Step3 Check detailed information and pricing for AI models
Context Length 65,536 tokens, stepfun-ai from provided
65,536
Context Tokens
$0.57
Prompt Price
$1.42
Output Price
5/16
Feature Support
Model Overview
Step3 is a cutting-edge multimodal reasoning model—built on a Mixture-of-Experts architecture with 321B total parameters and 38B active. It is designed end-to-end to minimize decoding costs while delivering top-tier performance in vision–language reasoning. Through the co-design of Multi-Matrix Factorization Attention (MFA) and Attention-FFN Disaggregation (AFD), Step3 maintains exceptional efficiency across both flagship and low-end accelerators.
Basic Information
Developer
stepfun-ai
Model Series
Other
Release Date
2025-08-28
Context Length
65,536 tokens
Max Completion Tokens
65,536 tokens
Variant
standard
Pricing Information
Prompt Tokens
$0.57 / 1M tokens
Completion Tokens
$1.42 / 1M tokens
Supported Features
Supported (5)
Image Input
Top K
Frequency Penalty
Tool Usage
Reasoning
Unsupported (11)
Seed
Presence Penalty
Repetition Penalty
Response Format
Min P
Logit Bias
Logprobs
Top Logprobs
Structured Outputs
Web Search Options
Top A