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StepFun: Step 3.5 Flash

🇨🇳 StepFun · Step 3.5

Input Price $0.100 per million tokens NT$3.2
Output Price $0.300 per million tokens NT$9.6
Context Window 262K tokens Output limit: 66K
OpenRouter Route Price Please verify with official pricing pages
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Overview

StepFun: Step 3.5 Flash is a large language model API from StepFun, part of its Step 3.5 model family. At $0.100 per million input tokens and $0.300 per million output tokens, it sits in the budget tier — among the cheaper options for high-throughput or cost-sensitive workloads. Output tokens cost about 3× as much as input, so prompt-heavy workloads run noticeably cheaper than generation-heavy ones. A large 262K-token context window (≈393 pages of text) lets it take in whole books, large codebases, or lengthy transcripts in a single call. On Artificial Analysis's Intelligence Index it scores 26 (C grade), a useful proxy for its general reasoning strength relative to the other models tracked here. All prices on this page reflect OpenRouter's routed rates and are re-synced automatically every day; confirm against the provider's official pricing before committing to production.

Dimension Unit Price (USD) Price (TWD) Effective From
Input per 1M tokens $0.100 NT$3.2
Output per 1M tokens $0.300 NT$9.6
Cached Input per 1M tokens $0.020 NT$0.64

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
65,536 tokens

Index Metrics

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

Intelligence Index 26 C Measured: 2026-07-01

Benchmark Scores

Data source: Artificial Analysis

AA-LCR 43.0% D Measured: 2026-07-01
GPQA Diamond 83.1% A Measured: 2026-07-01
HLE 19.1% B Measured: 2026-07-01
IFBench 64.6% B Measured: 2026-07-01
Non-Hallucination 14.8% Measured: 2026-07-01
Omniscience Accuracy 23.9% Measured: 2026-07-01
SciCode 40.4% B Measured: 2026-07-01
Tau2 94.4% Measured: 2026-07-01
TerminalBench 27.3% Measured: 2026-07-01

Performance Metrics

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

First Token Latency 1.1s Measured: 2026-07-01
Output Speed 190 t/s Measured: 2026-07-01
Response Time 14.3s Measured: 2026-07-01

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
Output $0.300 OpenRouter
Input $0.100 OpenRouter
Output $0.300 OpenRouter
Input $0.100 OpenRouter
Output $0.300 OpenRouter
Input $0.100 OpenRouter
Cached Input $0.020 OpenRouter
Output $0.300 OpenRouter
Input $0.090 OpenRouter
Cached Input $0.020 OpenRouter
Output $0.300 OpenRouter
Input $0.090 OpenRouter
Cached Input $0.020 OpenRouter
Output $0.300 OpenRouter
Input $0.090 OpenRouter
Cached Input $0.020 OpenRouter
Output $0.300 OpenRouter
Input $0.090 OpenRouter
Cached Input $0.020 OpenRouter
Output $0.300 OpenRouter
Input $0.090 OpenRouter
Cached Input $0.020 OpenRouter
Output $0.300 OpenRouter
Input $0.090 OpenRouter
Cached Input $0.020 OpenRouter
Output $0.300 OpenRouter
Input $0.090 OpenRouter
Cached Input $0.020 OpenRouter
Output $0.300 OpenRouter
Input $0.090 OpenRouter
Cached Input $0.020 OpenRouter
Output $0.300 OpenRouter
Input $0.090 OpenRouter
Cached Input $0.020 OpenRouter
Output $0.300 OpenRouter
Input $0.090 OpenRouter
Cached Input $0.020 OpenRouter
Output $0.300 OpenRouter
Input $0.090 OpenRouter
Cached Input $0.020 OpenRouter
Output $0.300 OpenRouter
Input $0.090 OpenRouter
Cached Input $0.020 OpenRouter
Output $0.300 OpenRouter
Input $0.090 OpenRouter
Cached Input $0.020 OpenRouter
Output $0.300 OpenRouter
Input $0.090 OpenRouter
Cached Input $0.020 OpenRouter
Output $0.300 OpenRouter

Key Insights

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

  • StepFun: Step 3.5 Flash Input price: $0.1/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