Get an AiFuse second opinion directly inside Claude, ChatGPT and Grok
Add AiFuse once as a custom connector, then ask for a second opinion without leaving the app. Another model reviews its answer: what's right, what's wrong or missing, and a corrected conclusion.
See it work
In ChatGPT, someone asks whether a VPN makes them anonymous online. ChatGPT says no: websites can still track them through cookies, fingerprinting and logged-in accounts. They type “Use AiFuse for a second opinion from Claude, in three lines”. Claude's answer appears in an AiFuse card that names the model and the cost. It agrees, and adds that the VPN provider itself can see their real IP and unencrypted traffic, that DNS or WebRTC leaks can expose them, and that paying by card can tie the account to them. Then ChatGPT gives its own view.
Set it up in two minutes
- Open Settings, then Connectors.
- Choose Add custom connector.
- Set the name to AiFuse.
- Paste the URL.
- Press Continue.
- Sign in to AiFuse, then press Allow.
Free Claude plans allow one custom connector.
- Open chatgpt.com/plugins (or Plugins in the sidebar), then press Add at the top right.
- Choose Create custom MCP server.
- Set the name to AiFuse.
- Paste the URL into Server URL.
- Set Authentication to OAuth.
- Tick the risk acknowledgement, then press Create as a plugin.
- Sign in to AiFuse, then press Allow.
These steps are for ChatGPT on the web. Don't see the option? Turn on Developer mode in Settings, Security and login.
- Open grok.com/connectors.
- Press New Connector, then Custom.
- Set the name to AiFuse.
- Paste the URL.
- Press Add Connector.
- Sign in to AiFuse, then press Allow.
Open to all Grok users.
No AiFuse account yet? Create one during the sign-in step: confirm your email, then press Continue.
What to type
“Use AiFuse for a second opinion”
AiFuse picks the model.
“Use AiFuse for a second opinion from ChatGPT”
You pick.
“…from ChatGPT and Claude”
Two opinions side by side.
“…and include our whole conversation”
By default, only your last question and its answer are sent.
Names it understands: ChatGPT or GPT, Claude, Gemini, Grok, Mistral, DeepSeek, Kimi, GLM, Perplexity.
Which model answers
Name a provider and its default model answers on paid runs. While your free runs last, its free model answers instead, if it has one.
Name none and AiFuse goes down this list, in order: your Primary, then your Secondary (Account, Second opinion defaults), then Claude, ChatGPT, Grok, Mistral, Gemini. While you have free runs, it takes the first one with a free model. It never picks the app you're asking from.
What it costs
Every new account starts with a few free runs, shared with Auto and Single in the workspace.
After that you pay per use from your AiFuse balance: no subscription, and most second opinions cost a fraction of a cent, though a long answer reviewed by a flagship model costs more.
Every answer names the model that wrote it, and the cost is always on your usage page.
If your balance is empty, nothing is sent and nothing is charged; you get a link to top up.
What's sent and what's kept
The app sends your question and, for a second opinion, the answer to review. It goes only to the provider that answers.
AiFuse doesn't save the question or the answers. It keeps the usage line: model, cost, time, and which app asked.
The answer is held in memory for up to two minutes, so a repeated request isn't charged twice. It is then discarded and never written to storage.
You can remove the connector in the app at any time.
The details are in our privacy policy.
Questions
Can it read files I attached in the app?
It works with text. The app may include relevant text from your file.
Why does the app reword the AiFuse line?
Each app presents results in its own way. The model and cost are always on your usage page.
Is it the same AiFuse as the workspace?
Same balance. The workspace adds Duo, Fusion, projects and the Art Studio.