---
title: "Delete cohort"
method: DELETE
path: "/experiments/{experimentId}/cohorts/{cohortId}"
tags: ["cohorts"]
---

# Delete cohort

`DELETE /experiments/{experimentId}/cohorts/{cohortId}`

Delete a cohort and mark all its participants as deleted.

**Warning:** This operation is permanent. All participants in the cohort will be marked as DELETED status.

## Path parameters

- `experimentId` string, required
- `cohortId` string, required

## Response `200`

Cohort deleted successfully

- object
  - `id` string
  - `deleted` boolean

## Other responses

- `401` — Unauthorized - Missing or invalid API key
- `403` — Forbidden - Insufficient permissions or browser access attempted
- `404` — Not found - Resource doesn't exist
- `429` — Too many requests - Rate limit exceeded

## Changes

- **2025-12-11** `c3b80417b1e2` — 1 info
  - endpoint added
- **2025-12-10** `427ac306a646` — 1 breaking
  - api path removed without deprecation

[Change history](https://skmtc.dev/pair-code/apis/deliberate-lab-api/changes/experiments/:experimentId/cohorts/:cohortId/delete.md)

---

[API](https://skmtc.dev/pair-code/apis/deliberate-lab-api.md) · [All operations](https://skmtc.dev/pair-code/apis/deliberate-lab-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/pair-code/deliberate-lab-api/revisions/f58e6c25e4f8/schema)