Model catalogue
StepFun
Step 3.5 Flash
stepfun/step-3.5-flash
Specification
Published by the vendor; the platform bills at the target's declared price.
Step 3.5 Flash
reasoning open weights toolsStepFun stepfun/step-3.5-flash
Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....
- Input $/1M
- $0.10
- Output $/1M
- $0.30
- Context
- 262K
- Max output
- 66K
- Released
- Jan 29, 2026
- Modalities
- text
On this deployment
No routing target resolves to this model yet. Declare one and the router picks it up without retraining.
Not routable here yet
Add a target with metadata.model set to this id.
targets.yamlyaml
# targets.yaml - declare a target that runs Step 3.5 Flash
targets:
- id: step-3-5-flash
kind: llm
name: Step 3.5 Flash
metadata:
model: stepfun/step-3.5-flash # links the target to this catalogue entry
capabilities:
domains: [general]
supports_tools: true
context_window: 262144
cost:
usd_per_1k_tokens: 0.000200Price among StepFun models
Input list price per million tokens; Step 3.5 Flash is the cheapest of 2 listed.
- 1$0.10Step 3.5 Flash
- 2$0.20
More from StepFun
Other models by the same vendor in the catalogue.