stepfun

Access 2 stepfun models on OpenRouter including Step 3.5 Flash and Step 3.5 Flash (free). Compare pricing, context windows, and capabilities.

stepfun tokens processed on OpenRouter

StepFun: Step 3.5 FlashStep 3.5 Flash
54.4B tokens
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. It is a reasoning model that is incredibly speed efficient even at long contexts.
by stepfunJan 29, 2026256K context$0.10/M input tokens$0.30/M output

stepfun

Access 2 stepfun models on OpenRouter including Step 3.5 Flash and Step 3.5 Flash (free). Compare pricing, context windows, and capabilities.

stepfun tokens processed on OpenRouter

StepFun: Step 3.5 FlashStep 3.5 Flash
54.4B tokens
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. It is a reasoning model that is incredibly speed efficient even at long contexts.
by stepfunJan 29, 2026256K context$0.10/M input tokens$0.30/M output

tokens

StepFun: Step 3.5 Flash (free)Step 3.5 Flash (free)

1.63T tokens

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. It is a reasoning model that is incredibly speed efficient even at long contexts.

by stepfunJan 29, 2026256K context$0/M input tokens$0/M output tokens