gpt-oss-120b (free)
Built by OpenAI, gpt-oss-120b (free) is an chat model with a 131K token context window. gpt-oss-120b is an open-weight, 117B-parameter Mixture-of-Experts (MoE) language model from OpenAI designed for high-reasoning, agentic, and general-purpose production use cases. It activates 5.1B parameters per forward pass and is optimized...
by OpenAI · 131K token context window
Best for
- low-latency chat and routing
- request routing and triage
- text classification
Ways to use gpt-oss-120b (free) in osFoundry
Connect with your own key (BYOK)
Open the key dialog and paste your OpenAI API key. osFoundry discovers gpt-oss-120b (free) 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 gpt-oss-120b (free) yourself
gpt-oss-120b (free) 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.
gpt-oss-120b (free) 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 gpt-oss-120b (free)
How much does gpt-oss-120b (free) cost?
gpt-oss-120b (free) is metered at Free for input, and Free for output. Bring your own OpenAI API key — osFoundry passes through provider pricing without markup.
Can I use gpt-oss-120b (free) 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 gpt-oss-120b (free)?
gpt-oss-120b (free) supports a 131K token context window.
Can I run gpt-oss-120b (free) locally?
No — gpt-oss-120b (free) is hosted only and accessed via the OpenAI API. An open-weights equivalent is available to self-host — see the cross-link above.
What is gpt-oss-120b (free) best at?
gpt-oss-120b (free) is well-suited to low-latency chat and routing, request routing and triage, text classification.
How do I use gpt-oss-120b (free) in osFoundry?
Paste your OpenAI API key in the key dialog (or deploy the open weights for self-hostable models), assign gpt-oss-120b (free) to a Maestro role in the Pipeline tab, then use it in chat, Room Apps via invokeAI, or your own apps.
Published by OpenAI on August 5, 2025. Source: https://openrouter.ai/openai/gpt-oss-120b:free