---
title: "Stream agent session events"
method: GET
path: "/agents/sessions/{session_id}/events"
tags: ["Agents"]
---

# Stream agent session events

`GET /agents/sessions/{session_id}/events`

Streams live events for an agent session. See [session events](https://developers.openai.com/api/docs/guides/agents-api/sessions/events).

## Path parameters

- `session_id` string, required

## Response `200`

A live stream of session events.

## Other responses

- `400` — The request was invalid.
- `401` — Authentication or project context was missing.
- `403` — The API key lacks the required permission.
- `404` — The requested session or event was not found.
- `409` — The request conflicted with the current session state.
- `500` — An internal error occurred.
- `503` — The service is temporarily unavailable.

## Changes

- **2026-09-25** `82d76d5c86cf` — 5 warning
  - added the new `ultrafast` enum value to the `oneOf[#/components/schemas/SessionEventAgentSessionCreated]/session/agent/service_tier` response property for the response status `200`
  - added the new `ultrafast` enum value to the `oneOf[#/components/schemas/SessionEventAgentSessionFailed]/session/agent/service_tier` response property for the response status `200`
  - added the new `ultrafast` enum value to the `oneOf[#/components/schemas/SessionEventAgentSessionIdle]/session/agent/service_tier` response property for the response status `200`
  - added the new `ultrafast` enum value to the `oneOf[#/components/schemas/SessionEventAgentSessionInProgress]/session/agent/service_tier` response property for the response status `200`
  - …1 more
- …earlier changes not shown

[Full history](https://skmtc.dev/openai/apis/openapi/changes/agents/sessions/:session_id/events/get.md)

---

[API](https://skmtc.dev/openai/apis/openapi.md) · [All operations](https://skmtc.dev/openai/apis/openapi/llms.txt) · [OpenAPI document](https://skmtc.dev/openai/apis/openapi/revisions/d86203de41ae?raw)