---
title: "Change a thread agent's model"
method: PATCH
path: "/threads/{id}/engine"
---

# Change a thread agent's model

`PATCH /threads/{id}/engine`

## Request

- Base URL: `https://api.agentsky.dev/v1`
- URL: `https://api.agentsky.dev/v1/threads/{id}/engine`
- Auth: HTTP bearer

Change the model (`llm`) or the thinking level (`reasoningEffort`, null for the default of the model) of one agent, as the pickers on the web do. Applies from its next turn.

## Path parameters

- `id` string, required

## Query parameters

- `column` string

## Request body

- object
  - `llm` string
  - `reasoningEffort` string, nullable

## Response `200`

OK

- object
  - `llm` string
  - `reasoningEffort` string, nullable

## Other responses

- `400`: Error — { error: { code, message } }
- `401`: Error — { error: { code, message } }
- `403`: Error — { error: { code, message } }
- `404`: Error — { error: { code, message } }
- `422`: Error — { error: { code, message } }
- `default`: Error — { error: { code, message, request_id } }

## Changes

- **2026-11-02** `e5e8f0229a99`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/agentsky/apis/agentsky-developer-api/changes/threads/:id/engine/patch.md)

---

[API](https://skmtc.dev/agentsky/apis/agentsky-developer-api.md) - [All operations](https://skmtc.dev/agentsky/apis/agentsky-developer-api/llms.txt) - [OpenAPI document](https://skmtc.dev/agentsky/apis/agentsky-developer-api/revisions/0d435187cd55?raw)