Login
StepFunReasoningReasoningActive

StepFun: Step 5 Preview

Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...

Image
Start with this modelBrowse all models
Specification
Model ID
stepfun/step-5-preview
Weight license
Not verified; consult the exact publisher model card
Modality
Text+image+video >text
Context
1M tokens
Input
$1.00/1M
Output
$2.70/1M
Updated
Nov 14, 2026
Scores
Capabilities
  • Supports tool calling
  • Supports vision inputs
  • Supports long-context workflows
  • Supports deeper reasoning tasks

Input and output

Accepts Text, Image, Video inputs. Returns Text outputs.

Supported parameters

frequency_penaltyinclude_reasoninglogprobsmax_tokensmin_ppresence_penaltyreasoningreasoning_effortrepetition_penaltyresponse_formatseedstopstructured_outputstemperaturetool_choicetoolstop_ktop_logprobstop_p

Related models

InclusionAI

inclusionAI: Ling 3.2 Flash (free)

Ling 3.2 Flash is a hybrid reasoning model from inclusionAI that accepts text and image input, with a 1M-token context window and up to 200 images per request. Thinking can...

Google

Google: Gemini 4 Hydrogen

Gemini 4 Hydrogen is the high-efficiency workhorse model of the Gemini 4 family from Google, built for high-throughput agentic workflows, coding and multi-model routing at lower cost and latency than...

Google

Google: Gemini 4 Hydrogen (batch)

Gemini 4 Hydrogen is the high-efficiency workhorse model of the Gemini 4 family from Google, built for high-throughput agentic workflows, coding and multi-model routing at lower cost and latency than...

Build with StepFun: Step 5 Preview

Describe what you want to make and pick this model in the composer. A database and hosting are included.

Start with this model