StepFun (China)

Step 3.5 Flash

step-3.5-flash

A lightweight model for fast multimodal reasoning and coding assistance.

StepFun flash lane for quick multimodal reasoning and coding assistance

256K context256K context
Released2026-01-29
Relays1 site
reasoningcode generationmultimodalfast

Model information

Model ID
step-3.5-flash
Context
256K
Max input
256K
Max output
256K
Knowledge cutoff
2025-01
Open weights
Supported
License
-
Release date
2026-01-29

Input

Text: SupportedImage: Not supportedAudio: Not supportedVideo: Not supportedPDF: Not supportedFile: Not supported

Output

Text: SupportedImage: Not supportedAudio: Not supportedVideo: Not supported

API capabilities

Reasoning: SupportedTool call: SupportedStructured output: UnknownTemperature: Supported

StepFun (China) Official Pricing

CNY
Updated: 2026-10-04T23:35:59.313+08:00

Input

~¥0.6685/ 1M tokens

Output

~¥2.005/ 1M tokens

Cache read

~¥0.1337/ 1M tokens

Relay Comparison

Compare token, per-request, or per-second pricing by relay channel.

How should Step 3.5 Flash relay pricing be compared?

This Step 3.5 Flash pricing page compares official pricing with public prices from 1 listed AI gateways. Token prices are shown in CNY per 1M tokens, while per-request, per-second, and per-character rows use the unit shown in the table. Last updated: 10/25/2026, 21:14.

Data sources
Public price catalogs, official pricing records, and monitoring results.
Metric definitions
Uptime means successful probe response rate, fake-rate signals possible model mismatch or abnormal output risk, and latency is average API response time.
Risk note
Relay gateways are third-party services. Pricing, billing, privacy, and stability can change; start with a small top-up and verify reliability before continued use.