---
title: "Create call"
method: POST
path: "/realtime/calls"
tags: ["Realtime"]
---

# Create call

`POST /realtime/calls`

Create a new Realtime API call over WebRTC and receive the SDP answer needed
to complete the peer connection.

## Response `201`

Realtime call created successfully.

## Changes

- **2026-05-07** `81aa43d6a9f1` — 5 info
  - added the new optional request property `session/allOf[subschema #1: Realtime session configuration]/audio/input/transcription/delay`
  - added the new optional request property `session/allOf[subschema #1: Realtime session configuration]/parallel_tool_calls`
  - added the new optional request property `session/allOf[subschema #1: Realtime session configuration]/reasoning`
  - added the new `gpt-realtime-2` enum value to the request property `session/allOf[subschema #1: Realtime session configuration]/model/anyOf[subschema #2]/`
  - …1 more
- **2026-05-04** `64494d56c425` — 2 breaking
  - the `session/allOf[subschema #1: Realtime session configuration]/prompt/anyOf[subschema #1]/variables/anyOf[subschema #1: Prompt Variables]/additionalProperties/anyOf[subschema #3: Input image]/image_url/anyOf[subschema #1]/` request property type/format changed from `string`/`` to `string`/`uri`
  - the `session/allOf[subschema #1: Realtime session configuration]/prompt/anyOf[subschema #1]/variables/anyOf[subschema #1: Prompt Variables]/additionalProperties/anyOf[subschema #4: Input file]/file_url` request property type/format changed from `string`/`` to `string`/`uri`
- **2026-04-29** `5b98524f8dee` — 1 breaking
  - the `session/allOf[subschema #1: Realtime session configuration]/tools/items/anyOf[subschema #2: MCP tool]/server_url` request property type/format changed from `string`/`` to `string`/`uri`

[Change history](https://skmtc.dev/openai/apis/openai-api/changes/realtime/calls/post.md)

---

[API](https://skmtc.dev/openai/apis/openai-api.md) · [All operations](https://skmtc.dev/openai/apis/openai-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/openai/openai-api/revisions/5b751bfbf149/schema)