DeepSeek Reasoner API

Access DeepSeek Reasoner from DeepSeek using Puter.js AI API.

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Model Card

DeepSeek Reasoner is the API alias for DeepSeek's reasoning models (R1 series), which use chain-of-thought reasoning to solve complex math, coding, and logic problems. It displays its thinking process before arriving at answers and achieves performance comparable to OpenAI o1.

Context Window 128K

tokens

Max Output 64K

tokens

Input Cost $0.56

per million tokens

Output Cost $1.68

per million tokens

Input text

modalities

Tool Use Yes

 

Knowledge Cutoff Jul 2024

 

Release Date Jan 20, 2025

 

API Usage Example

Add DeepSeek Reasoner to your app with just a few lines of code.
No API keys, no backend, no configuration required.

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

puter.ai.chat("Explain quantum computing in simple terms", {
    model: "deepseek/deepseek-reasoner"
}).then(response => {
    document.body.innerHTML = response.message.content;
});

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

View full documentation →

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Frequently Asked Questions

What is this DeepSeek Reasoner API about?

The DeepSeek Reasoner API gives you access to DeepSeek's chat model through Puter.js. With just a few lines of JavaScript, you can integrate DeepSeek Reasoner into any web app or Node.js project — no API keys, no backend, and no configuration required.

Who created DeepSeek Reasoner?

DeepSeek Reasoner was created by DeepSeek and released on Jan 20, 2025.

What is the context window of DeepSeek Reasoner?

DeepSeek Reasoner supports a context window of 128K tokens. For reference, that is roughly equivalent to 256 pages of text.

What is the max output length of DeepSeek Reasoner?

DeepSeek Reasoner can generate up to 64K tokens in a single response.

What is the knowledge cutoff of DeepSeek Reasoner?

DeepSeek Reasoner has a knowledge cutoff date of Jul 2024. This means the model was trained on data available up to that date.

What types of input can DeepSeek Reasoner process?

DeepSeek Reasoner accepts the following input types: text. It produces: text.

Does DeepSeek Reasoner support tool use (function calling)?

Yes, DeepSeek Reasoner supports tool use (function calling), allowing it to interact with external tools, APIs, and data sources as part of its response flow.

How much does it cost?
The DeepSeek Reasoner API is available through the User-Pays Model. As a developer, you can add the DeepSeek Reasoner API to your app for free — your users pay for their own AI costs directly.
Price per 1M tokens
Input$0.56
Output$1.68
How do I access the DeepSeek Reasoner API?

You can access the DeepSeek Reasoner API with just a few lines of JavaScript — no API keys, no backend, and no configuration required. Include the Puter.js library in your project and start making calls right away. For more details, check out our documentation.

Does the DeepSeek Reasoner API work with React / Vue / Vanilla JS / Node / etc.?

Yes — the DeepSeek Reasoner API works with any JavaScript framework, Node.js, or plain HTML through Puter.js. Just include the library and start building. See the documentation for more details.

Get started with Puter.js

Add DeepSeek Reasoner to your app without worrying about API keys or setup.

Read the Docs View Tutorials