
cd openai-images
```

A simple example showing how to evaluate OpenAI's current image generation models (GPT Image 2, GPT Image 1.5, GPT Image 1, GPT Image 1 Mini) with promptfoo.

## Quick Start

```bash
# Create this example
npx promptfoo@latest init --example openai-images

# Set your API key
export OPENAI_API_KEY=your-key-here

# Run the evaluation
promptfoo eval

# View the results
promptfoo view
```

## What's in this Example

- Compares GPT Image 2, GPT Image 1.5, GPT Image 1, and GPT Image 1 Mini outputs
- Uses text-to-image generation through the Image API generations endpoint
- Tests artistic style prompts across different models
- Configures different image sizes and quality settings
- Tests with different subjects

## Supported Models

### GPT Image 2 (Recommended)

OpenAI's latest image generation model with flexible custom sizes and improved output controls.

```yaml
providers:
  - id: openai:image:gpt-image-2
    config:
      size: 1024x1024 # common sizes, custom WIDTHxHEIGHT, auto
      quality: low # low, medium, high, auto
      background: opaque # opaque, auto
      output_format: webp # png, jpeg, webp
      output_compression: 80 # 0-100, only set with jpeg/webp
      moderation: auto # auto, low
      n: 1 # 1-10 images
      user: promptfoo-user # optional end-user identifier
```

### GPT Image 1.5

High-quality GPT Image model with strong instruction following, prompt adherence, and photorealistic quality. Uses token-based pricing.

```yaml
providers:
  - id: openai:image:gpt-image-1.5
    config:
      size: 1024x1024 # 1024x1024, 1024x1536, 1536x1024, auto
      quality: low # low, medium, high, auto
      background: transparent # transparent, opaque, auto
      output_format: webp # png, jpeg, webp
      output_compression: 80 # 0-100, only set with jpeg/webp
      moderation: auto # auto, low
```

### GPT Image 1

High-quality image generation model with superior instruction following and text rendering.

```yaml
providers:
  - id: openai:image:gpt-image-1
    config:
      size: 1024x1024 # 1024x1024, 1024x1536, 1536x1024, auto
      quality: low # low, medium, high, auto
      background: transparent # transparent, opaque, auto
      output_format: webp # png, jpeg, webp
      output_compression: 80 # 0-100, only set with jpeg/webp
      moderation: auto # auto, low
```

### GPT Image 1 Mini

Cost-efficient version of GPT Image 1 with the same capabilities at lower cost.

```yaml
providers:
  - id: openai:image:gpt-image-1-mini
    config:
      size: 1024x1024 # 1024x1024, 1024x1536, 1536x1024, auto
      quality: low # low, medium, high, auto
      background: transparent # transparent, opaque, auto
      output_format: webp # png, jpeg, webp
      output_compression: 80 # 0-100, only set with jpeg/webp
      moderation: auto # auto, low
```

### DALL-E 3 and DALL-E 2

`dall-e-3` and `dall-e-2` remain supported by the provider for backward compatibility, but they are deprecated by OpenAI. Use `gpt-image-2`, `gpt-image-1.5`, `gpt-image-1`, or `gpt-image-1-mini` for new evals.

Promptfoo's `openai:image` provider currently supports text-to-image generation. Image edits/reference inputs, variations, and streaming partial images are not part of this example and are rejected if configured.

## Pricing

| Model            | Quality | Size      | Price per image |
| ---------------- | ------- | --------- | --------------- |
| GPT Image 2      | Low     | 1024x1024 | $0.006          |
| GPT Image 2      | Medium  | 1024x1024 | $0.053          |
| GPT Image 2      | High    | 1024x1024 | $0.211          |
| GPT Image 1.5    | Low     | 1024x1024 | ~$0.064         |
| GPT Image 1.5    | Medium  | 1024x1024 | ~$0.128         |
| GPT Image 1.5    | High    | 1024x1024 | ~$0.192         |
| GPT Image 1      | Low     | 1024x1024 | $0.011          |
| GPT Image 1      | Medium  | 1024x1024 | $0.042          |
| GPT Image 1      | High    | 1024x1024 | $0.167          |
| GPT Image 1 Mini | Low     | 1024x1024 | $0.005          |
| GPT Image 1 Mini | Medium  | 1024x1024 | $0.011          |
| GPT Image 1 Mini | High    | 1024x1024 | $0.036          |

**Note:** Prices shown are 1024x1024 output image estimates and do not include input text tokens. For GPT Image 2 `auto` quality or custom sizes, promptfoo preserves OpenAI usage metadata and leaves `cost` unset instead of guessing.

## Documentation

- [OpenAI Image Generation API Documentation](https://developers.openai.com/api/docs/guides/image-generation)
- [promptfoo OpenAI Provider Documentation](https://promptfoo.dev/docs/providers/openai)