Anthropic: Claude Sonnet 4.6

Access Claude Sonnet 4.6 from Anthropic using Puter.js AI API.

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Model Card

Claude Sonnet 4.6 is Anthropic's latest mid-tier model released February 2026, delivering near-flagship Opus-level performance in coding, computer use, and agentic tasks at a fraction of the cost ($3/$15 per million tokens). It features a 1M token context window in beta, scores 79.6% on SWE-bench Verified and 72.5% on OSWorld. Developers preferred it over both Sonnet 4.5 (~70% of the time) and even Opus 4.5 (~59%) in real-world coding tests.

Context Window 1M

tokens

Max Output 64K

tokens

Input Cost $3

per million tokens

Output Cost $15

per million tokens

Input text, image, pdf

modalities

Tool Use Yes

 

Knowledge Cutoff Aug 2025

 

Release Date Feb 17, 2026

 

API Usage Example

Add Claude Sonnet 4.6 to your app with just a few lines of code.
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: "anthropic/claude-sonnet-4-6"
}).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: "anthropic/claude-sonnet-4-6"
        }).then(response => {
            document.body.innerHTML = response.message.content;
        });
    </script>
</body>
</html>

# pip install openai
from openai import OpenAI

client = OpenAI(
    base_url="https://api.puter.com/puterai/openai/v1/",
    api_key="YOUR_PUTER_AUTH_TOKEN",
)

response = client.chat.completions.create(
    model="anthropic/claude-sonnet-4-6",
    messages=[
        {"role": "user", "content": "Explain quantum computing in simple terms"}
    ],
)

print(response.choices[0].message.content)

curl https://api.puter.com/puterai/openai/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_PUTER_AUTH_TOKEN" \
  -d '{
    "model": "anthropic/claude-sonnet-4-6",
    "messages": [
      {"role": "user", "content": "Explain quantum computing in simple terms"}
    ]
  }'

View full documentation →

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Claude Haiku 4.5

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Frequently Asked Questions

How do I use Claude Sonnet 4.6?

You can access Claude Sonnet 4.6 by Anthropic through Puter.js AI API. Include the library in your web app or Node.js project and start making calls with just a few lines of JavaScript — no backend and no configuration required. You can also use it with Python or cURL via Puter's OpenAI-compatible API.

Is Claude Sonnet 4.6 free?

Yes, it is free if you're using it through Puter.js. With the User-Pays Model, you can add Claude Sonnet 4.6 to your app at no cost — your users pay for their own AI usage directly, making it completely free for you as a developer.

What is the pricing for Claude Sonnet 4.6?
Pricing for Claude Sonnet 4.6 is based on the number of input and output tokens used per request.
Price per 1M tokens
Input$3
Output$15
Who created Claude Sonnet 4.6?

Claude Sonnet 4.6 was created by Anthropic and released on Feb 17, 2026.

What is the context window of Claude Sonnet 4.6?

Claude Sonnet 4.6 supports a context window of 1M tokens. For reference, that is roughly equivalent to 2,000 pages of text.

What is the max output length of Claude Sonnet 4.6?

Claude Sonnet 4.6 can generate up to 64K tokens in a single response.

What is the knowledge cutoff of Claude Sonnet 4.6?

Claude Sonnet 4.6 has a knowledge cutoff date of Aug 2025. This means the model was trained on data available up to that date.

What types of input can Claude Sonnet 4.6 process?

Claude Sonnet 4.6 accepts the following input types: text, image, pdf. It produces: text.

Does Claude Sonnet 4.6 support tool use (function calling)?

Yes, Claude Sonnet 4.6 supports tool use (function calling), allowing it to interact with external tools, APIs, and data sources as part of its response flow.

Does it work with React / Vue / Vanilla JS / Node / etc.?

Yes — the Claude Sonnet 4.6 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 Claude Sonnet 4.6 to your app without worrying about API keys or setup.

Read the Docs View Tutorials