GPT Audio 1.5

openai/gpt-audio-1.5

OpenAI's February 2026 speech-to-speech model for Chat Completions, taking text or audio and replying with audio and text, with a 128K context. Successor to gpt-audio and gpt-4o-audio-preview; works per request rather than as a live session.

Get API Key Read the Docs

curl "$AUDIOLAB_API_URL/v1/audio/speech-to-speech" \
  -H "Authorization: Bearer $AUDIOLAB_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "openai/gpt-audio-1.5",
  "input_audio": {
    "data": "BASE64_AUDIO",
    "format": "wav",
    "channels": 1
  },
  "output_audio": {
    "format": "wav"
  }
}'

Input Price: $27.20 / 1M tokens
Output Price: $54.40 / 1M tokens
Input: Audio
Output: Audio

Capabilities

Explore what GPT Audio 1.5 supports, then use the API section for a request tailored to this model.

BatchAudio inputAudio outputTools

Languages

Multilingual

Model Information

Provider: OpenAI
Product: Conversational
Release Date: Feb 23, 2026
Data Policy: No training
Region: Global
Input: Audio
Output: Audio

Provider Documentation

Playground

Try GPT Audio 1.5 by OpenAI. Requests use the selected workspace’s credits and API pricing.

GPT Audio 1.5

This model uses a dedicated input format. Explore its API example or open the supported playground.

Open playground

Providers

Compare available endpoints, pricing, and context limits for GPT Audio 1.5.

Provider	Context	Output	Input Price	Output Price	Endpoint
OpenAI	Not specified	Audio	$27.20 / 1M tokens	$54.40 / 1M tokens	`openai/gpt-audio-1.5:openai`

Prices are catalog rates. Your workspace’s estimate and endpoint pricing determine the final charge.

Input and Output Limits

Formats and limits AudioLab enforces on each request.

Limit	Value
Max bytes	25000000
Input formats	wav, mp3
Output formats	wav, mp3, aac, flac, opus, pcm16

Provider Notes

gpt-audio-1.5 is request/response only and uses Chat Completions with audio input and output. gpt-realtime and gpt-realtime-1.5 support full-duplex WebSockets and the one-turn REST wrapper. Realtime PCM16 is fixed at 24 kHz, with G.711 u-law and A-law at 8 kHz also supported. gpt-4o-audio-preview is unavailable; use gpt-audio-1.5 instead.

Status

Current catalog availability. Your workspace’s access is checked separately before a request runs.

Checking availability…

A live availability check is not available right now.

Getting Started

Use your workspace API key and the exact model identifier below. Set the API URL to the endpoint shown in your workspace and keep credentials on your server.

curl "$AUDIOLAB_API_URL/v1/audio/speech-to-speech" \
  -H "Authorization: Bearer $AUDIOLAB_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "openai/gpt-audio-1.5",
  "input_audio": {
    "data": "BASE64_AUDIO",
    "format": "wav",
    "channels": 1
  },
  "output_audio": {
    "format": "wav"
  }
}'

Read the Endpoint Reference

Request Parameters

Available parameters depend on the provider and request format. The endpoint reference explains accepted values and required fields.

Parameter	Details
`model`	`openai/gpt-audio-1.5` — Required model identifier.
`Chat Completions options (gpt-audio-1.5)`	View Accepted Values
`session fields (realtime models)`	View Accepted Values
`response.create overrides`	View Accepted Values
`tools / tool_choice`	View Accepted Values
`provider.event (native Realtime events)`	View Accepted Values

Input and Output Limits

Formats and limits AudioLab enforces on each request.

Limit	Value
Max bytes	25000000
Input formats	wav, mp3
Output formats	wav, mp3, aac, flac, opus, pcm16

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