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NextChat is a lightweight open-source ChatGPT web UI with one-click Vercel deployment.

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Deployment

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One-click Vercel deploy

On the NextChat repo, click Deploy with Vercel, then set these environment variables in Vercel:
VariableValue
OPENAI_API_KEYsk-XXXXXXXXXXXXXXXX
BASE_URLhttps://openp.ai
CUSTOM_MODELS+gpt-5.5,+gpt-5.4-mini,+claude-opus-4-8,+gemini-3.1-pro-preview,+gemini-3.1-flash-lite
HIDE_USER_API_KEY1 (optional, prevents frontend users from changing the key)
After deployment, visit the domain Vercel provides.

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Docker

docker run -d -p 3000:3000 \
  -e OPENAI_API_KEY=sk-XXXXXXXXXXXXXXXX \
  -e BASE_URL=https://openp.ai \
  -e CUSTOM_MODELS="+gpt-5.5,+claude-opus-4-8,+gemini-3.1-pro-preview" \
  --name nextchat \
  yidadaa/chatgpt-next-web

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Configure in the web UI (no restart needed)

After opening NextChat:
  1. Gear icon at the bottom-left → open settings.
  2. Endpoint / Base URL: https://openp.ai
  3. API Key: sk-XXXXXXXXXXXXXXXX
  4. Custom models: +gpt-5.5,+claude-opus-4-8,+gemini-3.1-pro-preview
  5. Click Check availability → save once it passes.

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Vision chat

NextChat has a built-in image upload button. When you choose a vision model like gpt-5.5 / claude-opus-4-8 / gemini-3.1-pro-preview, you can drag an image directly into the input box, and OpenPAI passes it through as that model’s vision input.

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Notes

  • BASE_URL should not include /v1 — NextChat completes the path automatically.
  • In CUSTOM_MODELS, the + prefix adds a model and - hides one.
  • For a shared multi-user deployment, set an access CODE / password to prevent key leakage.