StepFunLanguage modelPreviewOpen weights
Step 5 Preview
StepFun language model (preview).
Overall Intelligence
#29
of 68
36.2 pts behind #1
0
races led
0
weeks at #1
53.1
score
- Released
- Sep 18, 2026
- 1 mo ago
- Context
- 1.05M
- 64K max output
- Price
- $1 / $2.7
- per 1M in/out · $1.43 blended · OpenRouter
- Speed
- 220 tok/s
- 0.96s to first token (AA)
- Modalities
- text · image · video
- outputs text
- Weights
- Open
- self-hostable
The 30-second version
StepFun language model (preview).
Key takeaways
- 1StepFun language model (preview).
Where it ranks
Latest real results · click any race to watch it
Step 5Best on each axis
Overall
Coding
Hard Reasoning
Writing & Language
Overall Intelligence over time
#1 frontierStep 5Spark 1.23.5 Flash
Update history
The distilled version first; open any release for the deeper breakdown.