gpt-image-2-skill

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gpt-image-2-skill

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GPT Image 2 (ChatGPT Images 2.0) skill for Claude Code — best-in-class typography, two endpoints (T2I + edit), Fal AI integration, structured-JSON prompting patterns

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# GPT Image 2 Skill

> Generate or edit images with OpenAI's GPT Image 2 — best-in-class for fine typography — via Fal AI.

A Claude Code skill that wires GPT Image 2 (ChatGPT Images 2.0) into your agent in one drop-in file. Two endpoints: text-to-image AND image edit (with optional masks). Sync API, no polling, single POST.

## Why this model

GPT Image 2 is currently the best public model for **legible text inside images**. Use it when the picture *is* the typography:

- Chalkboards, store signs, hand-lettered posters
- Menu boards, packaging mockups, magazine covers
- UI screenshot / app store mockups
- Social cards, banners, multilingual designs

For photoreal portraits or strict style preservation, use a different model (Nano Banana, Flux). For everything text-heavy, this wins.

## Quick Start

### 1. Install the skill

Copy the `SKILL.md` file to your Claude Code project's `.claude/skills/gpt-image-2/` directory.

### 2. Add your Fal AI key

```bash
echo "FAL_KEY=your-fal-ai-key" >> .env
```

Get a key at [fal.ai/dashboard/keys](https://fal.ai/dashboard/keys).

### 3. Generate

Tell Claude Code:

```
Generate a vintage diner chalkboard reading "TODAY SPECIAL — Lobster Roll $24"
```

Or for an edit:

```
Edit https://example.com/photo.png — same scene but everyone is on their phones now
```

## Two endpoints

| Endpoint | When | Required input |
|----------|------|----------------|
| `openai/gpt-image-2` | Generate from a prompt | `prompt` |
| `openai/gpt-image-2/edit` | Modify an existing image | `prompt` + `image_urls` (+ optional `mask_url`) |

The skill ships with one combined helper in Node, Python, and bash — pass `image_urls` to use the edit endpoint, omit for text-to-image.

## What You Get

- **Sync API** — single POST returns the image URL. No polling, no taskId.
- **Up to 4 images per call** for picking from variants.
- **Custom dimensions** up to 3840×2160 (aspect ratio ≤ 3:1, multiples of 16).
- **Image edit** with optional masks for surgical region edits.
- **Combined helper** in Node, Python, and bash — same shape across languages.

## Defaults

| Param | Default | Why |
|-------|---------|-----|
| `quality` | `medium` | Best cost/quality sweet spot (~$0.05/image). High is ~3.5x more — reserve for finals where typography really matters. |
| `image_size` | `landscape_4_3` (T2I) / `auto` (Edit) | Sensible defaults, override per call. |
| `num_images` | `1` | Bump to 4 for variants. |
| `output_format` | `png` | |

## Prompting patterns

The community has converged on two patterns the skill documents:

1. **Structured JSON prompts** for multi-element scenes (posters, infographics, comics, app mockups). Pass the prompt as a JSON object with explicit slots (`type`, `subject`, `style`, `background`, `header`, `layout`). Notably better than prose for complex layouts.
2. **Raycast-style placeholders** — `{argument name="quote" default="Stay hungry, stay foolish"}` — for parameterizable prompt templates.

The skill also points at the **[awesome-gpt-image-2](https://github.com/YouMind-OpenLab/awesome-gpt-image-2)** community library (700+ curated prompts, CC BY 4.0) — when a user asks "how would I prompt this?" Claude can fetch the README, grep the relevant category, and adapt an example.

## Key Rules

1. **Default `quality: medium`** — `high` is ~3.5x the cost. Use medium for iteration, high for finals only.
2. **Auth header is `Key`, not `Bearer`** — Fal-specific. The skill notes this, but if you're hand-rolling: don't burn an hour like I did.
3. **Reference images need public URLs** — Fal storage, prior Fal output URL, or any external host. The skill explains how.
4. **No real transparent backgrounds** — Fal's wrapper doesn't expose OpenAI's `background: "transparent"` param. Asking the prompt for "transparent bg" gets you a *fake* checkerboard baked into RGB pixels. Chain `fal-ai/imageutils/rembg` on the output if you need real alpha.
5. **Edit endpoint preserves more when you describe the *change*, not the whole scene.** "Same workers, but on phones now" beats re-describing everything.

## Pricing

Token-based, billed via Fal:

| Quality | Rough cost (1536×1024) |
|---------|------------------------|
| `low` | ~$0.02 / image |
| `medium` | **~$0.05 / image** ← default |
| `high` | ~$0.18 / image |

Quality is the biggest cost lever. Check actual usage in [fal.ai/dashboard](https://fal.ai/dashboard).

## Credits

- Community prompt library: **[YouMind OpenLab — awesome-gpt-image-2](https://github.com/YouMind-OpenLab/awesome-gpt-image-2)** (CC BY 4.0). When you reuse a prompt verbatim, credit the original author named in each prompt's Details section.
- Hosted via [Fal AI](https://fal.ai).
- Model by [OpenAI](https://openai.com).

## Built By

[RoboNuggets](https://robonuggets.com) — AI agent tools and community.

## License

MIT

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