GPT-Realtime-2.1 Mini API reference

GPT-Realtime-2.1 Mini pairs compact reasoning with streaming voice for short, responsive audio interactions.

Call GPT-Realtime-2.1 Mini from your own code with one PopNow API key. Below are the exact model IDs to send, every input field the model accepts, what each request costs in USD, and a request you can paste into a terminal.

At a glance

Made by: OpenAI
Output: Audio
From: $0.00048 USD per_1k_tokens
Model IDs: openai/gpt-realtime-2.1-mini/realtime

Prices are in USD, charged to your separate API wallet. A task reserves the maximum possible charge when accepted and settles actual usage on completion; any remainder is released. Failed tasks are not charged. Call POST /api/v1/jobs/quote for an exact quote before running.

Realtime Voice

openai/gpt-realtime-2.1-mini/realtime

Price

Option	USD
`Default`	$0.00048 per_1k_tokens

Parameters

Field	Type	Default	Allowed	What it does
`prompt`Optional	`string`	—	up to 4,096 characters	Text that starts a single spoken response; live audio uses the Realtime WebSocket.
`voice_id`Optional	`string`	—	alloy, ash, ballad, coral, echo, sage, shimmer, verse, marin, cedar	Preset speaking voice; select before the first audio response.
`reasoning_effort`Optional	`string`	—	minimal, low, medium, high, xhigh	Reasoning effort for the spoken response; reasoning consumes output tokens.
`output_format`Optional	`string`	—	pcm, g711_ulaw, g711_alaw	Live playback encoding; single-response tasks return a matching WAV container.
`speed`Optional	`number`	`1`	0.25 to 1.5	Speaking-speed multiplier for output audio.
`max_tokens`Optional	`integer`	`512`	16 to 32000	Per-turn output cap, including reasoning, text and audio tokens.
`max_context_tokens`Optional	`integer`	`4096`	512 to 123888	Retained-history cap; this, the 4096-token instruction allowance and output must fit 128000.
`audio_input_format`Optional	`string`	`pcm`	pcm, g711_ulaw, g711_alaw	Encoding of live microphone samples; PCM is 24 kHz mono 16-bit, G.711 is 8 kHz.
`audio_noise_reduction`Optional	`string`	`near_field`	near_field, far_field, none	Input denoising profile for a close microphone, room microphone, or preprocessed audio.
`realtime_session`Optional	`object`	—	—	Advanced native session configuration; overlapping regular controls must agree. Function tools are executed by your application.

Example request

This request runs as it is; any field you leave out uses its default. Put your key in POPNOW_API_KEY first.

POST /api/v1/jobs/createTask

curl -X POST "https://api.popnow.ai/api/v1/jobs/createTask" \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "model": "openai/gpt-realtime-2.1-mini/realtime",
  "input": {
    "prompt": "A bright, cheerful scene with soft natural light"
  }
}'

The response carries a taskId straight away. Read the result with GET /api/v1/jobs/recordInfo, or add callBackUrl to be notified.

GET /api/v1/jobs/recordInfo

curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=TASK_ID_FROM_CREATE_TASK" \
  -H "Authorization: Bearer $POPNOW_API_KEY"