# StepFun: Step 3.5 Flash

Provider: stepfun  
Category: llm  
Model ID: `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....

## Specs

- Context length: 262144 tokens
- Max output: 65536 tokens
- Modalities: text
- Released: 2026-01-29

## Pricing

- Input: $0.10 per million tokens
- Output: $0.30 per million tokens

## Providers

- **stepfun** — ctx 262144, input $0.10/M, output $0.30/M

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Last verified: 2026-04-23T23:46:29.618Z  
Canonical URL: https://switchy.build/models/step-3-5-flash