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Thanks to Buf for sponsoring this newsletter. Let’s get back to this week’s thought!

Intro

With the speed of writing code increasing due to AI coding tools, skills like critical thinking, pure problem-solving, and being good at reviewing/verifying are more important than ever.

But what’s alarming is that a lot of engineers increase the speed of the pure output, without verifying if the output is actually of the right quality.

Based on the recent State of Code Developer Survey Report from Sonar, a lot of engineers (96%) don’t trust the output, which is a decent number, but only 48% verifies it, which is alarming in my opinion.

Some other interesting data from the report:

• 61% agree that AI often produces code that looks correct but isn’t reliable

• 57% of engineers worry that using AI risks exposing sensitive company or customer data

• 35% of engineers use AI via personal accounts

I’ve taken a close look at the report, and in this article, I am sharing the data of the most important parts, and my thoughts on them.

If you like these kinds of articles, where I go over a highly relevant report and share my insights on it, you’ll also like these articles:

OpenAI's Report: The State of Enterprise AI Gregor Ojstersek · December 14, 2025 Read full story

The Impact of AI on the Performance of Software and Systems Gregor Ojstersek · November 19, 2025 Read full story

How Engineering Teams Set Goals and Measure Performance Gregor Ojstersek · October 22, 2025 Read full story

The Impact of AI on Engineering Teams Gregor Ojstersek · September 10, 2025 Read full story

The State of Software Development in 2025 Gregor Ojstersek · August 3, 2025 Read full story

The State of Engineering Leadership in 2025 Gregor Ojstersek · June 15, 2025 Read full story

Let’s start!

Demographics of the Survey

The survey is based on 1149 respondents, either full-time employed or self-employed in a tech role, with the majority working in software engineering.

All of the respondents either write code or manage engineers and had used AI as part of their job within the year 2025. The survey was conducted in October 2025.

1. How Engineers Use AI

Let’s start with how engineers are using AI in current times.

1.1 72% Engineers Who Have Tried AI Use it Every Day

There is no surprise here, except I’d even expect the number to be higher. AI-assisted engineering is the best way to build software these days, and I definitely recommend that everyone use it daily.

Take a look at this article, where you can find a prompt that’ll help you to be more productive with software engineering tasks:

How to Use AI to Help With Software Engineering Tasks Gregor Ojstersek and Steven Levey · October 12, 2025 Read full story

1.2 42% of the Code is Currently AI-Generated or Assisted

This data also confirms my thoughts that I mentioned above.

AI-assisted engineering is just going to be more and more important, and as we can see from the data, engineers surveyed expect that AI-generated code should rise from 42% (today) to 65% in 2027.

Which, I agree with, and also what I am hearing based on discussing with many engineers and engineering leaders across the industry. Especially in a recent discussion with the Engineering Lead from the OpenAI Codex team (deepdive coming soon).

1.3 Engineers are Using AI Across All Different Kinds of Projects

Prototypes and production software for non-critical workflows are where AI is used the most. And then also customer-facing apps and business-critical services are not so far behind.

Especially, what I am hearing a lot from different engineering leaders is that building internal tools that make everyone more productive is a really great use case for AI.

You can quickly build an internal tool, without focusing on quality as much, since it might not be needed in a couple of months anymore.

1.4 AI Use Cases

Writing documentation is the #1 use case, followed by explaining and understanding existing code.

I guess the options to choose from were more engineering-related, since I definitely miss note-taking of meetings and also summarization of threads or messages.

Those 2 use cases have been mentioned to me by a lot of engineers and engineering leaders. To find out more use cases, I definitely recommend reading these 2 articles:

How to Use AI to Be a Great Engineering Leader Gregor Ojstersek · May 11, 2025 Read full story

How to Use AI to Increase Software Development Productivity Gregor Ojstersek · March 9, 2025 Read full story

2. How Much Do Engineers Trust AI

Let’s now go to a very important part of the report, and that is: how trustworthy is AI’s output.

2.1 96% of Engineers Don’t Fully Trust AI-generated code

I would like to see this number be 100%, as you should never fully trust AI-generated code, at least not at this time. You should always check if the outputted code is what is expected, and not just blindly trust.

I saw too many engineers just blindly creating PRs with poor AI-generated code, which can then be quite problematic for reviewers.

The accountability should always be on the engineer who is using AI and not on AI. That’s very important to understand.

2.2 Only 48% of Engineers Always Check Their AI-Assisted Code Before Committing

Now, this is the most alarming data from the report. Only 48% of engineers always check their AI-generated code before committing.

This is the exact reason why there are so many bad PRs being opened and why many engineers may hate AI in general. A lot of engineers use AI as a source of truth and do not take full accountability of the code.

Rather, just submit a PR with bad quality code and let the reviewers do the heavy lifting to check all the code. From talking with many engineers, and also from my experience, this is really frustrating.

So, make sure to check your code before submitting a PR. If you submit a PR full of AI-generated slop, you’ll lose a lot of credibility in my eyes.

2.3 61% of Engineers Agree That AI Often Produces Code That Looks Correct but Isn't Reliable

Again, I would love to see this percentage a bit higher, as it’s really important to ensure that the code is going to be reliable.

You do it either by writing more accurate prompts, adding additional context, constraints, and guardrails. And of course, check the output yourself and ensure it’s on point.

2.4 61% of Engineers Agree That it Requires a Lot of Effort to Get Good Code From AI

I agree with this, it depends a lot on what technologies you use and also how complex your codebase is. Technologies depend a lot.

A good example I am hearing is that a lot of startups these days decide to go with the Ruby on Rails framework to build their MVP.

And the reason for this is that it’s a very opinionated framework, and you have clear guidelines and design patterns. While in most of the JS frameworks, there’s a lot more flexibility.

AI’s output works best when you have as many guardrails and constraints as you can. Angular framework works well as well.

2.5 AI Impact Is Mostly Seen In Developer Productivity And Time-To-Market, But There's Room For Growth In Multiple Other Aspects

I would love to see the increase in feature or fix release frequency, code quality, and code maintainability as well! And I think, next year, those are going to be higher numbers.

2.6 Code Quality Review & Validation Are The Most Important Skills For Engineers In The AI Era

Based on the data, we can see that reviewing and validating code is the #1 most important skill, while also efficient prompting is very important as well.

To learn how to prompt well, read this extended guide I did together with OpenAI’s Product Lead Miqdad Jaffer:

Guide to Prompt Engineering Gregor Ojstersek and Miqdad Jaffer · July 2, 2025 Read full story

3. Top AI Tools, And How They’re Used

And last, but not least, let’s take a look at the top AI tools and how engineers are using them.

3.1 GitHub Copilot and ChatGPT Lead the Field

A bit surprised that GitHub Copilot is on top, but I get it, it’s been one of the first AI coding tools available, and it’s used heavily among VS Code users.

And also ChatGPT is of course no surprise. Followed by Claude Code, Gemini, and Cursor. I think Claude Code today would be a bit higher, and OpenAI Codex would be higher as well.

There has been a lot of good feedback on Codex from engineers I talked to, and I tried it as well and liked it. The Codex app doesn’t give you the full IDE (which I miss), but overall, it gives you so many possibilities that you can use it for literally any task you are working on.

3.2 Average Engineering Team Uses 4 Different AI Tools

Seems like the most common are teams that use 3 AI tools, while the average is 4. From my experience, a range of 2-5 is a good range, and the data confirms it.

3.3 A Lot of Engineers Use AI Tools on Their Personal Account

This is something that companies need to do better. It’s crucial to give your people the tools to be successful. Over 50% of engineers use ChatGPT through their personal account, and there is a high percentage on other tools as well.

If you are an engineering leader, reading this article, make sure to focus on giving your engineers the tools they need. Of course, my recommendation is not just to focus on ALL the tools, but to give what the majority is asking for.

3.4 AI Coding Tools Used By Company Size

This is interesting data, especially regarding ChatGPT, and the larger the company, the less they use ChatGPT.

And also, we can see Claude Code being used the most in smaller companies.

Last words

There is much interesting data from this report, and one thing is certain:

Only 48% of engineers checking AI-generated code before committing is not enough!

We need to do better than this in our industry. Let’s end this article with the following:

The fastest way to lose your credibility is to blindly commit AI-generated slop, and even worse, if you blame AI for it.

The overall accountability should always be on you.

You got this!

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