Step 3.5 Flash

Step 3.5 Flash is a fast-response language model optimized for Chinese language understanding and generation. It is designed for quick inference and efficient performance in conversational and text-based tasks.

FastReasoningCoding

Input / 1M tokens

$0.10

Output / 1M tokens

$0.30

Output tokens/s

186.71

First-token seconds

0.82s

Supported plans

Benchmark history

Evaluations

TAU2

Measured Jul 10, 2026Source

Score

0.94

Terminalbench Hard

Measured Jul 10, 2026Source

Score

0.27

Lcr

Measured Jul 10, 2026Source

Score

0.43

Ifbench

Measured Jul 10, 2026Source

Score

0.65

Scicode

Measured Jul 10, 2026Source

Score

0.4

Hle

Measured Jul 10, 2026Source

Score

0.19

Gpqa

Measured Jul 10, 2026Source

Score

0.83

Artificial Analysis Intelligence Index

Measured Jul 10, 2026Source

Score

25.5

Plan availability

Products and plans that support this model

Command Code AI

Command Code AI is a frontier AI coding agent that runs in the terminal and continuously learns your coding taste. It supports multiple premium and open-source models, providing code generation, bug fixing, testing, and refactoring with personalized style preferences. Starts at $1/month.

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 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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