TAU2
Measured May 29, 2026Source
Score
0.87
Models9 2 
Step 3.5 Flash 2603
StepFunStepFunChina
Step 3.5 Flash is a fast and efficient language model from StepFun, optimized for low-latency responses. It is part of the Flash series, designed to balance speed with strong reasoning capabilities for general-purpose tasks.
FastReasoning
Input / 1M tokens
$0.00Output / 1M tokens
$0.00Output tokens/s
194.97First-token seconds
0.83sSupported plans
8Benchmark history
Evaluations
Terminalbench Hard
Measured May 29, 2026Source
Score
0.33
Lcr
Measured May 29, 2026Source
Score
0.54
Ifbench
Measured May 29, 2026Source
Score
0.67
Scicode
Measured May 29, 2026Source
Score
0.39
Hle
Measured May 29, 2026Source
Score
0.23
Gpqa
Measured May 29, 2026Source
Score
0.83
Artificial Analysis Coding Index
Measured May 29, 2026Source
Score
34.6
Artificial Analysis Intelligence Index
Measured May 29, 2026Source
Score
38.5
Plan availability
Products and plans that support this model
Step Plan
Step Plan
Step Plan is StepFun's subscription-based AI service for Agent and Coding scenarios. It offers standardized APIs with OpenAI and Anthropic compatibility, intelligent multi-model routing via step-router-v1, and out-of-the-box multimodal capabilities including text, speech, and image models. Designed for developers building intelligent workflows with high-frequency model calls.
Step Plan
Step Plan
Step Plan is a subscription-based AI service from StepFun for high-frequency developers, offering access to flagship models via standardized APIs for coding and agent scenarios with intelligent routing and multimodal capabilities.
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