Body Builder (beta)
Released by openrouter in 2025, Body Builder (beta) is an chat model. Transform your natural language requests into structured OpenRouter API request objects. Describe what you want to accomplish with AI models, and Body Builder will construct the appropriate API calls. Example:...
by openrouter · 128K token context window
Best for
- low-latency chat and routing
- request routing and triage
- text classification
Ways to use Body Builder (beta) in osFoundry
Connect with your own key (BYOK)
Open the key dialog and paste your openrouter API key. osFoundry discovers Body Builder (beta) 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.
Body Builder (beta) vs similar models
| Model | Org | Params | Context | Input price | Self-host |
|---|
| Body Builder (beta) | openrouter | — | 128K | $ -1000000.000 /1M | API only |
| Rnj 1 Instruct | EssentialAI | — | 33K | $ 0.150 /1M | API only |
| Trinity Mini | Arcee AI | — | 131K | $ 0.045 /1M | API only |
| DeepSeek V3.1 Nex N1 | Nex AGI | — | 131K | $ 0.135 /1M | API only |
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 Body Builder (beta)
How much does Body Builder (beta) cost?
Body Builder (beta) is metered at $ -1000000.000 /1M for input, and $ -1000000.000 /1M for output. Bring your own openrouter API key — osFoundry passes through provider pricing without markup.
Can I use Body Builder (beta) 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 Body Builder (beta)?
Body Builder (beta) supports a 128K token context window.
Can I run Body Builder (beta) locally?
No — Body Builder (beta) is hosted only and accessed via the openrouter API.
What is Body Builder (beta) best at?
Body Builder (beta) is well-suited to low-latency chat and routing, request routing and triage, text classification.
How do I use Body Builder (beta) in osFoundry?
Paste your openrouter API key in the key dialog (or deploy the open weights for self-hostable models), assign Body Builder (beta) to a Maestro role in the Pipeline tab, then use it in chat, Room Apps via invokeAI, or your own apps.
Published by openrouter on December 5, 2025. Source: https://openrouter.ai/openrouter/bodybuilder