StepFun
- Categories
- Model labs
- Owned by
- StepFun (private)
- HQ
- CN
- Website
- https://platform.stepfun.ai
- Pricing page
- https://platform.stepfun.ai/docs/en/guides/pricing/details
- Fee model
- per_token
- Fees
- Per-token with cache-hit input price; TTS per 10k characters; ASR per hour
- Free tier
- no
- OpenAI-compatible API
- yes
- Notes
- Rate limits tiered by cumulative top-up (V0 $0: 5 concurrency, 10 RPM ... V5 $1,500: 10,000 concurrency). stepaudio-3 previews currently free (limited time).
- Sources
- https://platform.stepfun.ai/docs/en/guides/pricing/details collected 2026-09-18
LLM prices (7 models, USD per 1M tokens)
| Model | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| Step 3.5 Flash step-3.5-flash |
$0.10 | $0.30 | $0.02 | 256k | ✓ src |
| Step 3.7 Flash step-3.7-flash |
$0.20 | $1.15 | $0.04 | 256k | ✓ src |
| StepAudio 2.5 ASR stepaudio-2.5-asr |
— | — | — | — | ✓ src |
| StepAudio 2.5 Chat stepaudio-2.5-chat |
$1.50 | $3.50 | $0.30 | — | ✓ src |
| StepAudio 2.5 Realtime stepaudio-2.5-realtime |
$1.50 | $10 | $0.30 | — | ✓ src |
| StepAudio 3 ASR Max stepaudio-3-asr-max |
— | — | — | — | ✓ src |
| StepAudio 3 TTS stepaudio-3-tts |
— | — | — | — | ✓ src |