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Reddit posts about a topic filtered and summarized by AI

by Mindketn8n workflowResearch
Newversion 1 · updated
Nodes10Apps2Like

Overview

  1. When clicking "Execute Workflow"
  2. Reddit
  3. IF
  4. Set
  5. OpenAI Classify
  6. Merge
  7. IF1
  8. OpenAI Summary Backup
  9. Merge1
  10. SetFinal
Reddit posts about a topic filtered and summarized by AI, picture 1
‹2 / 2›

An n8n workflow that searches Reddit for a keyword, keeps recent posts with some upvotes, has OpenAI check each is about the topic and writes a one-sentence summary.

Reddit posts about a topic filtered and summarized by AI is an n8n workflow in the Research category, listed by Mindket. It is free. This is version 1, last updated on . Download it on this page or copy its JSON, then import it into an n8n canvas. Nothing runs until you activate it in n8n.

At a glance

Runs in
  • n8n Cloud: import the file there and run it by hand
  • Your own n8n server: the same file and steps
  • Reddit: the search
  • OpenAI: the topic check and the summary

Platform

n8nWorkflow automation, in n8n’s cloud or on your own server
Connects 2 apps

How it works

Trigger

Manual run

It starts when you click Execute Workflow in n8n:

  • The keyword, set in Reddit
  • The topic named in the check, set in the OpenAI Classify prompt
  • The upvote count and age, set in IF

Actions

  1. Reddit is searched for the keyword, newest first
  2. Posts older than a week, with no text or under five upvotes, are dropped
  3. OpenAI says whether each remaining post is about the topic
  4. OpenAI writes a one-sentence summary of each post that is
  5. The summary, the upvotes, the subreddit, the date and the link are kept

Result

A list of recent Reddit posts about the topic, each with a one-sentence summary

Integrations

What you need before you start.

Reddit

Search

Returns new posts that mention the keyword.

NeedsA Reddit app credential

OpenAI

Check and summary

Says whether a post is about the topic and summarizes it.

NeedsAn OpenAI API key

Workflow check

Checked by Mindket on 13 Nov 2026

Steps
10 steps, starting by hand
AI
No step calls an AI model
Sign-ins
Signs in to: Reddit and OpenAI
API keys
No API key is left in the file
Step types
Mindket’s checker reads all 6 of its step types

Read from the workflow’s file, not from a run.

About

What it is

This n8n workflow watches Reddit for a topic. It searches all of Reddit for new posts that mention a keyword, which the file sets to n8n. It keeps the recent posts that have text and at least five upvotes. OpenAI checks each one is about the topic and writes a one-sentence summary of those that are. Ten nodes run it, beside four sticky notes.

Who it suits

Community managers and founders who want a short list of what people say about a product or a field. Skip it if you cannot get Reddit API access or cannot send post text to OpenAI.

Who uses it, and how
IndustryWho uses itHow they use itExample
CommunityCommunity managersFind threads about their productA manager sees which new posts name the product and what they say.
ProductProduct teamsCollect user feedbackA team reads a one-line summary of each post that raises a problem.
MarketingBrand teamsTrack mentionsA brand lead keeps a list of posts that mention the brand.
ResearchAnalystsFollow a topic over timeAn analyst gathers the week’s posts about a technology.

You need some n8n, a Reddit app and an OpenAI key: import a file, add two credentials and set the keyword.

Where to use it

Any n8n that can reach Reddit and OpenAI will run it. The result is a list of items inside n8n, which you can send on to a sheet or a message.

  • n8n Cloud: import the file there and run it by hand
  • Your own n8n server: the same file and steps
  • Reddit: the search
  • OpenAI: the topic check and the summary

Setup

Download saves a zip with workflow.json and Mindket’s setup notes in your downloads folder. Setup takes two credentials and a keyword.

What you need first
NeedDetail
n8nOn n8n Cloud or on a server of your own
RedditAn app credential for n8n’s Reddit node
OpenAIAn API key
  1. In n8n, create a workflow, open its menu, choose Import from File and pick workflow.json.
  2. Add a Reddit credential and select it in Reddit.
  3. Add an OpenAI credential and select it in OpenAI Classify and in OpenAI Summary Backup.
  4. To watch another topic, change the keyword in Reddit and the topic named in the prompt of OpenAI Classify.
  5. Click Test workflow.

How to use it

Click Test workflow. The posts that pass come out of SetFinal with a summary, the upvotes, the subreddit, the date and the link. Try it on a small keyword first.

What to change for a different result
To changeWhere
The topicThe keyword in Reddit and the prompt in OpenAI Classify
The filtersIF
The summaryThe prompt in OpenAI Summary Backup
When it runsThe trigger node

Example

A community manager searches for the name of a self-hosted tool. Reddit returns a hundred new posts, and many only use the name in passing.

The filter drops the old, short and low-scoring ones. OpenAI says which of the rest are about the tool, and the summaries read like one-line headlines, each with the subreddit and a link.

For newcomers and experts

If you are new. n8n draws a workflow as boxes joined by lines, and each box, a node, does one job. Here one box searches Reddit, one filters, one asks OpenAI for a yes or no, and one writes the summary. Try it with a keyword that gives only a few posts.

For experts. The two AI steps are HTTP Requests to Chat Completions. Two Merge nodes join each answer to the post’s details by position, and the last one prefers its first input.

Where to look closer
NodeWhat it doesWhat to know
RedditSearches all of Reddit, newest firstLeft alone, the node returns up to 100 posts
OpenAI ClassifyAsks for Yes or NoIt names gpt-6-luna and sets reasoning effort to none
IF1Ends the run when the answer contains NoIt reads choices[0].message.content
Merge1Joins the summary to the detailsIt prefers input 1, so the summary’s choices wins

Good to know

Only the first 500 characters of each post are read, so a post that names the topic later is missed.

  • The repair: both AI steps were n8n’s older OpenAI text node, whose default model gpt-3.5-turbo-instruct OpenAI’s deprecations page, read on 12 November 2026, lists as shut down on 28 September 2026. They are now HTTP Requests to Chat Completions with gpt-6-luna
  • The edit step: the disabled OpenAI Summary node used an endpoint shut down in January 2024, so it is gone
  • Cost: with the default limit, one run can make up to 200 OpenAI calls
  • Access: Reddit announced a Responsible Builder Policy in November 2025 that asks new API users for approval, and its Data API terms ask for a separate agreement for commercial use
  • Not run: this copy was not run against Reddit or OpenAI
  • Your data: the text of each post goes to OpenAI
  • Credentials: the JSON holds none

README and files

README

Reddit posts about a topic filtered and summarized by AI

An n8n workflow that searches all of Reddit for new posts that mention a keyword, which the file sets to n8n. It keeps the recent posts that have some text and at least five upvotes, asks OpenAI whether each one is about the topic and writes a one-sentence summary of those that are.

What is inside

  • workflow.json: the workflow as n8n exports it, fourteen nodes: ten that do the work and four sticky notes. It holds no credential.
  • README.md: these notes.

What we changed from the original copy

  • The credential links are gone. Select your own for Reddit and OpenAI.
  • Both AI steps were n8n's older OpenAI text node, which calls the completions API with its default model, gpt-3.5-turbo-instruct. OpenAI's deprecations page, read on 12 November 2026, lists that model as shut down on 28 September 2026 with gpt-5.6-terra as its replacement, and the model page for gpt-5.6-terra shows the legacy completions endpoint as not supported. The two steps are now HTTP Request nodes that call Chat Completions with gpt-6-luna, using your OpenAI credential.
  • Both calls set reasoning effort to none and cap the reply (max_completion_tokens 32 for the yes or no, 128 for the summary), so the answers stay short and quick.
  • The disabled OpenAI Summary node used the edit endpoint. OpenAI's deprecations page lists the edit models and /v1/edits as shut down on 4 January 2024, so that node is gone.
  • The answer used to arrive as text or choices[0].text. Now it is choices[0].message.content, and IF1 and SetFinal read it there.
  • The summary and the earlier answer share the field choices. By default the last merge would keep the earlier one, so Merge1 now prefers its first input, the summary, at the top level.
  • The note named What we learned held advice about the old node's token default and two links. It is replaced by a short note on these changes.
  • Nothing else.

Before you start

  • An n8n instance, on n8n Cloud or your own server.
  • A Reddit app credential for n8n's Reddit node. Reddit announced a Responsible Builder Policy on 11 November 2025 that asks new API users to request approval first, so read its current terms before you rely on access. Its Data API terms, last revised 20 July 2026, ask for a separate agreement for commercial use.
  • An OpenAI API key.

Set it up

  1. In n8n, create a workflow, open its menu and choose Import from File. Pick workflow.json.
  2. Add a Reddit credential and select it in Reddit.
  3. Add an OpenAI credential and select it in OpenAI Classify and in OpenAI Summary Backup.
  4. To watch another topic, change the keyword in Reddit and the topic named in the prompt of OpenAI Classify.
  5. Click Test workflow.

How a run goes

  1. When clicking "Execute Workflow" starts the run by hand.
  2. Reddit searches all of Reddit for the keyword, newest first. The node returns up to 100 posts when you leave its limit alone.
  3. IF keeps a post when it has at least five upvotes, some body text and a date within the last seven days.
  4. Set keeps the upvotes, the subreddit's size, the first 500 characters of the text, the subreddit, the date and the link.
  5. OpenAI Classify asks whether the post is about the topic and answers Yes or No. Merge joins that answer to the details by position.
  6. IF1 ends the run for a post when the answer contains No. For the others, OpenAI Summary Backup writes a one-sentence summary, and Merge1 joins it to the details.
  7. SetFinal keeps the upvotes, the subreddit's size, the subreddit, the summary as bulletSummary, the date and the link.

Change the look

  • The topic: the keyword in Reddit and the prompt in OpenAI Classify.
  • The filters: the upvote count, the age and the empty-text test in IF.
  • The summary: the prompt in OpenAI Summary Backup.
  • What leaves: the fields in SetFinal, or add a node after it that writes to a sheet or sends a message.
  • When it runs: swap the manual trigger for a schedule.

Good to know

  • Only the first 500 characters of each post are read. A post that names the topic later than that is missed, as the workflow's own note says.
  • Each post that passes the filter costs one OpenAI call for the check, and one more for the summary when it is about the topic. With the node's default limit that can reach 200 calls a run.
  • The yes or no test looks for No anywhere in the answer. A reply that adds other words is judged on that.
  • This copy was not run against Reddit or OpenAI.
  • The text of each post goes to OpenAI.
  • The JSON holds no credential.
Files
NOTICE.md  569 B
README.md  5 KB
workflow.json  11 KB

3 files, 17 KB, downloaded as a zip.

What’s new

  • Version 1 · 2026-11-12

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