r/PromptEngineering
389k members
r/PromptEngineering is a subreddit with 389k members. The most common kinds of discussions are solution requests and advice requests, and the community frequently discusses prompt, ai, engineering, tool, and system.
Prompt engineering is the application of engineering practices to the development of prompts - i.e., inputs into generative models like GPT or Midjourney.
Popular Themes in r/PromptEngineering
#1
Solution Requests
: "my friend built GoblinMD : an offline desktop app to pack code & PDFs into prompts for LLMs (open source, built in Python & PyQt5)"
12 posts
#2
Advice Requests
: "My prompts got 3x better the day I stopped writing more instructions and started writing more examples instead"
9 posts
#3
Pain & Anger
: "Why most companies are failing at AI adoption (and it's not the reason you'd expect)"
2 posts
#4
Ideas
: "Built a prompt optimization tool with 2,500+ users, but it still feels like I’m not doing enough"
1 post
Popular Topics in r/PromptEngineering
#1
Prompt
: "i found a Prompt hack so stupid it should not work. it works every time."
233 posts
#2
Ai
: "Fable 5's guardrAils got bypassed in 48 hours. Here's what that actually means for anyone building customer-facing Ai."
198 posts
#3
Engineering
: ""Prompt Engineering" for agents is the wrong mental model. You're actually writing a distributed systems runbook."
45 posts
#4
Tool
: "Claude Code Source Deep Dive (Part 5) — Literal Translation & Tool-Call Loop Self-Repair Core Mechanism"
42 posts
#5
System
: "How do you prompt an AI agent that has write access to real world Systems"
33 posts
#6
Model
: "Do prompts really change how different AI Models behave, or is it just hype?"
29 posts
#7
Claude
: "This Claude prompt gave me the most accurate outside-perspective of myself I’ve ever read."
25 posts
#8
Research
: "The "second brain" pattern for AI development isn't new — but almost nobody has actually implemented it properly. Here's what it looks like when you do."
19 posts
#9
Project
: "I worked on this Project for 6 months"
18 posts
#10
Development
: "The "second brain" pattern for AI Development isn't new — but almost nobody has actually implemented it properly. Here's what it looks like when you do."
17 posts
Flair Used in r/PromptEngineering
#1
General Discussion
: "I AM CANCELLING MY CLAUDE PRO SUBSCRIPTION (and here's my honest take)"
68 posts
#2
Prompt Text / Showcase
: "I paste a rough idea into Claude and make it interview me before it writes anything. The questions it asks are better than the draft most prompts produce."
35 posts
#3
Quick Question
: "Do prompts really change how different AI models behave, or is it just hype?"
18 posts
#4
Tools and Projects
: "I built a local PDF-to-Markdown converter so you don't have to burn LLM tokens."
17 posts
#5
Tips and Tricks
: "An elegant prompting technique from Anthropic's Amanda Askell that changes how you learn complex concepts"
14 posts
#6
Tutorials and Guides
: "The "second brain" pattern for AI development isn't new — but almost nobody has actually implemented it properly. Here's what it looks like when you do."
12 posts
#7
Ideas & Collaboration
: "I built this 8 months ago, got scared, and almost never shared it — R-CoT, a reasoning framework for LLMs"
10 posts
#8
Requesting Assistance
: "Please write a prompt to minimize sycophancy, taking sides, flattering, echo-chamber, "yes-man", assumptions, and improve objectivity, brutal honesty, neutrality, and real-world verity."
9 posts
#9
Other
: "Anthropic is giving 10,000 open-source maintainers 6 months of Claude Max 20x for free"
5 posts
#10
Self-Promotion
: "I Built a Claude Code skill that makes Claude admit when it half-assed your task."
4 posts
Member Growth in r/PromptEngineering
Yearly
+216k members(125.3%)
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Last updated: June 21, 2026