Step 3.5 Flash 2603
StepFunOpen WeightApache 2.0 · Commercial OK
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
2026-04-02
Parameters
196.0B
Context Length
256K
Modalities
image, text
Capability Radar
26
general
39
coding
83
reasoning
56
science
70
agents
80
multimodal
Rankings
| Domain | #Rank | Score | Source |
|---|---|---|---|
| Agentic Capability | 31 | 55.0 | LS |
| Code Ranking | 163 | 61.0 | AA |
| General Ranking | 151 | 62.0 | AA |
| Science | 137 | 64.0 | AA |
Benchmark Scores (LLM Stats)
(LLM Stats (zeroeval))Agents
Tau-bench
88.2%SR
BrowseCompOpenAI (2025)
69.0%SR
Terminal-Bench 2.0Stanford × Laude Institute (2026)
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
(Artificial Analysis)Intelligence Index(Artificial Analysis)26.5
Tau2(Sierra + U Toronto + Vector Institute (2025))0.9
Gpqa(NYU + Cohere + Anthropic (2023))0.8
Ifbench(Google Research (2023))0.7
Lcr(Artificial Analysis)0.6
Scicode(UIUC + Argonne National Lab (2024))0.4
Terminalbench Hard(Stanford × Laude Institute (2026))0.3
Hle(Center for AI Safety + Scale AI (2025))0.2
LLM Stats Category Scores
(LLM Stats (zeroeval))Math90
Reasoning80
General80
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/sec0.0
Time to First Token0.00s
Time to Answer0.00s
Provider Price Ranking
Provider Price Ranking
4 providers
Cheapest: StepFunMost Expensive: EmpirioLabs AI
ProviderInputOutput
1StepFunCheapest
$0
$0
2StepFun (China)
$0.1
$0.3
3StepFun (Global)
$0.1
$0.3
4EmpirioLabs AI
$0.1
$0.3
Compare pricing across different API providers for this model.