// StepFun (阶跃星辰)
Step-5-Preview
A StepFun (阶跃星辰) model. 2 prices across 2 channels side by side, each with its source and check date – plus specs, licence, speed and benchmarks.
- Official in/out per 1M
- ¥7 / ¥20
- Lowest (official)
- ¥7 / ¥20
- Context
- 1M
- AA index
- 43.7
Prices checked 2026-10-19Official sources linked on every rowNo estimates
01Specs at a glance
Official values first; gaps filled from OpenRouter’s API where the vendor page is silent.
| Vendor | StepFun (阶跃星辰) |
|---|---|
| Context window | 1M (1,000,000 tokens) |
| Max output | 64K |
| Input | Text · Image · Video |
| Output | Text |
| Tool calling / JSON | Yes / Yes |
| Weights & licence | Closed · Proprietary (API only) |
| Released | Oct 8, 2026 (OpenRouter listing date) |
| Model IDs | step-5-preview · step-5-preview@bailian |
02Prices on 2 channels
Per 1M tokens, in the currency each source publishes (1 USD = 6.7 CNY for the blended column). Sorted: official first, then cheapest.
| Channel | Source | Input | Output | Cache hit | Blended $ | Context | Notes |
|---|---|---|---|---|---|---|---|
| Official Vendor’s China site, billed in CNY | Official 10-19 | ¥7 | ¥20 | ¥0.7 | 1.53 | 1M | Cache-hit input raised 0.35→0.70 CNY/M from 2026-10-14 00:30 (Beijing); users who had already called Step 5 Preview via pay-as-you-go API before then keep 0.35 (StepFun price-adjustment notice). |
| 阿里云百炼 Inference platform (own price page) | Platform 10-10 | ¥7 | ¥20 | — | 1.53 | — | Third-party model hosted on 阿里云百炼 (Beijing) |
“Official” = vendor pricing page; “Platform” = the platform’s own pricing page; “OpenRouter” = price listed on OpenRouter, not checked on the platform’s site. Click a source tag to open the original page.
03Where you can use it
Derived only from the price sources above. Country restrictions are set by each vendor – check their terms before you sign up.
- Vendor’s China site, billed in CNY
Official - Inference platform (own price page)
阿里云百炼
04Performance
Speed and AA index from Artificial Analysis public leaderboards (not our own tests); benchmark scores from our benchmark library, best result per benchmark.
- AA indexStep 5 Preview
- 43.7
- Output speed (median)
- 92 tok/s
- Time to first token
- 1.89s
- AA index per $ (blended)
- 28.59
| Benchmark | Best score | Source | Date |
|---|---|---|---|
| LMArena Text | 1447 | official | 2026-10-08 |
| LMArena WebDev | 1564 | official | 2026-10-08 |
| LMArena Vision | 1260 | official | 2026-10-02 |
05Price changes we recorded
All price changes →From our daily re-checks of the sources above.
- 2026-10-19 · official · cache read0.35 → 0.7 CNY (+100%)
06More from StepFun (阶跃星辰)
FAQ
How much does the Step-5-Preview API cost?
On the official pricing page: ¥7 / ¥20 per 1M input / output tokens, cached input ¥0.7 (checked 2026-10-19).
What is the context window of Step-5-Preview?
1M tokens of context, up to 64K output tokens. Platforms may cap it lower – see the table.
Is Step-5-Preview open source?
No. It is only available through APIs and the vendor’s apps.