How to use DeepSeek V4.1 Flash API for FREE!

Julian Goldie (0:00)

So, DeepSeek V41 Flash just dropped, and you can use it for free. Not only that, but you can use it via the API for free. So, I'm going to show you exactly how to do that. So, what you can do is sign up to something called TokenHarbor.AI, and once you've done that, you can then create an API key once you've logged in. So, you sign in, create a free account, and from here, click on Create Key, like so, inside your settings, click on New, give it a label. So, for example, call this AgentOS, just as a test, create it like so, and we have that, as you can see. So, we're just going to grab that, and now we have the API key. Once we've done that, we can now go over to, for example, if you want to set this up, you can use this however you want, but what I'm going to do is get Astra to set it up via the API inside our AgentOS, right? So, what we can do from here, and you'll see this inside the models. If you go to Models and then Free, you'll see that you have DeepSeek V41 Flash with the Million Token Context window. And so, you can also use DeepSeek V4 Flash for this and MIMO. Bear in mind, like, it can be limited if it's a free API key, but you can still use it. And then, what we can do over here is we can go into our AgentOS. And I've already got DeepSeek Harness set up inside our AgentOS system. So, what I'm going to do from here is I'm going to say, okay, can you set up DeepSeek V41 Flash with Token Harbor? See the API key here. Make sure it's working inside DeepSeek Harness on the AgentOS as a drop-down, and test it actually works. And then, what I'm also going to do is just get the documentation from Token Harbor here, so I can train the AI on exactly how to use it. So, we'll go back to ChatGPT, and I'll say, documentation below. So, that is beginning to add Token Harbor as a separate provider in the DeepSeek Harness drop-down, and we'll use it with DeepSeek V41 Flash. So, that's how you can get the API for free.

And if you want to see an example of, like, what DeepSeek V41 Flash can actually do, let me show you some examples here. So, it's actually pretty good. Let me show you an example. So, if we open up this game, this is something we created earlier using DeepSeek V4 Flash, and it's kind of like a cool game. But the thing that blew me away was, like, number one, the speed of how quickly it works. Number two, that you can actually use this for free.

And number four, the, it looks really good, right? So, you can go for free, it's fast, and it looks really good. I mean, this is right up there with Frontier Models. And I've seen Frontier Models produce worse outputs than this for games like this. So, it's pretty nice and smooth. You can also, for example, use it for web design. You can use it for creating apps and that sort of thing. So, here's another example. And this whole page was generated as well using DeepSeek V41 Flash. Now, you also might wonder, okay, how does it perform on benchmarks?

So, you can see an example here. DeepSeek V41 Flash is right up there with GPT 5.6 Sol, which scored 94.1 on GPQA Diamond and 93.4 for Claude Oberst 5

So, DeepSeek V41 Flash is number one, free as an API. Number two, very fast. Number three, like it's right up there with frontier models, which is unbelievable when you think about it. Bear in mind, this is just getting better and better and faster and faster.

And DeepSeek Harness itself is really, really good and great for coding. So, if we scroll down to our Agent OS over here, and then we go to DeepSeek, we'll DeepSeek Coder. Then we can go to the Harness, and you can see that we have token harbor with DeepSeek V41 Flash 3, using the API key that we talked about earlier. So, we can select that and then we can start coding with it directly. So, if we start a new session here, switch over to standard, and that's the other cool thing about DeepSeek Harness, is that you can use it with standard mode, code mode, minimal mode, or creative mode, and then you can choose however you want to do it. So, let's just, for example, build out a random website. Can you build out a landing page for an SEO strategy session for an SEO agency called Goldie Agency?