# Apertis Changelog: 2.2.57 — System Update

Canonical page: https://apertis.ai/changelog/2.2.57
Markdown mirror: https://apertis.ai/changelog/2.2.57.md
Version: 2.2.57
Title: System Update
Published: 2026-05-05
Category: feature

Audio APIs Now Live

## Details

## Full Audio API Support

  Apertis now supports the OpenAI-compatible Audio API. Use a single
  API key to access leading TTS (text-to-speech) and STT
  (speech-to-text) models across providers.

  ### Supported Models

  **Text-to-Speech (TTS)**
  - `gemini-3.1-flash-tts-preview` — Google's latest Flash TTS preview
  - `gpt-4o-mini-tts` — OpenAI's lightweight real-time speech synthesis

  **Speech-to-Text (STT)**
  - `gpt-4o-transcribe` — Flagship high-accuracy transcription
  - `gpt-4o-mini-transcribe` — Cost-efficient real-time transcription
  - `whisper-large-v3-turbo` — Accelerated Whisper v3
  - `whisper-large-v3` — Full-precision Whisper
  - `whisper-1` — The classic, battle-tested baseline

  ### Endpoints

  Drop-in compatible with the OpenAI SDK — no code changes required:

  - `POST /v1/audio/speech` — text → audio
  - `POST /v1/audio/transcriptions` — audio → text
  - `POST /v1/audio/translations` — audio → translated text

  ### Billing

  - **PAYG (pay-as-you-go)**: shares the same quota balance as chat/completions
  - **Per-dimension billing**: priced separately on input tokens / output
    tokens / audio seconds, with admin-tunable AudioRatio
  - **File limit**: 25 MB per multipart upload
  - **Subscriptions**: audio models are PAYG-only for now (not included
    in subscription plans)

  ### Example

  ```python
  from openai import OpenAI

  client = OpenAI(
      api_key="sk-your-apertis-key",
      base_url="https://api.apertis.ai/v1"
  )

  # TTS
  speech = client.audio.speech.create(
      model="gpt-4o-mini-tts",
      voice="alloy",
      input="Hello from Apertis."
  )
  speech.stream_to_file("hello.mp3")

  # STT
  with open("audio.mp3", "rb") as f:
      transcript = client.audio.transcriptions.create(
          model="whisper-large-v3-turbo",
          file=f
      )
  print(transcript.text)
```
### Model Detail Page Updates
  - Endpoint and code samples auto-switch based on the model's task
  - TTS models now emit ready-to-run OpenAI SDK Python snippets
  - Web Search pricing column hidden for voice models (:web is unsupported)