---
title: "Apply Model Family Handler"
method: POST
path: "/api/settings/apply-model-family"
tags: ["runtime_mutations", "settings"]
---

# Apply Model Family Handler

`POST /api/settings/apply-model-family`

Apply a model family by fanning it out into the per-role model settings.

Persists concrete flagship values for the agent roles, so each role holds a
concrete model after onboarding. The family itself is not persisted — it is
only a transient way to propagate these per-role defaults. Users can still
change any role afterward.

## Request body

- ApplyModelFamilyRequest
  - `family` string, required

## Response `200`

Successful Response

- unknown

## Other responses

- `422` — Validation Error

---

[API](https://skmtc.net/quadrillion/apis/quadrillion-cloud-api.md) · [All operations](https://skmtc.net/quadrillion/apis/quadrillion-cloud-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/quadrillion/quadrillion-cloud-api/revisions/399077308c86/schema)