Qwen3.5-4B-hardened
hirundo-io's Qwen3.5-4B-hardened packs 4 billion parameters into a image-generation model. Qwen3.5-4B-hardened is an open-weights image model with roughly 4 billion parameters.
by hirundo-io · 4B parameters
Best for
Ways to use Qwen3.5-4B-hardened in osFoundry
Connect with your own key (BYOK)
Open the key dialog and paste your hirundo-io API key. osFoundry discovers Qwen3.5-4B-hardened 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.
Deploy a dedicated endpoint
Qwen3.5-4B-hardened is open-weights — run it locally for free, or deploy a dedicated GPU endpoint in your workspace for reserved capacity with no rate limits.
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.
What hardware can run Qwen3.5-4B-hardened
Qwen3.5-4B-hardened runs on a single 16GB consumer GPU (~3 GB VRAM with KV-cache headroom). Full-precision inference fits on a single H100 80GB at FP16 precision (~10 GB).
Qwen3.5-4B-hardened vs similar models
Licence
Unspecified — Licence terms not specified — verify the upstream model card before commercial use.
Check upstream documentation.
Frequently asked about Qwen3.5-4B-hardened
Is Qwen3.5-4B-hardened free to use?
Qwen3.5-4B-hardened is free to run locally on your own hardware. Hosted access through osFoundry is metered (input Free (local), output Free (local)). You can switch between local and hosted at any time.
Can I use Qwen3.5-4B-hardened commercially?
Commercial use is allowed with conditions. Licence terms not specified — verify the upstream model card before commercial use. Check upstream documentation.
How much VRAM does Qwen3.5-4B-hardened need?
Approximately 3 GB at Q4 quantisation, or 10 GB at full FP16 precision. Fits on a single 24GB consumer GPU.
Can I run Qwen3.5-4B-hardened locally?
Yes. Qwen3.5-4B-hardened is open-weights and runs locally on a workstation GPU. osFoundry's local runtime handles model loading, quantisation, and routing.
What is Qwen3.5-4B-hardened best at?
Qwen3.5-4B-hardened is well-suited to image text to text.
How do I use Qwen3.5-4B-hardened in osFoundry?
Paste your hirundo-io API key in the key dialog (or deploy the open weights for self-hostable models), assign Qwen3.5-4B-hardened to a Maestro role in the Pipeline tab, then use it in chat, Room Apps via invokeAI, or your own apps.
Published by hirundo-io on April 30, 2026. Source: https://huggingface.co/hirundo-io/Qwen3.5-4B-hardened