Phi 4 Mini Instruct
Released by Microsoft in 2025, Phi 4 Mini Instruct is an chat model. Phi-4-mini-instruct is a lightweight open model built upon synthetic data and filtered publicly available websites - with a focus on high-quality, reasoning dense data. The model belongs to the Phi-4...
by Microsoft · 128K token context window
Best for
- low-latency chat and routing
- request routing and triage
- text classification
Ways to use Phi 4 Mini Instruct in osFoundry
Connect with your own key (BYOK)
Open the key dialog and paste your Microsoft API key. osFoundry discovers Phi 4 Mini Instruct automatically — assign it to a Maestro role (router, direct, orchestrator, or fallback) in the Pipeline tab and it is live in every chat. Your key, your provider account — no token markup.
Use it in a Room App
Room Apps declare AI features in their manifest, then call them with invokeAI:
import { invokeAI } from '@osfoundry/app-sdk'
// 'summarize' is an AI feature declared in your app manifest.
const result = await invokeAI('summarize', userText)
Call it from your own apps
Once a model is wired into your workspace you can host it as an API and reach it from your own services, scripts, or CI — outside osFoundry.
Run Phi 4 Mini Instruct yourself
Phi 4 Mini Instruct is also available as open weights — self-host it for full data control and no per-token cost. See that page for GPU requirements and a cost comparison against API pricing.
Phi 4 Mini Instruct vs similar models
Licence
Hosted — usage subject to provider terms — Hosted-only model — usage governed by the provider's API terms. Bring your own provider key.
No weights distributed; usage subject to provider terms.
Frequently asked about Phi 4 Mini Instruct
How much does Phi 4 Mini Instruct cost?
Phi 4 Mini Instruct is metered at $ 0.080 /1M for input, and $ 0.350 /1M for output. Bring your own Microsoft API key — osFoundry passes through provider pricing without markup.
Can I use Phi 4 Mini Instruct commercially?
Commercial use is allowed with conditions. Hosted-only model — usage governed by the provider's API terms. Bring your own provider key. No weights distributed; usage subject to provider terms.
What is the context window of Phi 4 Mini Instruct?
Phi 4 Mini Instruct supports a 128K token context window.
Can I run Phi 4 Mini Instruct locally?
No — Phi 4 Mini Instruct is hosted only and accessed via the Microsoft API. An open-weights equivalent is available to self-host — see the cross-link above.
What is Phi 4 Mini Instruct best at?
Phi 4 Mini Instruct is well-suited to low-latency chat and routing, request routing and triage, text classification.
How do I use Phi 4 Mini Instruct in osFoundry?
Paste your Microsoft API key in the key dialog (or deploy the open weights for self-hostable models), assign Phi 4 Mini Instruct to a Maestro role in the Pipeline tab, then use it in chat, Room Apps via invokeAI, or your own apps.
Published by Microsoft on October 17, 2025. Source: https://openrouter.ai/microsoft/phi-4-mini-instruct