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Global

Stepfun

Weights
mixed
Models listed
3
Open-weight heavyReasoning modelsWebsite

Release timeline

Latest 3. Size is context length.

262KStepFun: Step 3.5 FlashJan 29262KStepFun: Step 3.7 FlashMay 281.0MStepFun: Step 5 PreviewOct 8

Models

Stepfun

StepFun: Step 5 Preview

reasoningopen

A chat model that spends extra steps before it answers.

Input
$1 / M
Context
1.0M

Stepfun

StepFun: Step 3.7 Flash

reasoningopen

A chat model that spends extra steps before it answers.

Input
$0.200 / M
Context
262K

Stepfun

StepFun: Step 3.5 Flash

reasoningopen

A chat model that spends extra steps before it answers.

Input
$0.100 / M
Context
262K