On this page
Getting StartedExample 1: Basic Text GenerationExample 2: Complex ReasoningExample 3: Comparing ModelsList of Supported DeepSeek ModelsDeepSeek Free API KeyConclusionRelated
Tutorials

Free, Unlimited DeepSeek API

Nariman Jelveh, Reynaldi Chernando
On this page
Getting StartedExample 1: Basic Text GenerationExample 2: Complex ReasoningExample 3: Comparing ModelsList of Supported DeepSeek ModelsDeepSeek Free API KeyConclusionRelated

This tutorial will show you how to use Puter.js to access DeepSeek's powerful language models for free, without setting up an AI server or using any API keys. Using Puter.js, you can leverage models such as DeepSeek v4 Flash, DeepSeek v4 Pro, DeepSeek v3.2, DeepSeek R1 0528, and more for various tasks like text generation, analysis, and complex reasoning.

Puter.js uses the User-Pays model, where users of your application cover their own AI costs. This means you as a developer don't pay anything for your users' usage, making your app practically free to run. You can scale to unlimited users and pay nothing for their AI usage.

Puter.js is also remarkably well-suited for the new wave of AI coding assistants, agents, and vibe coding platforms (think Claude Code, Codex, OpenCode, Lovable, Replit, and friends). Since it ships with no keys and no server to operate, any app or program these tools create using puter.js simply works from end to end. There's nothing to sign up for, nothing to provision, and no API keys to drop in. That sidesteps a whole class of common security mistakes and removes the setup tax that normally keeps AI-generated apps from running on the first try.

Getting Started

To use Puter.js, import our NPM library in your project:

// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';

Or alternatively, add our script via CDN if you are working directly with HTML, simply add it to the <head> or <body> section of your code:

<script src="https://js.puter.com/v2/"></script>

You're now ready to use Puter.js for free access to DeepSeek capabilities.

Example 1: Basic Text Generation

DeepSeek v4 Flash is suitable for everyday use with its balanced reasoning and efficient output.

<html>
<body>
    <script src="https://js.puter.com/v2/"></script>
    <script>
        puter.ai.chat("Explain quantum entanglement in simple terms", {
            model: 'deepseek/deepseek-v4-flash'
        }).then(response => {
            puter.print(response.message.content);
        });
    </script>
</body>
</html>

Example 2: Complex Reasoning

DeepSeek v4 Pro excels at complex problem solving, thanks to its long thinking and maximum reasoning effort.

<html>
<body>
    <script src="https://js.puter.com/v2/"></script>
    <script>
        puter.ai.chat("What would be the environmental impact of replacing all cars with electric vehicles? Consider both positive and negative effects.", {
            model: 'deepseek/deepseek-v4-pro'
        }).then(response => {
            puter.print(response.message.content);
        });
    </script>
</body>
</html>

Example 3: Comparing Models

Here's how to compare responses from different DeepSeek models:

<html>
<body>
    <script src="https://js.puter.com/v2/"></script>
    <script>
    (async () => {
        const chat_resp = await puter.ai.chat(
            'Solve this puzzle: If you have 9 coins and one is counterfeit (lighter), how can you identify it with just 2 weighings on a balance scale?',
            {model: 'deepseek/deepseek-v4-flash', stream: true}
        );
        document.write('<h2>DeepSeek v4 Flash:</h2>');
        for await (const part of chat_resp) {
            if (part?.reasoning) puter.print(part?.reasoning);
            else puter.print(part?.text);
        }

        const reasoner_resp = await puter.ai.chat(
            'Solve this puzzle: If you have 9 coins and one is counterfeit (lighter), how can you identify it with just 2 weighings on a balance scale?',
            {model: 'deepseek/deepseek-v4-pro', stream: true}
        );
        document.write('<h2>DeepSeek v4 Pro Solution:</h2>');
        for await (const part of reasoner_resp) {
            if (part?.reasoning) puter.print(part?.reasoning);
            else puter.print(part?.text);
        }
    })();
    </script>
</body>
</html>

List of Supported DeepSeek Models

The following DeepSeek models are supported by Puter.js:

deepseek/deepseek-chat-v3-0324
deepseek/deepseek-chat-v3.1
deepseek/deepseek-r1-0528
deepseek/deepseek-r1-distill-qwen-32b
deepseek/deepseek-v3.1-terminus
deepseek/deepseek-v3.1-terminus:exacto
deepseek/deepseek-v3.2
deepseek/deepseek-v3.2-exp
deepseek/deepseek-v3.2-speciale
deepseek/deepseek-v4-flash
deepseek/deepseek-v4-pro

DeepSeek Free API Key

DeepSeek's official API does offer a one-time signup bonus of 5 million free tokens, valid for 30 days. That's enough to get an API key and try things out for free, but once those tokens are gone (or the 30 days are up), you're back to the standard developer-pays model where every request your users make comes out of your account. With Puter.js, you don't have to deal with any of that — there's no API key to manage, no bonus to burn through, and each user covers their own usage through their Puter account.

Conclusion

Using Puter.js, you can gain access to DeepSeek's powerful language models without having to set up the AI server yourself. And thanks to the User-Pays model, your users cover their own AI usage, not you as the developer. This means you can build powerful applications without worrying about AI usage costs.

You can find all AI features supported by Puter.js in the documentation.

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