GPT-5.6 is INSANE!

**Julian Goldie** (0:00)
Today, we have three new models from GPT 5.6 Massive Step Up. I can tell you now, I'll show you some of the tests that we've gone into, but we have a full solar system of new models directly with GPT 5.6. If you don't have access to it right now, by the way, it is rolling out slowly. So some people around the world are getting it sort of step by step, if that makes sense. Now, OpenAI's new GPT 5.6 has three new layers, Sol, Terra and Luna. Luna is a fast, cheap one. Terra is the everyday model. Sol is the beast. If you want to see what Sol can achieve, let me show you some of the latest creations from GPT 5.6 that we've tested on Goldie 2 on the leaderboard. So let me show you some of the stuff it's created. It looks really, really cool.
We've tested out relentlessly, already built out 33 different projects with it, and you can see these on Goldie Bench. So let's check them out. For example, we have this game and it's looking really, really good. You might say, is it Fable 5 level? I would say at this point, it's on par. Like it's really, really good. It can create some amazing stuff. I have a little feeling that if I was to choose one model and only one model that I could use forever, it would definitely be Fable 5 over Cheapity 5.6. But Sol is awesome, as you can see, and create some amazing stuff. Let's have a look at another one. So this is like an open world game, as you can see right here. It feels really nice to use. I was testing out Grock 4.5 and that impressed me yesterday, but this is way, way better. It's just more fun. The gameplay is sharper. It feels just a lot nicer visually. It's a lot smoother and a lot more interesting in these open worlds as well. So it looks fantastic, as you can see. Let's have a look at another one. It's like a Doom style game, as you can see. One of the things I'll say here is quite often, models struggle to really build out a smooth game like this, and this has worked perfectly and it just feels really nice to play.
It feels smooth when I'm looking at the creations it's made. It's like a racer game as well. So Sol is the absolute beast. In fact, I probably wouldn't use any of a model apart from Sol if I had the choice. I think that's what I'll try and stick to for now. But if you're wondering about the other two models, I'll come on to those in a second. But just to show you, the creations here are absolutely unbelievable. Here's a full video that it created. So it created a full video animation here. It looks super nice.
This is, you can see here, for example, as a progress bar at the bottom, it's created all of this. Like I haven't touched it. I didn't create any of this. It just from one single prompt does a test and it looks fantastic as you can see right here. So this is fully, like a video fully created with GPT 5.6 Sol. So you can create videos, you can create games, you can create landing pages, you can create awesome stuff as you can see right here. And yeah, unbelievable. All of it was really, really good. There was nothing I looked at where I was like, ah, not sure about that. Like all of it that I checked out was just fantastic. And it's a really, really good model, which is the first time that I've said that about GPT this year, apart from the image model, the image model was go to as well, to be fair. So let's run through it. What is GPT 5.6?
How does it work, et cetera?
So this just dropped today, OpenAI made GPT 5.6 generally available, not as one model, but it's free. So same architecture, three sizes, all three share one million context window, 128K max output and February 2026 knowledge cut off.
You can see the prices here. So for example, of course, like Sol was a lot more expensive to use than Luna, which is a lot cheaper. One thing to bear in mind here is when you're using it, like you can just use it with a auth. So that means you don't have to use it with an API. So for example, if I was using my agent OS and I'm using Codex inside here with GPT 5.6, so we can switch between the models. I can use a free model as well. I only root inside Codex if I want to. But if we went to the workspace here, what you can see is that we can flick through between everything that we've built is inside one place. And this was all created with a auth. Like I didn't pay for the API to build this stuff, which is absolutely awesome. And it's the same, for example, inside Hermes, we can use GPT 5.6 as a separate profile. And the great thing about that is it doesn't cost us any extra. Whereas for example, for you using Fable 5 or any form of Claude inside Hermes agent or any sort of agent like OpenClaude, you'd have to pay. So there's a big difference between these. So how would you use these? Well, if you look at the position here, Sol is more for flagship, hard multi-step agentic work. Terra is the everyday production model. And then Luna is like high volume, latency sensitive work. So Sun for Moon, biggest to smallest. And this was actually delayed. So there was a government review first. It dropped in preview about a week or two ago. And then from there, they've finally released it to the public, which is fantastic. So you can see here, if we look at the benchmarks on intelligence index, Fable 5 is still outperforming Sol by one point. So 60 versus 59 versus 55 versus 51 This is from the artificial analysis index.