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133 lines
4.6 KiB
Markdown
133 lines
4.6 KiB
Markdown
# openai-images (OpenAI Image Generation Example)
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You can run this example with:
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```bash
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npx promptfoo@latest init --example openai-images
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cd openai-images
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```
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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.
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## Quick Start
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```bash
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# Create this example
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npx promptfoo@latest init --example openai-images
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# Set your API key
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export OPENAI_API_KEY=your-key-here
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# Run the evaluation
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promptfoo eval
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# View the results
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promptfoo view
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```
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## What's in this Example
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- Compares GPT Image 2, GPT Image 1.5, GPT Image 1, and GPT Image 1 Mini outputs
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- Uses text-to-image generation through the Image API generations endpoint
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- Tests artistic style prompts across different models
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- Configures different image sizes and quality settings
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- Tests with different subjects
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## Supported Models
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### GPT Image 2 (Recommended)
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OpenAI's latest image generation model with flexible custom sizes and improved output controls.
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```yaml
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providers:
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- id: openai:image:gpt-image-2
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config:
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size: 1024x1024 # common sizes, custom WIDTHxHEIGHT, auto
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quality: low # low, medium, high, auto
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background: opaque # opaque, auto
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output_format: webp # png, jpeg, webp
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output_compression: 80 # 0-100, only set with jpeg/webp
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moderation: auto # auto, low
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n: 1 # 1-10 images
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user: promptfoo-user # optional end-user identifier
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```
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### GPT Image 1.5
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High-quality GPT Image model with strong instruction following, prompt adherence, and photorealistic quality. Uses token-based pricing.
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```yaml
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providers:
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- id: openai:image:gpt-image-1.5
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config:
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size: 1024x1024 # 1024x1024, 1024x1536, 1536x1024, auto
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quality: low # low, medium, high, auto
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background: transparent # transparent, opaque, auto
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output_format: webp # png, jpeg, webp
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output_compression: 80 # 0-100, only set with jpeg/webp
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moderation: auto # auto, low
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```
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### GPT Image 1
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High-quality image generation model with superior instruction following and text rendering.
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```yaml
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providers:
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- id: openai:image:gpt-image-1
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config:
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size: 1024x1024 # 1024x1024, 1024x1536, 1536x1024, auto
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quality: low # low, medium, high, auto
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background: transparent # transparent, opaque, auto
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output_format: webp # png, jpeg, webp
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output_compression: 80 # 0-100, only set with jpeg/webp
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moderation: auto # auto, low
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```
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### GPT Image 1 Mini
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Cost-efficient version of GPT Image 1 with the same capabilities at lower cost.
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```yaml
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providers:
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- id: openai:image:gpt-image-1-mini
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config:
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size: 1024x1024 # 1024x1024, 1024x1536, 1536x1024, auto
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quality: low # low, medium, high, auto
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background: transparent # transparent, opaque, auto
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output_format: webp # png, jpeg, webp
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output_compression: 80 # 0-100, only set with jpeg/webp
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moderation: auto # auto, low
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```
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### DALL-E 3 and DALL-E 2
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`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.
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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.
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## Pricing
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| Model | Quality | Size | Price per image |
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| ---------------- | ------- | --------- | --------------- |
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| GPT Image 2 | Low | 1024x1024 | $0.006 |
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| GPT Image 2 | Medium | 1024x1024 | $0.053 |
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| GPT Image 2 | High | 1024x1024 | $0.211 |
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| GPT Image 1.5 | Low | 1024x1024 | ~$0.064 |
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| GPT Image 1.5 | Medium | 1024x1024 | ~$0.128 |
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| GPT Image 1.5 | High | 1024x1024 | ~$0.192 |
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| GPT Image 1 | Low | 1024x1024 | $0.011 |
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| GPT Image 1 | Medium | 1024x1024 | $0.042 |
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| GPT Image 1 | High | 1024x1024 | $0.167 |
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| GPT Image 1 Mini | Low | 1024x1024 | $0.005 |
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| GPT Image 1 Mini | Medium | 1024x1024 | $0.011 |
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| GPT Image 1 Mini | High | 1024x1024 | $0.036 |
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**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.
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## Documentation
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- [OpenAI Image Generation API Documentation](https://developers.openai.com/api/docs/guides/image-generation)
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- [promptfoo OpenAI Provider Documentation](https://promptfoo.dev/docs/providers/openai)
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