321B MoE multimodal reasoning model (38B active); API model step-3 retired 2026-07-08.
Released
Jul 31, 2025
Context window
65.5K tokens
Max output
Not disclosed
Parameters
321B 38B active
Input price
Not disclosed
Output price
Not disclosed
Prices are first-party list prices in USD at the standard tier. Last verified Oct 30, 2026.
Pricing
No list price recorded for this model yet.
Specifications
- Developer
- StepFun
- Model type
- Multimodal
- Architecture
- MoE
- Parameters
- 321B (38B active)
- Input
- Text Image
- Output
- Text
- Knowledge cutoff
- Not disclosed
- License
- Apache License 2.0
- API access
- First-party API
- End of life
- Jul 8, 2026
- Capabilities
- Reasoning Vision