---
title: "Changes to Stats Group Runs"
method: POST
path: "/api/v1/runs/group/stats"
---

# Changes to Stats Group Runs

`POST /api/v1/runs/group/stats`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 1 of 48 revisions.

- **2026-05-27** `a0acb3a6a101` — 10 breaking

## Changes

- **2026-05-27** `a0acb3a6a101` — 10 breaking
  - response property `completion_cost` list-of-types was widened by adding types `number` to media type `application/json` of response `200`
  - response property `cost_p50` list-of-types was widened by adding types `number` to media type `application/json` of response `200`
  - response property `cost_p99` list-of-types was widened by adding types `number` to media type `application/json` of response `200`
  - response property `prompt_cost` list-of-types was widened by adding types `number` to media type `application/json` of response `200`
  - response property `total_cost` list-of-types was widened by adding types `number` to media type `application/json` of response `200`
  - the `completion_cost/anyOf[subschema #1]/` response's property type/format changed from `string`/`` to `number`/`` for status `200`
  - the `cost_p50/anyOf[subschema #1]/` response's property type/format changed from `string`/`` to `number`/`` for status `200`
  - the `cost_p99/anyOf[subschema #1]/` response's property type/format changed from `string`/`` to `number`/`` for status `200`
  - the `prompt_cost/anyOf[subschema #1]/` response's property type/format changed from `string`/`` to `number`/`` for status `200`
  - the `total_cost/anyOf[subschema #1]/` response's property type/format changed from `string`/`` to `number`/`` for status `200`

---

[Operation](https://skmtc.dev/langchain-ai/apis/langsmith/docs/api/v1/runs/group/stats/post.md) · [API](https://skmtc.dev/langchain-ai/apis/langsmith.md) · [Page](https://skmtc.dev/langchain-ai/apis/langsmith/changes/api/v1/runs/group/stats/post)