opencode-gpt-image

Image generation and editing tools for opencode, powered by OpenAI gpt-image-2.

Add one line to your config and any agent can create and edit images.

Install

Add it to the plugin array in your opencode.json (global: ~/.config/opencode/opencode.json):

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

Restart opencode. Done — no key required if you've already run opencode auth login and connected OpenAI (see Auth below).

Auth

The tools are always registered; auth is only resolved when you actually call one, in this order:

1. OPENAI_API_KEY env var — a platform API key, billed per image.
2. opencode's own openai credential, whatever you already connected via opencode auth login (or the /connect command) — no separate setup:
   • a platform API key you entered there, reused directly, or
   • your ChatGPT/Codex subscription (Plus/Pro/Business), if you signed in with "Sign in with ChatGPT". Rides the same session opencode itself uses for chat — refreshed automatically, no extra OAuth flow, no per-image API billing.
3. A key file (~/.config/opencode/openai.key by default) — a fallback for headless/CI setups that don't want to touch opencode's managed auth store.
4. Nothing found → the tool call fails with a message telling you exactly what to do.

If you don't already have opencode auth login set up with OpenAI, either export OPENAI_API_KEY, or run:

opencode auth login
# pick OpenAI, then either "ChatGPT Pro/Plus" (browser or headless) or "Manually enter API Key"

Note

The ChatGPT/Codex subscription path calls the same undocumented chatgpt.com/backend-api/codex/images/* endpoints Codex CLI/opencode use internally. It's not a publicly documented API and can change without notice. mask_path and non-PNG output are only available in platform API key mode. Usage must comply with OpenAI's Terms of Use and Usage Policies.

Tools

Tool	Does
image_generate	Text prompt (+ optional reference image(s)) -> image(s), saved to disk.
image_edit	Edit/transform existing image(s), optional mask, -> image(s).

image_generate also accepts an optional image_paths array of existing reference images to guide/condition the generation.

Both support size, quality, background, output_format, n, and output_path.

Config

Env var	Purpose
OPENAI_API_KEY	Platform API key (overrides opencode's stored credential and the key file).
OPENCODE_OPENAI_KEY_FILE	Custom key-file path. Default ~/.config/opencode/openai.key.
OPENCODE_IMAGE_MODEL	Override the model. Default gpt-image-2 (try gpt-image-1-mini for cheaper output).

License

MIT