StepFun: Step 5 Preview

STEPFUN Developer Architecture Profile

OpenRouter ↗HuggingFace ↗

Intelligence (ELO)1415Chatbot Arena Verified

Max Context Limit1,000,000Max Out: 64,000 tokens

Prompt Caching95% OFF$0.05 / 1M cached

Standard API / 1M$3.70Blended Standard Rate

Model Capabilities & Contract SLAs

Coding & Logic
Fictional

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...

Granular Pricing Matrix

Input Tokens (Standard Prompt)$1.00 / 1M

⚡ Cached Input (Prompt Cache Read)95% OFF$0.05 / 1M

Output Tokens (Completion)$2.70 / 1M

Pricing data via OpenRouter. Sync: 10/8/2026

Evaluate Competitors

VS Engine MatchupStepFun: Step 5 Preview vs Google: Nano Banana 2.1 VS Engine MatchupStepFun: Step 5 Preview vs Mistral: Mistral Large 4 VS Engine MatchupStepFun: Step 5 Preview vs MiniMax: MiniMax M3 VS Engine MatchupStepFun: Step 5 Preview vs SpaceXAI: Grok Build 0.1 VS Engine MatchupStepFun: Step 5 Preview vs Perceptron: Perceptron Mk1 VS Engine MatchupStepFun: Step 5 Preview vs Inception: Mercury 2