---
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

- **2026-07-09** `e0508a503b84` — 7 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/anyOf[subschema #2: Input text]/prompt_cache_breakpoint`
  - added the new optional request property `session/allOf[subschema #1: Realtime session configuration]/prompt/anyOf[subschema #1]/variables/anyOf[subschema #1: Prompt Variables]/additionalProperties/anyOf[subschema #3: Input image]/prompt_cache_breakpoint`
  - added the new optional request property `session/allOf[subschema #1: Realtime session configuration]/prompt/anyOf[subschema #1]/variables/anyOf[subschema #1: Prompt Variables]/additionalProperties/anyOf[subschema #4: Input file]/prompt_cache_breakpoint`
  - added the new optional request property `session/allOf[subschema #1: Realtime session configuration]/tools/items/anyOf[subschema #2: MCP tool]/allowed_callers`
  - …3 more
- **2026-06-17** `827fa3e74ce9` — 1 info
  - added the new optional request property `session/allOf[subschema #1: Realtime session configuration]/tools/items/anyOf[subschema #2: MCP tool]/tunnel_id`
- …earlier changes not shown

[Full 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/e0508a503b84/schema)