LLM Pricing

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StepFun: Step 3.5 Flash

🇨🇳 階躍星辰 · Step 3.5

Input Price $0.090 per million tokens NT$2.9
Output Price $0.300 per million tokens NT$9.6
Context Window 262K tokens Output limit: 16K
OpenRouter Route Price Please verify with official pricing pages
Use this model via OpenRouter →

Dimension Unit Price (USD) Price (TWD) Effective From
Input per 1M tokens $0.090 NT$2.9 2026-05-21
Output per 1M tokens $0.300 NT$9.6 2026-05-03
Cached Input per 1M tokens $0.020 NT$0.64 2026-05-21

Provider
階躍星辰 (StepFun)
Model Family
Step 3.5
Version String
stepfun/step-3.5-flash
Status
active
Modality
text
Context Window
262,144 tokens
Output Limit
16,384 tokens

Index Metrics

Cross-domain capability indexes evaluated by Artificial Analysis — Artificial Analysis

Agentic Index 52 A Measured: 2026-05-27
Coding Index 32 C Measured: 2026-05-27
Intelligence Index 38 B Measured: 2026-05-27

Benchmark Scores

Data source: Artificial Analysis

AA-LCR 43.0% D Measured: 2026-05-27
GPQA Diamond 83.1% A Measured: 2026-05-27
HLE 19.1% B Measured: 2026-05-27
IFBench 64.6% B Measured: 2026-05-27
Non-Hallucination 14.8% Measured: 2026-05-27
Omniscience Accuracy 23.9% Measured: 2026-05-27
SciCode 40.4% B Measured: 2026-05-27
Tau2 94.4% Measured: 2026-05-27
TerminalBench 27.3% Measured: 2026-05-27

Performance Metrics

Real-world benchmarks, updated every 72 hours by Artificial Analysis — Artificial Analysis

First Token Latency 1.1s Measured: 2026-05-27
Output Speed 202 t/s Measured: 2026-05-27
Response Time 13.4s Measured: 2026-05-27

90-Day Price Trend

Input / Output price (USD per 1M tokens)

Past 90 days of records; every price change is shown here

Date Dimension Price (USD) Source
2026-05-27 Cached Input $0.020 openrouter
2026-05-27 Output $0.300 openrouter
2026-05-27 Input $0.090 openrouter
2026-05-26 Cached Input $0.020 openrouter
2026-05-26 Output $0.300 openrouter
2026-05-26 Input $0.090 openrouter
2026-05-25 Cached Input $0.020 openrouter
2026-05-25 Output $0.300 openrouter
2026-05-25 Input $0.090 openrouter
2026-05-24 Cached Input $0.020 openrouter
2026-05-24 Output $0.300 openrouter
2026-05-24 Input $0.090 openrouter
2026-05-23 Cached Input $0.020 openrouter
2026-05-23 Output $0.300 openrouter
2026-05-23 Input $0.090 openrouter
2026-05-22 Cached Input $0.020 openrouter
2026-05-22 Output $0.300 openrouter
2026-05-22 Input $0.090 openrouter
2026-05-22 Cached Input $0.020 openrouter
2026-05-22 Output $0.300 openrouter
2026-05-22 Input $0.090 openrouter
2026-05-21 Cached Input $0.020 openrouter
2026-05-21 Output $0.300 openrouter
2026-05-21 Input $0.090 openrouter
2026-05-20 Output $0.300 openrouter
2026-05-20 Input $0.100 openrouter
2026-05-19 Output $0.300 openrouter
2026-05-19 Input $0.100 openrouter
2026-05-18 Output $0.300 openrouter
2026-05-18 Input $0.100 openrouter
2026-05-17 Output $0.300 openrouter
2026-05-17 Input $0.100 openrouter
2026-05-16 Output $0.300 openrouter
2026-05-16 Input $0.100 openrouter
2026-05-16 Output $0.300 openrouter
2026-05-16 Input $0.100 openrouter
2026-05-16 Output $0.300 openrouter
2026-05-16 Input $0.100 openrouter
2026-05-16 Output $0.300 openrouter
2026-05-16 Input $0.100 openrouter
2026-05-15 Output $0.300 openrouter
2026-05-15 Input $0.100 openrouter
2026-05-14 Output $0.300 openrouter
2026-05-14 Input $0.100 openrouter
2026-05-13 Output $0.300 openrouter
2026-05-13 Input $0.100 openrouter
2026-05-12 Output $0.300 openrouter
2026-05-12 Input $0.100 openrouter
2026-05-11 Output $0.300 openrouter
2026-05-11 Input $0.100 openrouter

Description

Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....

Key Insights

Key data points from this page for quick reference and citation.

  • StepFun: Step 3.5 Flash Input price: $0.09/M tokens
  • StepFun: Step 3.5 Flash Output price: $0.3/M tokens
  • Context window: 262,144 tokens
  • Provider: StepFun
  • Model family: Step 3.5
  • Modalities: text
  • Data source: OpenRouter, updated daily