Hello GPT-5.2! Is it a coding beast?

0:00 GPT5.2 just landed.

0:02 It's available kind of across the entire Microsoft ecosystem and we're going

0:05 to give it a spin today inside of GitHub Copilot and VS Code.

0:08 We're going to build out an entire application and sort of my standard

0:11 task and see how it performs not only in the code that it generates,

0:14 how it thinks about it and how it designs it.

0:17 There seems to be a new model every day.

0:18 So why does GPT5.2 matter?

0:20 Well, it's really fast which I appreciate of course.

0:22 It is really good at heavy reasoning and longer context windows

0:27 and it provides really accurate outputs which I obviously really appreciate.

0:31 So when I'm coding it's really good with high performance on large code bases,

0:35 has that long context handling, stronger reasoning and multi-step planning too

0:39 which I really really appreciate it.

0:41 So let's go ahead and dive into VS Code and we're going

0:43 to build out this sort of application that we do pet venue sharing for.

0:48 I've used it in a bunch of my videos and let's give it a spin.

1:01 All right, let's get into it.

1:02 So you should see GPT5.2 in your model selector.

1:06 It's in preview so if you are on business

1:07 or enterprise make sure you go enable that on github.com.

1:10 So I'm going to ask it based on this idea for this sort of pet venue application

1:15 to create a product requirements document but I

1:17 also want it to keep it pretty high level,

1:19 don't go into the weeds too much and then create it in markdown.

1:23 So I've attached the file here and this is the same idea that I give

1:26 every single model just so I can understand and see the PRD that it creates.

1:30 So I've really appreciated the GPT models specifically

1:34 for being able to break down these types of tasks,

1:36 these big PRD files where it's parsing a bunch of text,

1:39 it's understanding the requirements for it and then putting it all together.

1:42 So it's doing a bunch of thinking here.

1:43 It's making sure they don't have a PRD

1:45 or looking for other PRDs which I do appreciate.

1:47 Maybe there was a PRD that was already in there

1:49 and now it's as you can see drafting a high-level PRD.

1:53 So we're seeing this sort of research and thinking that's going on here

1:57 and we actually did see some of that thinking happening in real time.

2:00 Okay, so it created our PRD and everything is

2:01 happening in real time here and gives us an overview.

2:04 So let's take a look.

2:05 Summary, goals, love a good non-goals that's also very important.

2:11 The target audience, the key problems, core value proposition.

2:14 You can do this kind of for anything as well by the way if

2:17 you're not doing like PRDs or spectrum

2:19 of development definitely give that a look.

2:21 Okay, I'm going to take this PRD and I have a standard prompt

2:23 that I've been using for all

2:24 of these different models and these different iterations.

2:27 I just like to see the output and standardizing

2:30 as best as I can is the way to do it.

2:32 So I'm really looking for a landing page

2:34 first in this prompt that's desktop and mobile specific,

2:37 light dark modes, I want pink hues, nice fonts, emojis,

2:42 hover animations and I'm just telling it

2:44 here in this Blazer WebAssembly app that I've

2:47 given it some photos and pets and venues and to update the existing home.razor.

2:52 So it's going to go to work here.

2:53 It's creating a bunch of to-dos and it's using

2:54 a bunch of sub-agents to read a bunch of different files.

2:57 So I do like that.

2:59 So five tasks that it's going to complete and yeah,

3:02 we're seeing some thinking happening here.

3:03 So it's defining browse venues, it's understanding the page venue,

3:07 it's considering if should include an add a venue option in here.

3:11 I did tell it only a landing page so hopefully it does.

3:14 We'll see.

3:14 At least hopefully it should The PRD does describe the pages that are on it.

3:19 It's breaking down the inner up that it's going to need here and then

3:22 I did tell it to run I think somewhere in this file perhaps.

3:26 It's telling it to run after it builds but it

3:28 anyways it figured out that it does need to build it.

3:30 So it's managing the to-do items and we can see I think it's thinking.

3:34 This is one thing that I've noticed with the GPT 5.2 models is

3:37 sometimes with the GPT models they do like to kind of stop and then

3:41 you got to give it a little nudge to keep going

3:43 but in this case we can see on the bottom right that it is running.

3:45 So it's doing its thing and we can even see the Copilot little spinner there.

3:48 But yeah, it just created and updated the home.razor and now

3:51 it's going to add a bunch of CSS I think

3:53 and we can see now we have the thinking going on here

3:55 and it's starting this next task of the order of operation.

3:59 So I did mention this is pretty quick.

4:01 I think in this run that I did it's maybe like 10

4:05 to 12 minutes total if I remember here and it's pretty on par.

4:09 I have enjoyed the speed of the GPT models in general and specifically

4:15 more recently the Codex models that I've

4:17 been using have been really really fast.

4:19 Okay, so it's it's thinking, it's doing things and again this is real time.

4:23 Not going to edit anything down there.

4:24 But yeah, huge CSS file so 600 lines of CSS.

4:28 Appreciate you.

4:29 And now it's creating new files.

4:31 I do appreciate that it's creating the files and all

4:32 the code is there so that's also very nifty too.

4:35 All right, then it's going to do a build and run so let's

4:37 see if it was successful or not and see if it one-shotted it.

4:40 I appreciate a one-shot so it's now running in the terminal and this is

4:43 now just .NET running and building on my little MacBook Air here.

4:47 So let's take a look at some of the code that it generated.

4:50 Interesting I put the navigation inside the home page.

4:53 You know, there is only one page.

4:54 I told it to make a landing page.

4:57 Um, but here yeah, it's added a bunch of links

4:58 into our HTML so that looks pretty good there too.

5:02 All right, so it's looking like it's also running .NET test.

5:05 All right, I appreciate you for for testing testing.

5:07 I don't even know if I have any tests but sure,

5:09 I guess it ran and then hopefully it should be done

5:12 and then we should be able to launch it here as well.

5:15 So inside this this folder by the way if you are super curious here is

5:18 that it just has a blank file new

5:22 Blazer WebAssembly applications I can just run here.

5:25 So I don't know what it's actually thinking about so this maybe are

5:28 some improvements to the prompting that will need to have happen down the road.

5:33 But so far we're in about 4 minutes.

5:36 All right, so it completed it and it gives us our outputs.

5:38 Maybe it was summarizing.

5:40 All right, everything looks good and I do appreciate this is no test

5:43 executed in this repo cuz I have a blank test file so that's great.

5:46 All right, let's run this puppy and see what happens.

5:48 So now again we're just kind of building it.

5:51 Could have asked me to to run it which would have maybe

5:54 been appreciative of but hopefully we get something that looks pretty nice.

5:57 All right, let's see what we got here.

5:59 All right, wow this looks actually really stunning.

6:01 I love the pink gradients.

6:02 I love this.

6:04 I don't know what's happening over on the right

6:05 hand side but I do love the little cards, animations, dark mode, fire, love it.

6:09 Little getting started button there, nice cards, lots of emojis.

6:13 I do appreciate it and I like that it

6:15 incorporated images from both pets and venues across.

6:18 Little Q&A, I like that.

6:20 That's nice.

6:21 But just about the MVP we put together.

6:23 Browse venues, contribute.

6:24 Oh no, nice little footer as well.

6:26 This may be one of the better footers that I've seen in a long time.

6:28 I also it's maybe hard to see but you're actually seeing on that navigation

6:33 bar a bunch of translucent kind of like see-through there which is really cool.

6:39 I also like that it put little anchors there.

6:40 That's very nice.

6:41 Okay, let's have it do a more complex task.

6:44 So what I want it to do now at this point

6:46 is to add a venue page and ideally also venue details.

6:52 So the reason that this is important when

6:53 we think of this reasoning is that I want

6:56 it to understand how to fan out the rest

7:01 of the application as I would as a developer.

7:04 So it could just mock out all the venue

7:07 things but I also want to create mock data.

7:09 So ideally what I want it to do is start to create some interfaces,

7:13 understand um how to structure the data,

7:17 use modern C#, ideally add the new pages in the right place,

7:22 use proper navigation on it.

7:25 I didn't ask it to write tests but ideally it would maybe do that.

7:28 So here it's going to go through

7:29 some thinking again it's using sub-agents to read

7:31 a bunch of files and it looks like it's planning it out in general.

7:35 So this is looking pretty good so far.

7:37 So I have pet images, that's good.

7:40 Okay, cool.

7:40 So we're going to have small venue model, mock data service,

7:44 DI, create venues, venues with an ID and wire it all together.

7:49 I love it and I love it's just creating all

7:50 these pages pop pop pop pop pop pop pop pop.

7:52 So that's really nice that it's going through and creating

7:55 all of those pages here and when it creates

7:58 those pages I am 99% sure that it is also

8:00 just creating all the the code that's in it as well.

8:04 And these should be smaller files.

8:06 We can see the files changed are 59 lines of code

8:08 so these are just data models so no pages yet.

8:12 But it's looking pretty good in general.

8:14 I like that we have an I venue service,

8:16 venue rules, venue review, venue amenity.

8:18 I thought about the venue itself and what

8:21 this mock data service was going to be.

8:23 There we go.

8:24 So here's that mock service.

8:25 It's really big.

8:26 Venue's page and then ideally we get the venue's

8:30 details as well cuz I did ask it.

8:32 So let's see if it goes ahead and figures that out for us.

8:35 That would be ideal.

8:36 But here this is actually working a lot

8:37 faster on a larger problem across many files.

8:41 So it looks like it's in place.

8:42 They're going to register the DI.

8:44 Very cool.

8:45 That's looking good there.

8:46 And then let's see if it builds up.

8:49 So let's go ahead and zoom out and see all the files I've been created here.

8:51 So it's editing the home,

8:52 the program.cs and hopefully we get something here as well.

8:55 Again, no edits this video, no speeding up or anything like that.

9:00 You know, I usually try to do this in under 10-ish

9:02 minutes to kind of give it a real a good to go.

9:05 We can see that it's still thinking cuz we can see that the stop button's there.

9:08 So maybe it's doing a summary of the changes that it did.

9:11 Maybe there's a little improvement there that the team can land

9:14 on in some of the iteration on these models and what you'll see is

9:18 if you run this model again probably in a week or two

9:21 you'll see that the results are going to be a little bit different.

9:24 And also the interactions are going to be a little bit different too.

9:27 Okay, so it looks like we have a build error.

9:29 So that's fascinating.

9:30 I'll see if it's going to self-heal or not.

9:32 So it says resolving package issue.

9:34 It looks like it's using some code that needs a package there.

9:38 But it does look like that it hit this problem.

9:40 It identified the problem however it kind of stopped right there.

9:43 So this is probably in time in which I'm going to need to bump it I guess.

9:47 So let's go ahead and just tell it to try to build and run again.

9:51 So funnily enough when I was doing this and actually read the output that it

9:55 figured out what it needed to do but because I'm in the same context here,

9:59 I think it's going to go ahead and do it.

10:01 So, here it's considering what it should do and yeah,

10:03 once I add a new get package,

10:05 the I almost skipped, which is funny, but I guess I got to trust it.

10:10 Uh but yeah, the mock venue services looking good over here.

10:13 Uh let's see if it builds up and compiles for us.

10:16 It's a little bit of a bummer that it didn't automatically add that for us.

10:20 It should have for sure.

10:21 That is for sure.

10:22 But now it's going to run the task.

10:23 I do have a a task, so it's cool that it identified that.

10:26 I would have liked for it to do it in the first run there, but here it is.

10:29 Okay, cool.

10:30 All right, so it's looking good.

10:32 That little outline that you see is a little

10:33 accessibility feature that I have on on my Mac OS.

10:36 Um so that's not part of the website just there.

10:38 But oh, this looks beautiful.

10:40 Little grid going on here.

10:41 We have um um some filtering and sorting going on.

10:46 Beautiful.

10:46 So, I type in Seattle or or uh Portland or in here.

10:50 That's really cool.

10:51 I can filter on these different uh little things.

10:53 It has a little clear button.

10:54 Nice little details, little reviews going on here.

10:57 Lovely.

10:58 I love it.

10:59 That looks really really nice.

11:00 Uh it looks like it's still running cuz I saw the hot reload go,

11:02 so I don't know if it's doing stuff.

11:04 Um I am noticing though that it doesn't seem to have the top navigation,

11:08 so that does seem to be a bummer.

11:10 So, let's go ahead and tell it uh

11:12 to make sure that we have the top navigation, right?

11:15 So, that would kind of be important across the board.

11:17 And we noticed earlier, I kind of went through the code of the the home.razor,

11:21 but I noticed that the navigation was in there.

11:23 So, it didn't break it out um there.

11:25 It does look like it's still thinking.

11:27 My assumption is that it is just finalizing any output,

11:30 but that that was working just fine.

11:31 So, there we go.

11:31 Okay, cool.

11:32 Perfect.

11:33 All right, let's go ahead and tell it to do the thing.

11:36 Or let's actually Okay, yeah, it's still not not there.

11:38 Okay, cool.

11:39 All right, just was verifying it didn't magically do something.

11:42 So, let's go ahead and let it let it let it rip here as well.

11:45 So, again, it has the entire context of this chat, which is really nice.

11:48 And now it's going to revamp, it looks like the layout.

11:51 Uh that sounds good to me.

11:52 I like it.

11:53 All right, cool.

11:54 It's figuring it all out and using navigation manager.

11:56 Perfect.

11:57 I like that.

11:58 Before it was just using links, I just HTML links, I believe, so.

12:02 We should see this as well.

12:04 So, let's go ahead and stop the the output

12:06 and we'll have to rebuild and let it go.

12:08 Uh though maybe with hot reload.

12:10 Not going to risk it.

12:11 All right, so so far we have about uh 1,200

12:14 lines of code change in just this uh build here.

12:18 Um almost 1,300 at this point.

12:20 Um so, let's take a look at the output here.

12:22 Not sure what the C# extension's doing.

12:25 upset for some reason, but yeah, looks like Okay,

12:27 now navigation includes home, venues, quick links.

12:30 So, let's go ahead and run the application one more time.

12:33 Just going to open up the uh program.cs and just run it from there.

12:37 That's kind of how I how I do it.

12:39 Let's keep everything.

12:40 That looks beautiful.

12:41 And let's just make sure it builds and it runs.

12:45 Okay.

12:46 Here we go.

12:47 Fingers crossed that we get a nice navigation.

12:49 Venues.

12:49 All right, there we go.

12:50 That's much better.

12:51 And I love the the light.

12:53 Now we can see the dark theme everywhere cuz there's that toggle.

12:55 We can see that nice subtle um opacity that it put in there,

13:00 which is really nice.

13:01 And it really nailed this this look and feel and the subtle gradients.

13:05 Purple gradients, of course, you know, it's AI uh in there,

13:08 but I did tell it pink gradient,

13:10 so that's on me for telling it pink, but I really like the dark mode.

13:12 I think these uh toggles look really really nice.

13:15 So, I would like to investigate the code a little bit and take a look at it.

13:18 Code's important, so let's take a look at what we have here.

13:21 So, if we go directly into our service that we have, we have an interface.

13:26 That's nice cuz we're going to have not a mock value at some point.

13:29 Our model's using sealed records.

13:30 Interesting.

13:31 All right, I like that it's using records.

13:32 That's cool.

13:33 Some nice enums.

13:34 I like that it broke it out into individual files.

13:36 I didn't tell it to do that.

13:37 And then we have our main layout and then our details as well here in a razor.

13:41 So, it's looking really good.

13:42 I I think that this is very impressive work from GPT-5.2.

13:50 All right, there we go.

13:51 I am very very pleased with the results of GPT-5.2.

13:56 Now, this was a very blank application that I had

13:58 to build out and I had to do some reasoning over.

14:00 And even when I asked it to refactor,

14:02 it was able to really nail that refactoring.

14:04 I think the thing that is really a highlight

14:07 of the results here is when I added those venues and venue

14:10 details and the amount of effort and work and planning

14:13 that it put into not just the models using modern C# syntax,

14:18 but also how it broke down the different components and pages

14:20 and updated all the CSS and JavaScript along the way.

14:24 All right, have you given GPT-5.2 a try?

14:27 Let me know in the comments below what type of results you're seeing.

14:30 And if you use other models, too.

14:32 I've been really exploring some of the Codex and the Codex

14:34 Max as well and playing around with some of the other models.

14:37 So, hope that you've really explore these models.

14:41 I definitely try them.

14:42 I love now spinning up a different background agents as well in VS Code

14:46 and letting it rip with different agents

14:48 and work trees and seeing how it performs.

14:50 So, let me know how it's been going in the comments below.

14:53 Until next one, happy coding.

14:58 [music] [music]