StepFun
15 models across 2 families · Latest: Step 5 Preview (2026-09)
One of China's leading AI 'Six Tigers'.
StepFun's portfolio covers 14 active models across 2 current families, spanning coding, rag, and agents. Open a model detail page to compare provider routes and sourced benchmarks.
Covers 6 workload areas across 14 active tracked models; last verified 2026-10-17.
Use it for
- Teams evaluating coding, rag, and agents across this lab's releases
- Comparing model families before committing to a flagship
- Migration and pricing follow-ups across 14 tracked models
Do not use it for
- Choosing a hosting provider without opening a model page for price ladders
Active models
14
Current models from this lab, excluding deprecated ones
Active families
2
Current model families from this lab
Open catalog
1 open
0 open source / 1 open weights
Lowest output price
$0.300 /1M
Cheapest tracked output across active models, per 1M tokens
Latest dated release
2026-09-20
Step 5 Preview
Freshness
2026-10-17
Researched 10d ago
Information
Release cadence
- Dated releases
- 5
- Latest model
- Step 5 Preview
- Latest date
- 2026-09-20
Where this lab wins
- Coding: 2 tracked models with SWE-bench / HumanEval-style scores.
- RAG: 3 tracked models with ruler / needle retrieval benchmarks.
- Agentic: 4 tracked models with BFCL, tau-bench, and SWE-bench tool-use coverage.
- Long-context: 7 tracked models with context-token or InfiniteBench-class signal.
Flagship quality / price signal
- Flagship
- Step 3.5 Flash
- Selection source
- Best sourced coding Q/$
- Coding grade
- B
- Benchmark / output price
- swe-bench-verified 74.4 · $0.300/1M
About
StepFun (阶跃星辰) is a Chinese AI startup founded in April 2023 that develops large-scale foundation models for text generation, multimodal understanding, audio processing, and agentic tool use. The company has released Step-1 and Step-2 models, StepAudio models, and open-weight Flash models including Step 3.5 Flash and Step 3.7 Flash.
Featured models
| Model | Released | Context | Input price ($/1M) | Output price ($/1M) | License | Openness |
|---|---|---|---|---|---|---|
| Step 5 Preview | 2026-09-20 | 1M | $1.00 | $2.70 | StepFun Model License 1.0 | Open weights |
| Step 3.7 Flash | 2026-05-29 | 256K | $0.20 | $1.15 | Proprietary | Proprietary |
| StepAudio 2.5 Realtime | 2026-05-24 | - | - | - | Proprietary | Proprietary |
Model families
Recent releases
- Step 5 Preview- 2026-09-20
- Step 3.7 Flash- 2026-05-29
- StepAudio 2.5 Realtime- 2026-05-24
- StepAudio 2.5 ASR- 2026-05-22
- StepAudio 2.5 TTS- 2026-04-16
Top comparisons
Explore related pages
Last reviewed: 2026-10-17. Data sourced from public lab announcements and provider documentation.