Microsoft: Phi 4 Mini
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Phi-4 Mini is a 3.8-billion-parameter small language model developed by Microsoft, designed to deliver strong reasoning performance in a compact form factor. It uses a dense decoder-only Transformer architecture with grouped-query attention and supports context lengths up to 128K tokens.
The model excels at math, logic, coding, instruction following, and function calling — making it well-suited for agentic workflows that integrate external tools and APIs. It supports over 20 languages thanks to its expanded 200K-token vocabulary.
Despite its small size, Phi-4 Mini performs competitively with much larger models on text-based reasoning tasks. It scored 88.6% on GSM8K and 83.7% on ARC-Challenge. It's a strong choice for developers who need capable reasoning at low latency and minimal compute cost.
Context Window 131K
tokens
Max Output 128K
tokens
Input Cost $0.08
per million tokens
Output Cost $0.35
per million tokens
Release Date Oct 17, 2025
Code Example
Add AI to your app with the Puter.js AI API — no API keys or setup required.
// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';
puter.ai.chat("Explain quantum computing in simple terms").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").then(response => {
document.body.innerHTML = response.message.content;
});
</script>
</body>
</html>
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Frequently Asked Questions
You can access Phi 4 Mini by Microsoft 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.
Yes, it is free if you're using it through Puter.js. With the User-Pays Model, you can add Phi 4 Mini to your app at no cost — your users pay for their own AI usage directly, making it completely free for you as a developer.
| Price per 1M tokens | |
|---|---|
| Input | $0.08 |
| Output | $0.35 |
Phi 4 Mini was created by Microsoft and released on Oct 17, 2025.
Phi 4 Mini supports a context window of 131K tokens. For reference, that is roughly equivalent to 262 pages of text.
Phi 4 Mini can generate up to 128K tokens in a single response.
Yes — the Phi 4 Mini 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.
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