---
title: "Creates a participant in a benchmark."
method: POST
path: "/benchmark/{benchmarkId}/participants"
tags: ["Benchmark"]
---

# Creates a participant in a benchmark.

`POST /benchmark/{benchmarkId}/participants`

## Path parameters

- `benchmarkId` string, required

## Request body

- CreateBenchmarkParticipantEndpointInput
  - `name` string, required — The name of the participant.
  - `family` string, nullable — The family the underlying model belongs to (e.g. "Flux", "GPT"), if any.
  - `lab` string, nullable — The lab that makes the model (e.g. "OpenAI", "Black Forest Labs"), if any.
  - `proprietaryName` string, nullable — The vendor-facing display name of the model, if any.
  - `licenseType` 'OpenSource' | 'Proprietary' | 'null', nullable — The license classification of the underlying model, if any.
  - `logo` ExistingAssetInput
    - `name` string, required
    - `metadata` object, nullable
    - `identifier` string, nullable

## Response `200`

OK

- CreateBenchmarkParticipantEndpointOutput
  - `participantId` string, required — The id of the created participant.
  - `datasetId` string, required — The id of the participant's dataset.

## Other responses

- `400` — Bad Request
- `401` — Unauthenticated
- `403` — Forbidden

## Changes

- **2026-08-13** `d779de93a5ee` — 1 breaking, 1 warning, 2 info
  - the `licenseType` request property type/format changed from ``/`` to `string`/``
  - removed `#/components/schemas/ModelLicenseType` from the `licenseType` request property `allOf` list
  - the request property `licenseType` became nullable
  - added `#/components/schemas/ModelLicenseType` to the `licenseType` request property `oneOf` list

[Change history](https://skmtc.dev/rapidata/apis/rapidata-api/changes/benchmark/:benchmarkId/participants/post.md)

---

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