Claude Opus 4.5 API

Access Claude Opus 4.5 from Anthropic using Puter.js AI API.

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Model Card

Claude Opus 4.5 is Anthropic's most intelligent model, released November 2025. It sets the standard for production code, sophisticated agents, and complex enterprise tasks—scoring higher than Anthropic's own engineering candidates on technical tests.

Context Window

200K

tokens

Max Output

64,000

tokens

Input Cost

$5

per million tokens

Output Cost

$25

per million tokens

API Usage Example

Add Claude Opus 4.5 to your app with just a few lines of code.
No API keys, no backend, no configuration required.

<html>
<body>
    <script src="https://js.puter.com/v2/"></script>
    <script>
        puter.ai.chat("Explain quantum computing in simple terms", {
            model: "anthropic/claude-opus-4-5"
        }).then(response => {
            document.body.innerHTML = response.message.content;
        });
    </script>
</body>
</html>

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Get started with Puter.js

Add Claude Opus 4.5 to your app without worrying about API keys or setup.

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