Step 3.5 Flash
StepFun
Description
Step-3.5-Flash is StepFun's fast, cost-effective text model optimized for quick inference. Built on their Step3 architecture, it offers strong performance across text tasks with low latency and efficient token usage, ideal for production workloads requiring speed and cost efficiency.
Release Date
2026-02-02
Parameters
—
Context Length
256K
Modalities
text
Capability Radar
24
general
40
coding
83
reasoning
55
scienceest.
70
agents
0
multimodal
Science uses a reasoning proxy when dedicated science benchmarks are unavailable.
Rankings
| Domain | #Rank | Score | Source |
|---|---|---|---|
| Agentic Capability | 14 | 69.0 | LS |
| Code Ranking | 190 | 50.0 | AA |
| General Ranking | 106 | 63.0 | AA |
| Science | 92 | 63.0 | AA |
Benchmark Scores (LLM Stats)
Agents
Tau-bench
88.2%SR
BrowseComp
69.0%SR
Terminal-Bench 2.0
51.0%SR
Code
SWE-Bench Verified
74.4%SR
General
LiveCodeBench v6
86.4%SR
Math
AIME 2025
97.3%SR
IMO-AnswerBench
85.4%SR
AA Evaluation Indices
Intelligence Index25.5
Tau20.9
Gpqa0.8
Ifbench0.6
Lcr0.4
Scicode0.4
Terminalbench Hard0.3
Hle0.2
LLM Stats Category Scores
Math90
General90
Reasoning80
Search70
Frontend Development70
Agents70
Tool Calling70
Code60
Pricing
Input Price$0.1 / 1M tokens
Output Price$0.3 / 1M tokens
Blended Price (3:1)$0.15 / 1M tokens
Cache Read Price$0.02 / 1M tokens
Speed
Tokens/sec202.0
Time to First Token0.83s
Time to Answer10.73s
Provider Price Ranking
Provider Price Ranking
2 providers
Cheapest: StepFunMost Expensive: StepFun AI
ProviderInputOutput
1StepFunPRIMARY
$0.1
$0.3
2StepFun AI
$0.1
$0.3
Compare pricing across different API providers for this model.