Does connecting ChatGPT to CommunityMentions cost anything?

Our server is free and needs no account or key. If you call it through the OpenAI API you pay OpenAI for the tokens; our test call used 765 tokens on gpt-4.1-mini.

Can ChatGPT post on Reddit through this connection?

No. The server has two tools, find_subreddits and get_subreddit, and both only read our subreddit data.

Is the ChatGPT route the same as the API route?

Both connect to the same server URL. The API call is what we ran on November 9, 2026. The ChatGPT steps are OpenAI's own, and your account or workspace policy decides whether the option appears.

Which OpenAI model should I use?

We ran gpt-4.1-mini because a lookup like this is a small job. Any model that supports the Responses API MCP tool can call the same URL, and we have only run this one.

Connect ChatGPT to CommunityMentions: MCP Setup, Real Output

Quick picks: how do you use OpenAI?

You chat in ChatGPT: add a custom MCP server with the URL below (these are OpenAI's steps; we did not click through them).
You build on the OpenAI API: use the Responses API call below. It's the route we ran.
You use Claude instead: connect Claude to CommunityMentions.
You want the raw JSON: read the MCP server reference.
You want one answer with no setup: the subreddit finder.

Add it inside ChatGPT

These are OpenAI's steps, from its developer page on connecting a server, read November 9, 2026. We ran the API route below and did not click through these in a signed-in ChatGPT account. OpenAI says account and workspace policies apply to adding custom MCP servers, so if the option is missing, ask whoever runs your workspace.

Open ChatGPT Plugins, select the plus button, then Add custom MCP server.
Enter a name (CommunityMentions) and a short description.
Under Connection, choose a public endpoint and enter https://communitymentions.com/api/mcp.
Configure authentication (this server takes no login, so choose no authentication if the screen offers it), then review the risk warning and select I understand and want to continue.
Select Create as a plugin and review the tools ChatGPT discovers; you should see find_subreddits and get_subreddit.
Install the plugin, start a new conversation, type @ in the prompt box and select it.

Call it from the OpenAI API

This is the request we sent on November 9, 2026, shortened only by leaving out the max_output_tokens field. OpenAI's Responses API takes a remote MCP server as a tool. By default it asks for your approval before sharing data with a server; we set require_approval to never because both tools only read. OpenAI's guide says "Only use remote MCP servers you trust", and that advice applies here too.

curl https://api.openai.com/v1/responses \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-4.1-mini",
    "input": "We sell an invoicing app for freelancers. Which three subreddits fit it, and how often do AI answers cite each one? Use the CommunityMentions tool and give the data date.",
    "tools": [{
      "type": "mcp",
      "server_label": "communitymentions",
      "server_url": "https://communitymentions.com/api/mcp",
      "require_approval": "never"
    }]
  }'

What done looks like: the real output

The response listed both tools, made one call and answered. The status was completed, with 553 input tokens and 212 output tokens. This is the tool call and the answer, unedited apart from line breaks:

mcp_list_tools: find_subreddits, get_subreddit
mcp_call: find_subreddits {"description":"invoicing app for freelancers"}

Three subreddits that fit an invoicing app for freelancers are:

1. r/Freelancers (careers, writing and learning) - 54,634 members, cited under 50 times in AI answers.
2. r/AppBusiness (SaaS and startups) - 123,359 members, cited under 50 times in AI answers.
3. r/Upwork (careers, writing and learning) - 75 AI citations.

This data is current as of the latest available date on CommunityMentions.

Here are the subreddit links for more details:
- r/Freelancers: https://communitymentions.com/subreddits/freelancers?utm_source=mcp
- r/AppBusiness: https://communitymentions.com/subreddits/appbusiness?utm_source=mcp
- r/Upwork: https://communitymentions.com/subreddits/upwork?utm_source=mcp

Why the answer gave no date

We asked for the data date and the model didn't state one. The text the tool returns has no date in it; the date sits in the tool's structured result as data_as_of, and the model answered from the text. If you need the date, read data_as_of from the structured result or check the MCP server reference. The initialize response on November 9, 2026 gave 2026-11-08.

What "under 50 AI citations" means

We don't publish a count below 50, so two of the three picks above show that phrase in place of a number. r/Freelancers still fits this product. If you would rather rank by citations than by fit, say so in your prompt. The data holds 211 subreddits.

What ChatGPT can't do through this server

Post, comment, vote or change anything on Reddit. Both tools only read.
See your account, your comments or any client's data.
Tell you what ChatGPT itself will cite tomorrow. The counts are history, and they combine OpenAI models, Perplexity and Gemini.
Quote our prices. The tools carry subreddit data only; prices are on our pricing section.
Look up health, legal-help or adult communities, which are left out.

Sources

OpenAI: connect from ChatGPT, read November 9, 2026.
OpenAI: MCP and connectors in the Responses API, read November 9, 2026.
The live endpoint https://communitymentions.com/api/mcp, called through the Responses API on gpt-4.1-mini on November 9, 2026. Totals come from its initialize response, on data dated November 8, 2026.

Connect ChatGPT to CommunityMentions