StepFun: Step 3.7 Flash

Video input Image input Text input Text output Unavailable
Author's Description

Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model. It pairs a 196B-parameter language backbone with a vision encoder for native image and video understanding, activating roughly 11B parameters...

Key Specifications
Cost
$$
Context
256K
Parameters
196B (Rumoured)
Released
May 28, 2026
Speed
Ability
Reliability
Supported Parameters

This model supports the following parameters:

Response Format Include Reasoning Temperature Top Logprobs Tools Max Tokens Reasoning Stop Frequency Penalty Logprobs Structured Outputs Top P
Features

This model supports the following features:

Structured Outputs Reasoning Tools Response Format
Performance Summary

Step 3.7 Flash, StepFun's 196B-parameter multimodal Mixture-of-Experts model, demonstrates exceptional performance across several key metrics. It consistently ranks among the fastest models available, achieving an Infinityth percentile in speed across eight benchmarks. Furthermore, its pricing is highly competitive, placing it in the 86th percentile across six benchmarks. The model exhibits outstanding reliability with a 98% success rate, indicating minimal technical failures. Analysis of benchmark results reveals significant strengths in several areas. Step 3.7 Flash achieved perfect accuracy in General Knowledge, Email Classification, Reasoning, Ethics, and Mathematics, often being the most accurate model at its price point and speed. Notably, it was the #1 model in accuracy for Mathematics, showcasing an excellent accuracy-to-cost ratio. Its Coding performance is solid at 85.7% accuracy. However, the model exhibits critical weaknesses in Hallucinations and Instruction Following, scoring 0.0% accuracy in both. This indicates a significant challenge in acknowledging uncertainty and precisely adhering to complex instructions.

Model Pricing

Current Pricing

Feature Price (per 1M tokens)
Prompt $0.2
Completion $1.15
Input Cache Read $0.04

Price History

Available Endpoints
Provider Endpoint Name Context Length Pricing (Input) Pricing (Output)
StepFun
StepFun | stepfun/step-3.7-flash-20260528 256K $0.2 / 1M tokens $1.15 / 1M tokens
Benchmark Results
Benchmark Category Reasoning Strategy Free Executions Accuracy Cost Duration
Other Models by stepfun