gpt-oss-20b-heretic
vlx1's gpt-oss-20b-heretic packs 20 billion parameters into a chat model. gpt-oss-20b-heretic is an open-weights chat model with roughly 20 billion parameters.
by vlx1 · 20B parameters
Best for
Ways to use gpt-oss-20b-heretic in osFoundry
Connect with your own key (BYOK)
Open the key dialog and paste your vlx1 API key. osFoundry discovers gpt-oss-20b-heretic 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
gpt-oss-20b-heretic 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 gpt-oss-20b-heretic
gpt-oss-20b-heretic runs on a single 16GB consumer GPU (~12 GB VRAM with KV-cache headroom). Full-precision inference fits on a single H100 80GB at FP16 precision (~48 GB).
gpt-oss-20b-heretic vs similar models
Licence
Unspecified — Licence terms not specified — verify the upstream model card before commercial use.
Check upstream documentation.
Frequently asked about gpt-oss-20b-heretic
Is gpt-oss-20b-heretic free to use?
gpt-oss-20b-heretic 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 gpt-oss-20b-heretic 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 gpt-oss-20b-heretic need?
Approximately 12 GB at Q4 quantisation, or 48 GB at full FP16 precision. Fits on a single 24GB consumer GPU.
Can I run gpt-oss-20b-heretic locally?
Yes. gpt-oss-20b-heretic is open-weights and runs locally on a workstation GPU. osFoundry's local runtime handles model loading, quantisation, and routing.
What is gpt-oss-20b-heretic best at?
gpt-oss-20b-heretic is well-suited to text generation.
How do I use gpt-oss-20b-heretic in osFoundry?
Paste your vlx1 API key in the key dialog (or deploy the open weights for self-hostable models), assign gpt-oss-20b-heretic to a Maestro role in the Pipeline tab, then use it in chat, Room Apps via invokeAI, or your own apps.
Published by vlx1 on April 14, 2026. Source: https://huggingface.co/vlx1/gpt-oss-20b-heretic