opencode-gpt-imagegen

opencode-gpt-imagegen

Bring ChatGPT Images 2.0 (gpt-image-2) to OpenCode. Use it through your ChatGPT subscription (no API costs!) or through the OpenAI API — your call.

Auth path	Status	Billing
ChatGPT subscription (OAuth)	Available now in v0.1.0	No extra cost — comes out of your existing Plus / Pro / Business plan
OpenAI API key	Coming soon in v0.2.0	Pay-per-image against your API credits, with generate + edit support

Highlights

• Subscription-friendly. Generations ride on the same Codex backend channel OpenCode already uses for ChatGPT subscription chat — billed against your ChatGPT plan, not your API credits.
• Reference images. Pass any number of input images alongside the prompt for style guidance, edit targets, or compositing inputs.

Installation

Add this plugin to your OpenCode config. For example, in opencode.json:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": ["opencode-gpt-imagegen"]
}

OpenCode auto-installs the package via Bun on next launch — no separate npm install step is needed. The plugin requires OpenCode to be authenticated with ChatGPT.

Usage

Just ask your agent in natural language and gpt_imagegen will be picked up.

The three examples below are the actual outputs of this repo's e2e test suite — see tests/e2e.test.ts for the exact prompts and assertions.

Example A — generate

Draw a man in a navy samue with a red hachimaki, standing in a garden full of cherry blossoms. 90s anime style. Save it as character.png, portrait 1024x1536.

Example B — auto-versioning

gpt_imagegen never overwrites an existing file: when the out path is already taken, it picks -v2, -v3, … instead.

Now do the same path but make it a woman in a yellow yukata holding a red wagasa, in a moonlit garden with fireflies. Landscape 1536x1024.

The previous character.png is left untouched; the new image lands at character-v2.png.

Example C — feed existing image files as input

Pass any number of image paths via the images argument and the model uses them as references for the next generation — for style guidance, characters to keep, scenes to extend, and so on.

Take character.png and character-v2.png and put both characters together on the engawa of an old Japanese house, smiling at the viewer. 2048x1152, same 90s anime style.

Roadmap

Version	Auth path	Scope	Status
v0.1.0	ChatGPT subscription	gpt_imagegen with optional reference images (generation + reference-guided edits via prompting)	Released
v0.2.0	OpenAI API key	Adds the API-key billing path: both generate (/v1/images/generations) and edit (/v1/images/edits) with reference images	Next
v0.3.0	OpenAI API key	Adds pixel-precise mask inpainting via /v1/images/edits (binary PNG alpha mask)	Planned

How it works

OpenCode already talks to the OpenAI Codex backend to power ChatGPT subscription chat. This plugin reuses that same endpoint, attaching the hosted image_generation tool to a single-turn request, then writes the returned PNG to disk. Auth is read from OpenCode's standard auth.json; no new credential surface is introduced.

Disclaimer

This is an unofficial, third-party plugin, not affiliated with or endorsed by OpenAI or OpenCode.

It uses the same Codex backend endpoint OpenCode itself calls for ChatGPT subscription chat — this plugin just adds the hosted image_generation tool to that conversation. Use must comply with OpenAI's Terms of Use and Usage Policies.