anthropic/claude-opus-4-1
Model Card
Claude Opus 4.1 is an August 2025 incremental upgrade to Opus 4 focused on agentic tasks and real-world coding. It improved coding accuracy to 74.5% on SWE-bench with finer-grained refactoring and more precise bug fixes.
Context Window
200K
tokens
Max Output
32,000
tokens
Input Cost
$15
per million tokens
Output Cost
$75
per million tokens
API Usage Example
Add Claude Opus 4.1 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-4-1"
}).then(response => {
document.body.innerHTML = response.message.content;
});
</script>
</body>
</html>
Get started with Puter.js
Add Claude Opus 4.1 to your app without worrying about API keys or setup.
Read the Docs View Tutorials