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⚠️ Grey area, by design. "Sign in with ChatGPT" is officially meant for Codex. GPTImage reuses that token to reach GPT Image 2 (ChatGPT Images 2.0). It works and is widely done, but it is not an officially sanctioned API. Keep usage personal/local. Heavy use can trigger plan rate-limits (429) or, worst case, account restrictions. You accept that risk by using this.

What you get

• A local MCP server Claude Code talks to (generate_image, image_auth_status).
• A Claude Code skill (/gptimage) that teaches the agent when and how to use it.
• A CLI for login and one-shot generation.
• No API key. No password ever handled by the tool — you log in yourself in the browser.

Requirements

• Node.js ≥ 20 (tested on v22)
• A ChatGPT account with an active plan (Plus / Pro / etc.)

Install — one flow

git clone https://github.com/Connected-Mate/gptimage.git
cd gptimage
npm install
./install.sh

./install.sh registers the tool globally with Claude Code, then opens your browser to sign in with ChatGPT. When you see the success screen, you're done.

Because the tool is registered at the user level, it works in every Claude Code project on your machine — you only set it up once. (Restart Claude Code if it was already open, so it picks up the new tool.)

Check it any time:

npm run status     # show plan, account, token expiry
npm run logout     # remove stored credentials
npm run login      # sign in again

Use it in Claude Code

Open Claude Code in any project and just ask:

Generate a watercolor red fox in snow and save it to fox.png using the gptimage tool.

Claude Code calls generate_image and saves the PNG.

Or from the terminal

npm run gen -- --prompt "a red fox in snow, watercolor" --out fox.png --size 1024x1024
npm run gen -- -p "apply Image 1's style to Image 2" -o out.png --ref style.png --ref subject.png

How it works

your prompt
   │
   ▼
generate_image (MCP tool)
   │   reads your ChatGPT token from ~/.gptimage/auth.json  (or ~/.codex/auth.json)
   │   refreshes via auth.openai.com/oauth/token if expired
   ▼
POST https://chatgpt.com/backend-api/codex/responses
   model: gpt-5.5, tools:[{ type: image_generation }]  ← GPT Image 2
   headers: Authorization: Bearer <subscription token>, chatgpt-account-id
   ▼
SSE stream → "image_generation_call" → base64 PNG
   ▼
saved to disk (auto-versioned, never overwrites)

File	Role
src/auth.js	OAuth token storage, refresh, account-id extraction, Codex fallback
src/login.js	Interactive PKCE login + --status / --logout
src/codex.js	The responses request + SSE image parsing
src/images.js	Reference-image encoding + safe PNG saving
src/server.js	MCP server (stdio)
src/gen.js	One-shot CLI

Configuration (env vars)

Var	Purpose
GPTIMAGE_MODEL	Override the subscription model slug (default gpt-5.5) if OpenAI rotates it
GPTIMAGE_ORIGINATOR	Client identifier sent to the backend (default codex_cli_rs)
GPTIMAGE_PROJECT_DIR	Base dir for relative paths (MCP server)
GPTIMAGE_ACCESS_TOKEN	Provide a token directly (CI / escape hatch)

Roadmap

• edit_image — first-class image editing endpoint
• inpaint_with_mask — pixel-precise zone editing via PNG alpha masks
• Multiple-output / variations in one call
• Optional OpenAI API-key backend as a fallback when the plan is rate-limited

Credits / prior art

• yuji-hatakeyama/opencode-gpt-imagegen — the OpenCode plugin this mirrors
• numman-ali/opencode-openai-codex-auth — OAuth/PKCE flow reference
• EvanZhouDev/openai-oauth — Codex OAuth proxy reference

Not affiliated with OpenAI. Use at your own risk, in accordance with OpenAI's terms.