OpenRouter
Catalog quote- Input
- $0.10
- Output
- $0.30
stepfunListed Jan 29, 2026
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....
Context window262.1K
Max output65.5K
Provider endpoints4
Benchmark results0
Measured performance
All leaderboards ↗Benchmark results
No published results in this index yet
Scores appear here when an evaluation matches this exact model.
Access & cost
4 quotesPrices across providers
Your token mix
USD · listed token ratesfeatherless-ai
via Hugging Face- Input
- —
- Output
- —
deepinfra
via Hugging Face- Input
- $0.10
- Output
- $0.30
- Input
- $0.10
- Output
- $0.30
Model specifications
- Developer
- stepfun
- Modality
- Language
- Context
- 262,144 tokens
- Maximum output
- 65,536 tokens
- Weights
- Open weights
- Provider listed
- Jan 29, 2026
- First discovered
- Oct 16, 2026
Exact identities
- openrouter
stepfun/step-3.5-flash - huggingface
stepfun-ai/Step-3.5-Flash
Sources
Updated Oct 18, 2026
More from stepfun
View all ↗stepfunListed May 23
StepFun: Step 3.7 Flash
Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model. It pairs a 196B-parameter language backbone with a vision encoder for native image and video understanding, activating…
262.1K contextImage inputVideo inputNo reported score
No reported score