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

# Create call

`POST /realtime/calls`

## Request

- Base URL: `https://api.openai.com/v1`
- URL: `https://api.openai.com/v1/realtime/calls`
- Auth: HTTP bearer

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

## Request body `multipart/form-data`

- RealtimeCallCreateRequest (unresolved $ref)

## Response `201`

Realtime call created successfully.

## Changes

- **2026-10-26** `410e6429083a`: 3 info
  - added the new optional request property `session/allOf[subschema #1: Realtime session configuration]/prompt/anyOf[subschema #1]/variables/anyOf[subschema #1: Prompt Variables]/additionalProperties/oneOf[subschema #2: Input text]/prompt_cache_breakpoint/ttl`
  - added the new optional request property `session/allOf[subschema #1: Realtime session configuration]/prompt/anyOf[subschema #1]/variables/anyOf[subschema #1: Prompt Variables]/additionalProperties/oneOf[subschema #3: Input image]/prompt_cache_breakpoint/ttl`
  - added the new optional request property `session/allOf[subschema #1: Realtime session configuration]/prompt/anyOf[subschema #1]/variables/anyOf[subschema #1: Prompt Variables]/additionalProperties/oneOf[subschema #4: Input file]/prompt_cache_breakpoint/ttl`
- **2026-10-05** `491c868adbdb`: 1 info
  - the `session/allOf[subschema #1: Realtime session configuration]/audio/input/noise_reduction` request property type was generalized from `object` to no type
- **2026-10-05** `7f654af7f94f`: 1 info
  - endpoint added

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

---

[API](https://skmtc.dev/omnistack-sh/apis/openai-api.md) - [All operations](https://skmtc.dev/omnistack-sh/apis/openai-api/llms.txt) - [OpenAPI document](https://skmtc.dev/omnistack-sh/apis/openai-api/revisions/0a26f104d35f?raw)