GPT 5.6 vs Fable 5: Who Wins?

GPT 5.6 versus Fable 5 who wins? Today we're going to be testing them out side by side and showing you exactly who wins. So OpenAI's new flagship model is GPT 5.6 Sol and we're going to be comparing that against Claude Fable 5 and seeing how it performs side by side. So these are two new frontier models, very different actually.

So basically GPT 5.6 Sol is OpenAI's flagship model, top tier, and then you've got Claude Fable 5 which is Anthropic's newest model as well. And if you're wondering okay how do they perform on benchmarks here, the output price is a lot cheaper on Sol and if you're wondering how do they perform on benchmarks, let's run through it game by game. So we've tested them out side by side, I'll run through the results in a second. So this is Sol versus Fable 5, let's open them both up.

Sol's output here looks really good, really smooth game, kind of like an open world dragon game as you can see here and actually works. Doesn't feel laggy or buggy at all really, I mean the graphics could be better but overall pretty nice considering this is one of the nicest generations I've made for this specific test. Now let's compare that to Claude Fable 5 which is a bit brighter but not quite as interesting when you're roaming around. So if we have a look for example there's less characters, there's less stuff going on, not quite as interesting, not really as entertaining as a game and so I would actually say that on that particular round GPT 5.6 Sol has won.

Then we have Dragon Realm and we have the Doom game next right. So if we compare these side by side this is Sol, looks super nice, really smooth to use, easy to control, easy to navigate, quite fun to play as a game. A little bit easy but you know you can level off and that sort of thing but overall pretty much perfect. It doesn't feel buggy in any way, again smooth, easy, looks visually nice.

Now let's compare that to for example Fable 5. So Fable 5's output here, quite nice to use, the graphics don't look quite as good, there's not as much going on again as well so I can't see any characters. There's a couple here, here we go, quite nice to use. I would say they're pretty much on par but I'd say the graphics are slightly better using Sol.

Next one, so this is a racing game, 3D racer game and so far I would say that it's very close on the Doom game but Sol just beats Fable 5 and then for the Dragon Realm game Sol won by a long way. So far Sol has won two out of five tests. Let's have a look at the next one. So this is a 3D racer from Sol, looks super nice, quite fun to play as well and the graphics on this one don't look quite as good.

It is fun to play, moves super fast but I would say that it's very very close right there. The graphics are worse on Fable 5, Sol did a better job on that but at the same time the gameplay was way more fun with Fable 5. So I would say that's very very close, maybe Sol just edges because it has created nicer graphics. Next up we have the Crypt game, again Sol has done a great job on all these, especially this one, fun to play, easy to use, nice graphics, nice colours, smooth, everything else.

Now if we have a look at the Fable 5 generation, it's good, like I mean it is pretty good, it's a bit harder to navigate, the staff doesn't move as well when you use it, it's a little bit buggy in places too, it feels very linear as well, that's the other thing that I would say here. Next up we have a Skyrim style game. So let's have a look at this one, it's called Frostfell. Now this one is quite hard to control, weirdly enough.

So I'm trying to go straight forward but it's walking sideways, which doesn't make much sense. And then you can see the dog is like kind of moonwalking over there as well, which is weird. So the gameplay looks nice but when you actually try and play it it's very hard to navigate and yet you kind of have to switch the keyboard around, like the keyboard changes. If we have a look at Fable 5, this is smoother, it's nicer, looks pretty cool.

Let's try and go over there, yeah it's looking way nicer here. So I'd say the Fable 5 won that one, I mean all of these are super super close, like marginally close honestly. And this is the output from Sol, doesn't seem to work when we're using, oh it's okay actually. How do we change the camera angle?

Oh we can change it like that, yeah okay. Yeah it's looking good, looks nice. And then this is the output from Fable 5, which I would say is a lot smoother, more interesting game, like if you look around it looks visually more appealing, more fun etc. Yeah it looks really cool, super nice.

So Fable 5 won that by a long way. I would say, I mean honestly that is pretty much a draw, like across the board, very similar. If I had to pick one for coding projects, for me I think my brain is trained to be, like for example, I think number one I wouldn't use both Inside Codex and Cloud. I think if you're working on two, one project at the same time, across two different apps, you're going to have situations where you overwrite the code, or you delete stuff accidentally and that sort of thing.

So if I had to pick one, I'm still going to stick to Cloud Desktop. I think it's easier for me to get my head around and build multiple things. So for example we're building out all these GPT 5.6 features inside the AgentOS using Cloud, and I think that's a much smoother way to do it. What I do think is probably the best way to get the most out of all this, is you have an AgentOS system where you can have everything inside one place.

So for example like you see right here, and then we can have, for example, Goalmode working autonomously on one project. So this is like a game and a website we created with Goalmode, just running the background autonomously with AgentOS, and that was using Codex. But then what we can also do is, whilst we're doing that, we can have Hermes with Codex implemented over here, and we can have Claude ready to go inside here, and we could be using, for example, our UltraCode in the background. And so I think the best way to get the most out of them is to have them combined side by side.

If I had to pick one, I would go to Cloud Fable 5 just because I prefer Cloud Desktop, and either way you can plug both of them into your agent operating system. The other thing I would say here is that when you're using, for example, agents like Hermes, you can't use Cloud OAuth, so you have to pay for the API. Whereas, for example, if you're using GPT-5.6, you can easily use OAuth to generate images, to go back and forth with Hermes, and use agentic models for free of your existing subscription. So that's a better way to use Hermes.

So it depends what you're really using it for. But if I had to pick one, Fable 5. Difficult, very difficult to answer. Actually, if you see the differences here, Sol was quite good at the action and precision.

Fable 5 was better at the atmosphere and making things feel like a bit more detailed and interesting. Let's have a look at some more builds here. So if we go to GoldieBench, we can compare the models side by side. So if you filter by GPT-5.6 Sol, we can see Fable 5 side by side here.

But again, like how similar do they look? They're very, very similar in terms of the output. So let's check the flight simulator. This would be a fun one.

By the way, I tested this out with HY3 the other day, Tencent HY3, and it didn't achieve anywhere near this sort of level. So, I mean, these two models are just in a class of their own. I wouldn't say GLM 5.2 gets close either, to be honest. So it's creating awesome stuff.

Really, really nice to use. This is the output from Sol. And then let's compare this to Fable 5. I mean, Fable 5's output here, it feels, again, a lot smoother, a lot more detailed, which is what we were talking about before, which is, you know, Fable 5 is great at the details, it's great at the atmosphere and everything else.

And then GPT-5.6 is good at like making the gameplay smooth and everything. Let's try this one. So this is Neon City. I mean, how cool does that look?

And then this is Fable 5, which is, it's pretty cool in a different way. They've both got a totally different vibe when they code stuff out. Be interested to see as well, how do they perform on the video creation? So we actually gave ReMotion, which is a skill for creating videos into both.

This is the output from GPT-5.6. It looks super nice. Like, look how clean and nice the UI is. It's smooth, it's got a nice progress bar at the bottom.

And basically, this coded out a full page, as you can see, and it looks fantastic. Design and the UI is really, really nice. If we compare that to Fable 5, let's open it up. Yeah, this one looks nicer.

Like, it just feels smoother. It's more interesting. It's more entertaining. It's more animated.

Everything is better. So yeah, both fantastic models. Glad we have both, you know, access to both. I think GPT-5.6 is scoring higher on the leaderboards.

But again, if I had the choice, it's not just about the model itself, but often it's about the harness and where you store it, right? So for example, using Claude Desktop is so nice and smooth as an experience, whereas Codex, it just doesn't feel quite as nice. It's not quite as fun to use. The other thing I would say is, like, the sites option is quite interesting as well.

So this is a new feature inside Codex where you can build websites. But yeah, that's it. Now, if you want to get both models running side by side, you can get that inside the AgentOS. So we have a section for Claude where you can use UltraCode, you've got RPAX, everything you build, the workspace, the chat, and then we also have Codex over here.

The other interesting thing is, you know, if you're using GPT-5.6 quite a lot with OAuth, you might run out of tokens. Now, if you run out of tokens, you can actually switch to Omni or HY3, which is free as an API, inside Codex using our AgentOS system. We have goal mode running autonomously over here. We have the workspace over here as well, where you can see and preview everything that you've built with this stuff.

And then we have the memory system that links them all together. I would say if you want to get the most out of Fable 5 and Claude and Codex, plug them all into one powerful system like this. You get way more out of it. It's way more fun to use.

And also you can build and improve and customize this exactly how you want it day-to-day, which I think is the best way to get the most out of these models. So if you want to get that, it's inside the AI Profit Boardroom. Link in the comments description or go to theaiprofitboard.com. Inside the community, you can ask questions, get help and support in real time.

I answer these questions daily with a new video tutorial inside the classroom. You get access to all of our best training. So for example, we have a full six-week beginner to expert masterclass over here, and we have new daily tutorials over here that we update with new advanced stuff, as you can see. Inside the AgentOS section here, you can get the new updates, the video tutorial, the zip file to install it, and we add new daily updates, as you can see.

And then you can also get four weekly coaching calls where you get help and support in real time, share your screen, meet other members. And inside the map, you can meet other people using Codex, Fable 5, and also building agent operating systems as well. So hope to see you inside there. Cheers for watching.