# Audio API: understanding and speech-to-speech building blocks

> Use verified audio-understanding, ASR, and TTS endpoint modes without treating every speech model as interchangeable.

- Canonical: https://chinaapi.ai/audio-api/
- Updated: 2026-08-08
- Tasks: audio-understanding
- Endpoint: `Model-specific: /v1/chat/completions, /v1/audio/transcriptions, or /v1/audio/speech`
- Inputs: Audio for understanding/transcription, or text for synthesis, using the selected model's exact api_mode.
- Outputs: Text analysis/transcript or generated audio; a direct speech-to-speech result is not implied unless catalog metadata says so.
- Lifecycle: The listed audio endpoints are synchronous; a speech-to-speech workflow chains transcription or audio understanding to a separate TTS request.
- Limits: A TTS or ASR label does not prove direct audio understanding, voice cloning, diarization, or speech-to-speech support.

## Models with matching catalog metadata

### [stepaudio-2-asr-pro](https://chinaapi.ai/models/stepaudio-2-asr-pro/)

- Tasks: video-with-audio, transcription
- Endpoint: `POST https://api.chinaapi.ai/v1/audio/transcriptions`
- Cost example: 1 audio hour × $0.35 = $0.35.

### [step-asr](https://chinaapi.ai/models/step-asr/)

- Tasks: video-with-audio, transcription
- Endpoint: `POST https://api.chinaapi.ai/v1/audio/transcriptions`
- Cost example: 1 audio hour × $0.15 = $0.15.

### [step-asr-1.1](https://chinaapi.ai/models/step-asr-1.1/)

- Tasks: video-with-audio, transcription
- Endpoint: `POST https://api.chinaapi.ai/v1/audio/transcriptions`
- Cost example: 1 audio hour × $0.35 = $0.35.

### [mimo-v2.5-asr](https://chinaapi.ai/models/mimo-v2.5-asr/)

- Tasks: video-with-audio, transcription
- Endpoint: `POST https://api.chinaapi.ai/v1/chat/completions`
- Cost example: 1 audio hour × $0.074 = $0.074.

### [mimo-v2.5-tts](https://chinaapi.ai/models/mimo-v2.5-tts/)

- Tasks: video-with-audio, text-to-speech
- Endpoint: `POST https://api.chinaapi.ai/v1/chat/completions`
- Cost example: 1 10k characters × $0 = $0.

### [stepaudio-2.5-tts](https://chinaapi.ai/models/stepaudio-2.5-tts/)

- Tasks: video-with-audio, text-to-speech
- Endpoint: `POST https://api.chinaapi.ai/v1/audio/speech`
- Cost example: 1 10k characters × $0.85 = $0.85.

### [glm-tts](https://chinaapi.ai/models/glm-tts/)

- Tasks: video-with-audio, text-to-speech
- Endpoint: `POST https://api.chinaapi.ai/v1/audio/speech`
- Cost example: 1 10k characters × $0.307692 = $0.307692.

### [qwen3-asr-flash](https://chinaapi.ai/models/qwen3-asr-flash/)

- Tasks: video-with-audio, transcription
- Endpoint: `POST https://api.chinaapi.ai/v1/audio/transcriptions`
- Cost example: 1 audio hour × $0.123539 = $0.123539.

### [qwen3-tts-flash](https://chinaapi.ai/models/qwen3-tts-flash/)

- Tasks: video-with-audio, text-to-speech
- Endpoint: `POST https://api.chinaapi.ai/v1/audio/speech`
- Cost example: 1 10k characters × $0.123077 = $0.123077.

### [speech-2.8-hd](https://chinaapi.ai/models/speech-2.8-hd/)

- Tasks: video-with-audio, text-to-speech
- Endpoint: `POST https://api.chinaapi.ai/v1/audio/speech`
- Cost example: 1 10k characters × $0.538462 = $0.538462.

### [speech-2.8-turbo](https://chinaapi.ai/models/speech-2.8-turbo/)

- Tasks: video-with-audio, text-to-speech
- Endpoint: `POST https://api.chinaapi.ai/v1/audio/speech`
- Cost example: 1 10k characters × $0.307692 = $0.307692.

### [step-tts-2](https://chinaapi.ai/models/step-tts-2/)

- Tasks: video-with-audio, text-to-speech
- Endpoint: `POST https://api.chinaapi.ai/v1/audio/speech`
- Cost example: 1 10k characters × $0.4 = $0.4.

### [step-tts-mini](https://chinaapi.ai/models/step-tts-mini/)

- Tasks: video-with-audio, text-to-speech
- Endpoint: `POST https://api.chinaapi.ai/v1/audio/speech`
- Cost example: 1 10k characters × $0.15 = $0.15.

### [stepaudio-2.5-asr](https://chinaapi.ai/models/stepaudio-2.5-asr/)

- Tasks: video-with-audio, transcription
- Endpoint: `POST https://api.chinaapi.ai/v1/audio/transcriptions`
- Cost example: 1 audio hour × $0.022 = $0.022.

Displayed prices are generated from `scripts/models-data.json`, synchronized against the ChinaAPI gateway. Media service margin, if any, is included in the displayed USD rate and is not added separately.

Source: https://chinaapi.ai/data/model-pricing/ · updated 2026-08-08.