# StepFun: stepaudio-2.5-chat — API on ChinaAPI

> StepFun StepAudio 2.5 Chat — end-to-end speech understanding that takes audio or text in and returns text, reading paralinguistic signal such as hesitation and laughter from the waveform itself rather than from a transcript. Supports persona customization across character, speech habits, and emotional range; audio is supplied as input_audio content parts on chat completions. For spoken replies use a TTS model.

- Canonical page: https://chinaapi.ai/models/stepaudio-2.5-chat/
- Model ID: `stepaudio-2.5-chat`
- Context window: 
- Modalities: Text
- Pricing: $1.5/M input, $3.5/M output tokens (USD)
- Endpoint: OpenAI-compatible `POST https://api.chinaapi.ai/v1/chat/completions`
- Pricing basis: Token-model rates are synchronized from the gateway and may follow providers' official China list prices where configured. Live pricing is authoritative.
- Access: no mainland-China account or phone number required; $2 free trial credit
- Sign up: https://dash.chinaapi.ai/register?lang=en&utm_source=chinaapi&utm_medium=model-md&utm_campaign=stepaudio-2.5-chat

## Quickstart

```
curl -X POST https://api.chinaapi.ai/v1/chat/completions \
  -H "Authorization: Bearer $CHINAAPI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "stepaudio-2.5-chat",
    "messages": [
      {"role": "user", "content": "Summarize the main tradeoffs for this API workload."}
    ]
  }'

import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["CHINAAPI_API_KEY"],
    base_url="https://api.chinaapi.ai/v1",
)

response = client.chat.completions.create(
    model="stepaudio-2.5-chat",
    messages=[
        {"role": "user", "content": "Summarize the main tradeoffs for this API workload."}
    ],
)
print(response.choices[0].message.content)
```

## FAQ

**How do I use stepaudio-2.5-chat?**
Use stepaudio-2.5-chat through ChinaAPI with an API key and the OpenAI-compatible endpoint shown on this page.

**How much does stepaudio-2.5-chat cost?**
stepaudio-2.5-chat is $1.5/M input, $3.5/M output tokens, paid in USD. The live pricing page is authoritative. Token-model rates are synchronized from the gateway and may follow providers' official China list prices where configured. Live pricing is authoritative.

**Does stepaudio-2.5-chat need a Chinese account?**
No. ChinaAPI provides access without a mainland-China account or phone number and includes a $2 free trial. Check live pricing for the displayed USD rate.

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Markdown twin of https://chinaapi.ai/models/stepaudio-2.5-chat/ — generated by scripts/gen_model_pages.py. Full catalog: https://chinaapi.ai/llms-full.txt