This model is deprecated. We only continue performance benchmarking for the default 10k input token workload. Results for other workloads are historical and no longer updated.

StepFun has launched a newer model, Step 3.5 Flash 2603. We suggest considering it instead.

For more information, see comparison of Step 3.5 Flash 2603 to other models and API provider benchmarks for Step 3.5 Flash 2603.

Open weights model

Released 2026年2月

Step 3.5 Flash API 服务商基准测试与分析

模型比较

本分析旨在帮助你根据使用场景,选择 Step 3.5 Flash 的最佳 API 服务商。

速度最快

#1
StepFunStepFun
146.1 t/s
#2
SiliconFlow (FP8)SiliconFlow (FP8)
79.0 t/s

输出速度

共 2 家服务商

延迟最低

#1
StepFunStepFun
17.12 s
#2
SiliconFlow (FP8)SiliconFlow (FP8)
27.06 s

首个答案 Token 延迟

共 2 家服务商

价格最低

#1
StepFunStepFun
$0.12
#2
SiliconFlow (FP8)SiliconFlow (FP8)
$0.12

每 100 万 token 的混合价格

共 2 家服务商

可通过 2 家 API 服务商使用 Step 3.5 Flash,每家服务商的性能特征和价格各不相同。下方对比了各服务商的关键指标。

  • 输出速度最快的服务商是 StepFun(146.1 t/s)和SiliconFlow (FP8)(79.0 t/s)。
  • 延迟方面,StepFun(17.12 秒)和SiliconFlow (FP8)(27.06 秒) 的首个答案 Token 延迟最低。
  • 价格方面,StepFun(0.12)和SiliconFlow (FP8)(0.12) 每 100 万 token 的混合价格最低。
  • StepFun 的综合表现最突出,在速度、延迟和价格三项指标中均排名第一。

亮点

Output tokens per second · Higher is better
Seconds · Lower is better
USD per 1M tokens (blended) · Lower is better

价格

Pricing: Cache Hit, Input, and Output

Price (USD per M Tokens) · Lower is better · 10,000 input tokens

Pricing: Blended Price

Blended at 7:2:1 (cache-input-output) · USD per 1M tokens (blended) · Lower is better

Output Speed vs. Price

Blended at 7:2:1 (cache-input-output) · Output speed: output tokens per second · USD per 1M tokens (blended)
Most attractive quadrant

速度

按输出速度(每秒 token 数)衡量

Output Speed: Step 3.5 Flash

Output speed: output tokens per second · 10,000 input tokens

Latency vs. Output Speed

Latency: seconds to first token received · Output speed: output tokens per second · 10,000 input tokens
Most attractive quadrant
Pareto line

延迟

按首 Token 延迟(秒)衡量

首个答案 Token 延迟

Seconds to first token received · Lower is better · 10,000 input tokens

端到端响应时间

Seconds to output 500 tokens, calculated based on time to first token, 'thinking' time for reasoning models, and output speed

端到端响应时间

Seconds to output 500 tokens, including reasoning model 'thinking' time · Lower is better · 10,000 input tokens

关键比较指标与 API 功能

StepFun 标志StepFun
256k
开放
--
148
3.43
20.29
13.49
SiliconFlow 标志SiliconFlow
262k
开放
--
79
1.76
33.40
25.31

常见问题

关于 Step 3.5 Flash 服务商的常见问题