Step 3.5 Flash
The spec sheet
Figures as the maker publishes them.
Price
- Input, per 1M tokens
- $0.10
- Output, per 1M tokens
- $0.30
Memory
- Context window
- 262K tokens
- Longest answer
- 66K tokens
Abilities
- Reasoning
- Yes
- Reads images
- No
- Calls tools
- Yes
- Takes in
- text
- Gives back
- text
The model
- Lab
- StepFun
- Model id
- stepfun/step-3.5-flash
- Released
- 29 Jan 2026
- Open weights
- Yes (stepfun-ai/Step-3.5-Flash)
