StepFun：模型智能、性能与价格

StepFun
StepFun

分析 StepFun 各模型的关键指标，包括质量、价格、输出速度、延迟、上下文窗口等。 本分析旨在帮助你根据使用场景，选择 StepFun 提供的最佳模型。

最智能

#1
Step 3.7 Flash
Step 3.7 Flash
30
#2
Step 3.5 Flash 2603
Step 3.5 Flash 2603
26
#3
Step 3.5 Flash
Step 3.5 Flash
26

Intelligence Index

共 3 个模型

速度最快

#1
Step 3.7 Flash
Step 3.7 Flash
364 t/s
#2
Step 3.5 Flash
Step 3.5 Flash
149 t/s
#3
Step 3.5 Flash 2603
Step 3.5 Flash 2603
144 t/s

输出速度

共 3 个模型

价格最低

#1
Step 3.5 Flash 2603
Step 3.5 Flash 2603
$0.06
#2
Step 3.5 Flash
Step 3.5 Flash
$0.12
#3
Step 3.7 Flash
Step 3.7 Flash
$0.18

每 100 万 token 的混合价格

共 3 个模型

表示推理模型

StepFun 提供 3 个模型，每个模型的智能、性能和价格特征各不相同。 下方对比了各模型的关键指标。

  • 智能方面，StepFun 上表现最好的模型是 Step 3.7 Flash（30）、Step 3.5 Flash 2603（26）和Step 3.5 Flash（26）。
  • 输出速度方面，最快的模型是 Step 3.7 Flash（364 t/s）、Step 3.5 Flash（149 t/s）和Step 3.5 Flash 2603（144 t/s）。
  • 延迟方面，Step 3.7 Flash（6.41 秒）、Step 3.5 Flash（14.50 秒）和Step 3.5 Flash 2603（14.89 秒） 的首个答案 Token 延迟最低。
  • 价格方面，Step 3.5 Flash 2603（$0.06）、Step 3.5 Flash（$0.12）和Step 3.7 Flash（$0.18） 每 100 万 token 的混合价格最低。
  • 上下文窗口方面，Step 3.7 Flash（256k）、Step 3.5 Flash 2603（256k）和Step 3.5 Flash（256k） 支持 StepFun 上最大的上下文窗口。
  • Step 3.7 Flash 在智能与速度之间取得了最佳平衡。若要优化成本，Step 3.5 Flash 2603 的价格最具竞争力。

亮点

智能

Artificial Analysis Intelligence Index · Higher is better

速度

Output tokens per second · Higher is better

价格

USD per 1M tokens (blended) · Lower is better

智能评测

Artificial Analysis Intelligence Index

Artificial Analysis Intelligence Index v4.1 incorporates 9 evaluations: GDPval-AA v2, 𝜏³-Banking, Terminal-Bench v2.1, SciCode, Humanity's Last Exam, GPQA Diamond, CritPt, AA-Omniscience, AA-LCR
Estimate (independent evaluation forthcoming)
Reasoning models are indicated by a lightbulb icon

Artificial Analysis Intelligence Index v4.1 includes: GDPval-AA v2, 𝜏³-Banking, Terminal-Bench v2.1, SciCode, Humanity's Last Exam, GPQA Diamond, CritPt, AA-Omniscience, AA-LCR. See Intelligence Index methodology for further details, including a breakdown of each evaluation and how we run them.

Intelligence Evaluations

Intelligence evaluations measured independently by Artificial Analysis · Higher is better
GDPval-AA v2

Agentic real-world work tasks, (Elo-500)/2000

𝜏³-Banking

Agentic tool use

Terminal-Bench v2.1

Agentic coding & terminal use

SciCode

Coding

Humanity's Last Exam

Reasoning & knowledge

GPQA Diamond

Scientific reasoning

CritPt

Physics reasoning

AA-Omniscience Accuracy

Knowledge

AA-Omniscience Non-Hallucination Rate

1 - hallucination rate

AA-LCR

Long context reasoning

AA-Briefcase

Agentic knowledge work, Elo

No data available
AutomationBench-AA

Agentic SaaS workflows

Harvey LAB-AA

Legal agentic work, criterion pass rate

EnterpriseOps-Gym-AANew

Agentic business operations

IFBench

Instruction following

APEX-Agents-AA

Long-horizon agentic tasks

ITBench-AA

Kubernetes incident root-cause analysis

MMMU-Pro

Visual reasoning

Reasoning models are indicated by a lightbulb icon

While model intelligence generally translates across use cases, specific evaluations may be more relevant for certain use cases.

Artificial Analysis Intelligence Index v4.1 includes: GDPval-AA v2, 𝜏³-Banking, Terminal-Bench v2.1, SciCode, Humanity's Last Exam, GPQA Diamond, CritPt, AA-Omniscience, AA-LCR. See Intelligence Index methodology for further details, including a breakdown of each evaluation and how we run them.

Intelligence Index vs. Price

Blended at 7:2:1 (cache-input-output) · USD per 1M tokens (blended)
Most attractive quadrant
Pareto line
Reasoning models are indicated by a lightbulb icon

While higher intelligence models are typically more expensive, they do not all follow the same price-quality curve.

上下文窗口

Context Window

Context window: tokens limit · Higher is better
Reasoning models are indicated by a lightbulb icon

Larger context windows are relevant to RAG (Retrieval Augmented Generation) LLM workflows which typically involve reasoning and information retrieval of large amounts of data.

Maximum number of combined input & output tokens. Output tokens commonly have a significantly lower limit (varied by model).

价格

Intelligence Index vs. Price

Blended at 7:2:1 (cache-input-output) · USD per 1M tokens (blended)
Most attractive quadrant
Pareto line
Reasoning models are indicated by a lightbulb icon

While higher intelligence models are typically more expensive, they do not all follow the same price-quality curve.

性能摘要

Output Speed vs. Price

Output speed: output tokens per second · USD per 1M tokens (blended)
Most attractive quadrant
Pareto line
Reasoning models are indicated by a lightbulb icon

Tokens per second received while the model is generating tokens (ie. after first chunk has been received from the API for models which support streaming).

Price per token, shown in USD per million tokens. Price is a blend of cache hit, input, and output token prices using the selected ratio (default 7:2:1 cache-input-output).

速度

按输出速度（每秒 token 数）衡量

Output Speed

Output tokens per second · Higher is better
Reasoning models are indicated by a lightbulb icon

Tokens per second received while the model is generating tokens (ie. after first chunk has been received from the API for models which support streaming).

Figures represent performance of the model's first-party API (e.g. OpenAI for o1) or the median across providers where a first-party API is not available (e.g. Meta's Llama models).

延迟

按首 Token 延迟（秒）衡量

Latency: Time To First Answer Token

Seconds to first answer token received · Accounts for reasoning model 'thinking' time
Reasoning models are indicated by a lightbulb icon

Time to first answer token received, in seconds, after API request sent. For reasoning models, this includes the 'thinking' time of the model before providing an answer. For models which do not support streaming, this represents time to receive the completion.

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

End-to-End Response Time vs. Price

End-to-end response time: end-to-end seconds to output 500 tokens · USD per 1M tokens (blended)
Most attractive quadrant
Pareto line
Reasoning models are indicated by a lightbulb icon

Price per token, shown in USD per million tokens. Price is a blend of cache hit, input, and output token prices using the selected ratio (default 7:2:1 cache-input-output).

进一步分析
StepFun 标志
Step 3.7 Flash
256k
开放
30
$0.09
364
0.92
7.79
5.49
模型
服务商
StepFun 标志
Step 3.5 Flash 2603
256k
专有
26*
--
144
1.02
18.36
13.87
模型
服务商
StepFun 标志
Step 3.5 Flash
256k
开放
26*
--
149
1.06
17.86
13.44
模型
服务商

关键定义

Maximum number of combined input & output tokens. Output tokens commonly have a significantly lower limit (varied by model).

常见问题

关于 StepFun 的常见问题

StepFun 提供我们跟踪的 3 个模型：Step 3.7 Flash、Step 3.5 Flash 2603和Step 3.5 Flash。

StepFun 上最智能的模型是 Step 3.7 Flash，Intelligence Index 得分为 30。

按输出速度计算，StepFun 上最快的模型是 Step 3.7 Flash，速度为每秒 364.0 个 token。

StepFun 上首个答案 Token 延迟最低的模型是 Step 3.7 Flash，延迟为 6.41 秒。延迟越低，初始响应越快。

按混合价格计算，StepFun 上最实惠的模型是 Step 3.5 Flash 2603，每 100 万 token 的价格为 $0.06（缓存命中/输入/输出比例为 7:2:1）。

StepFun 上各模型价格最多相差 3 倍，从最实惠的 Step 3.5 Flash 2603（每 100 万 token $0.06）到最昂贵的 Step 3.7 Flash（每 100 万 token $0.18）。

是，StepFun 提供兼容 OpenAI 的 API，可以轻松从 OpenAI 切换，或继续使用现有的 OpenAI SDK 集成。

StepFun 上 3 个模型中，有 2 个支持用于结构化输出的 JSON 模式。

是，StepFun 上全部 3 个模型均支持函数调用（工具使用）。

是，StepFun 提供 3 个推理模型：Step 3.7 Flash、Step 3.5 Flash 2603和Step 3.5 Flash。推理模型会先进行扩展思考来解决复杂问题，再给出答案。

是，StepFun 上 3 个模型中有 2 个是开放权重模型：Step 3.7 Flash和Step 3.5 Flash。

会。服务商性能可能因基础设施变化、负载均衡和更新而随时间波动。我们持续对所有服务商进行基准测试，并在“随时间变化”图表中展示历史性能趋势。

选择 StepFun 上的模型时，请考虑：智能（适合质量敏感型任务）、输出速度（适合吞吐量密集型任务）、延迟（适合需要快速首次响应的交互式应用）、价格（适合成本敏感型工作负载），以及上下文窗口大小、JSON 模式或函数调用支持等功能。