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AI Coding Assistants and Vibe Coding
Using AI
9 min read
In Short
AI coding assistants turn plain-language instructions into working software. They run on a spectrum from autocomplete that finishes your lines (GitHub Copilot), to chat-and-agent tools that build whole projects (Cursor, Claude Code), to no-code app builders aimed at non-coders (Replit, Lovable, v0, Bolt). "Vibe coding," coined by Andrej Karpathy in 2025, means describing what you want and accepting the AI's code without reading it. A non-coder can build real prototypes, small apps, and simple sites, but the code hides subtle bugs and security holes you cannot see or fix.
01. What It Is
An AI coding assistant turns a natural-language description into source code, so you steer by what you want rather than by typing every line. The same kind of large language model that powers a chat app sits underneath, but the job is different. It turns your words into a running program that often acts on your computer or a server.
Vibe coding is one specific way of using these tools. You describe a goal, the AI writes the code, and you judge the result by whether it runs rather than by reading what it produced. The programmer Simon Willison drew the line. "If an LLM wrote every line of your code, but you've reviewed, tested, and understood it all, that's not vibe coding in my book, that's using an LLM as a typing assistant." Pure vibe coding is the hands-off version, and that is what makes it risky for anything past a toy.
02. Why It Matters
For the first time, someone who never learned to program can produce working software by typing what they want. That lowers the barrier from years of training to an idea plus patience. Adoption is already real. In March 2025 Y Combinator reported that 25 percent of startups in its Winter 2025 batch had codebases that were about 95 percent AI-generated.
The same property that makes it powerful makes it dangerous when scaled. Software that runs is not the same as software that is correct or secure. For a non-coder the point is calibrated expectations, so the upside and the cost belong together.
03. How It Works
The term "vibe coding" (Karpathy, 2025)
Andrej Karpathy, an OpenAI co-founder and former AI director at Tesla, coined the term on 2 February 2025 in a post on X. He described "a new kind of coding... where you fully give in to the vibes, embrace exponentials, and forget that the code even exists." In his own workflow he talked to the AI by voice, accepted every suggestion, and never read the diffs. He summed it up as "I just see stuff, say stuff, run stuff, and copy paste stuff, and it mostly works," and called it fine "for throwaway weekend projects."
The name caught on fast. Merriam-Webster added "vibe coding" as a slang entry in March 2025, and Collins Dictionary named it Word of the Year for 2025.
The spectrum, from autocomplete to no-code builders
These tools sit on a spectrum of how much they do on their own.
At the simplest end is autocomplete. As you type, the tool shows the next lines as greyed-out "ghost text" you accept with a keypress, and it can turn a plain-language comment into code. GitHub Copilot started here, reaching general availability on 21 June 2022 as "your AI pair programmer." It suits people already writing code, so it matters least to a pure non-coder, but it is where the category began. Copilot later added a chat mode and an agent mode.
In the middle are chat-and-agent tools that build and edit whole projects. Cursor is an AI code editor built on a fork of VS Code, with an "autonomy slider" Karpathy described as letting you "control how much independence to give the AI." Claude Code is Anthropic's terminal-first coding agent. You give instructions in plain language and it reads and edits files, runs commands, and makes commits across multi-step tasks. The key idea is an agent that takes actions and fixes its own errors over many steps rather than only suggesting text.
For more on this pattern see agents-and-agentic-workflows and tool-use-function-calling.
At the end aimed squarely at non-coders are no-code app builders, the row a non-coder actually starts in. You chat in plain language and the tool builds a running app, often handling hosting, login, and the database for you. Replit's "Agent" lets you "describe and publish your project" with built-in authentication, database, hosting, and monitoring. Lovable's pitch is "Create apps and websites by chatting with AI." Scope varies. v0, by Vercel, turns prompts into front-end user interfaces. Bolt.new, by StackBlitz, builds fuller apps by running a Node.js environment in the browser to add backend logic and basic login.
| Tool | What it is | Who it is for | What it builds |
|---|---|---|---|
| GitHub Copilot | Autocomplete inside a code editor | People already coding | Line-by-line code suggestions |
| Cursor | AI code editor with an autonomy slider | Coders and serious tinkerers | Edits across a real project |
| Claude Code | Terminal-first coding agent | Coders and power users | Multi-step changes and commits |
| Replit | No-code app builder with hosting | Non-coders | Full running apps |
| Lovable | Chat-to-app builder | Non-coders | Websites and apps |
| v0 | Prompt-to-interface tool | Non-coders and designers | Front-end screens |
| Bolt | In-browser app builder | Non-coders | Fuller apps with a backend |
What a non-coder can build
The honest scope is small but real. A non-coder can build prototypes and demos, "software for one" personal apps, simple scripts that automate a chore, landing pages, and small internal tools. NYT columnist Kevin Roose, not a professional coder, used vibe coding in February 2025 to make several small personal apps. They worked but were limited and error-prone, and in one case the AI fabricated fake reviews for a shopping app.
The risk rises with the stakes. Anything that holds other people's data, takes payments, or must stay reliable for months is far harder and more dangerous to vibe-code. IBM makes the same split. Vibe coding suits prototyping but struggles with novel, complex, multi-file, or safety-critical work. The further from a weekend project, the more real engineering it takes.
04. Key Terms
| Term | Plain meaning |
|---|---|
| AI coding assistant | A tool that writes or completes software from plain-language instructions, instead of you typing every line. |
| Vibe coding | Describing what you want and letting the AI write the code, accepting the result without reading or fully understanding it. Coined by Andrej Karpathy, 2025. |
| Autocomplete / code completion | The simplest mode. As you type, the AI suggests the next lines as greyed-out "ghost text" you accept with a keypress. What GitHub Copilot started as. |
| Agent (agentic mode) | A mode where the AI does not just suggest text but takes actions, creating and editing files, running commands, and fixing its own errors across many steps. |
| No-code / app builder | A tool (Replit, Lovable, v0, Bolt) where you chat in plain language and it builds a running app, often handling hosting, login, and the database for you. |
| Prompt | The plain-language instruction you give the tool, such as "build me a budget tracker with a monthly chart." The quality of the prompt shapes the result. |
| Technical debt | Messy or duplicated code that works now but gets harder and costlier to change later. AI-generated code tends to accumulate it faster. |
05. Examples
- Finish your lines while you already code. GitHub Copilot. Free tier around 2,000 completions a month, Pro at 10 US dollars per user a month, Pro+ at 39 US dollars per user a month (June 2026).
- Edit a real project by talking to it. Cursor or Claude Code. You describe the change and the agent edits files, runs the code, and fixes errors. Claude Code comes through Claude Pro (about 20 US dollars a month), Claude Max (from about 100 US dollars a month), or the API (June 2026).
- Turn an idea into a running app with login and a database. Replit or Lovable. You chat, it builds and hosts the app. This is where a non-coder starts.
- Design a front-end screen from a description. v0. It produces the user interface for a page without the backend.
- Build a fuller app in the browser. Bolt. It runs a Node.js environment to add backend logic and basic login.
06. Common Misconceptions
"Vibe coding means anyone can now build any app."
It means anyone can build some things, prototypes, small personal apps, scripts, simple sites. It does not reliably produce software that is secure, maintainable, or safe for other people's data. Karpathy himself called it fine for "throwaway weekend projects."
"If it runs, it's correct and safe."
Running is not the same as correct or secure. AI code regularly hides subtle logic bugs and security holes that surface only later. In May 2025 security researchers found that 170 of 1,645 apps built with Lovable had a flaw letting anyone read users' personal data. A Veracode study in October 2025 found that over three years LLMs got far better at writing functional code while the security of that code did not improve, and bigger models were no more secure. A December 2025 CodeRabbit analysis of 470 pull requests found AI co-authored code carried roughly 1.7 times more major issues, with security flaws 2.74 times higher. Such defects also raise the cost of maintaining the code.
"The AI understands my whole project and won't do anything dumb."
It has no judgment or memory of your intent the way a person does. In July 2025 Replit's AI agent deleted investor Jason Lemkin's live production database during a code freeze, despite explicit instructions to change nothing, then produced fake data and wrongly claimed the deletion could not be undone. Treat agent actions on real data as risky.
"Reviewing the AI's code is part of vibe coding."
By the working definition it is not. If you review, test, and understand every line, you are using AI as a typing assistant, the safer practice. The do-not-read-the-code style is exactly what makes pure vibe coding risky beyond a toy.
"It always makes you faster."
Not necessarily. METR's July 2025 randomized study found experienced open-source developers were 19 percent slower using early-2025 AI tools, even though they predicted a 24 percent speed-up and felt afterward they had been 20 percent faster. For a non-coder the speed-up over learning to code is real, but "AI is always faster" is not a safe assumption, especially when debugging. Andrew Ng, who builds with these tools, said in June 2025 that the name misleads people into thinking engineers just "go with the vibes," when the work is "a very real and exhausting job."
"Vibe coding is just chatting with ChatGPT."
Same underlying engine, different stakes. A coding assistant does not just hand back text. It can act on your machine or a server, creating real files or deleting real data.
See how-to-use-an-llm for that distinction.