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Step 3.5 Flash 2603

stepfun/step-3.5-flash-2603

StepFun flash model for efficient multimodal reasoning, coding, and tool use

Input modalitiesT
Output modalitiesT
Source-linkedOpen weightsReleased 2026-04-02
Report data
Context window256K
Maximum output256K
Provider offers6
Knowledge cutoff2025-01
Capabilities

What this model supports

ReasoningYes
Tool callingYes
Structured outputNo
AttachmentsNo
Temperature controlYes
Open weightsYes
Creator
StepFun
Family
Not documented
Modalities
Text
License
Not documented
Release date
2026-04-02
Model ID
stepfun/step-3.5-flash-2603
Market availability

Provider pricing

Report price →
Providers offering Step 3.5 Flash 2603
ProviderProvider model IDContextInput / 1MOutput / 1MCached / 1MFeaturesAll pricing
StepFun Step Plan (Global) logoStepFun Step Plan (Global)step-3.5-flash-2603256K$0 if offer.cost.input is defined else '—'}}$0 if offer.cost.output is defined else '—'}}$0 if offer.cost.cache_read is defined else '—'}}R T ·
View
{}
StepFun Step Plan (China) logoStepFun Step Plan (China)step-3.5-flash-2603256K$0 if offer.cost.input is defined else '—'}}$0 if offer.cost.output is defined else '—'}}$0 if offer.cost.cache_read is defined else '—'}}R T ·
View
{}
StepFun (Global) logoStepFun (Global)step-3.5-flash-2603256K$0.1 if offer.cost.input is defined else '—'}}$0.3 if offer.cost.output is defined else '—'}}$0.02 if offer.cost.cache_read is defined else '—'}}R T ·
View
{
  "cache_read": 0.02,
  "input": 0.1,
  "output": 0.3
}
NanoGPT logoNanoGPTstepfun-ai/step-3.5-flash-2603256K$0.1 if offer.cost.input is defined else '—'}}$0.3 if offer.cost.output is defined else '—'}}$0 if offer.cost.cache_read is defined else '—'}}R · ·
View
{
  "input": 0.1,
  "output": 0.3
}
StepFun (China) logoStepFun (China)step-3.5-flash-2603256K$0.1 if offer.cost.input is defined else '—'}}$0.3 if offer.cost.output is defined else '—'}}$0.02 if offer.cost.cache_read is defined else '—'}}R T ·
View
{
  "cache_read": 0.02,
  "input": 0.1,
  "output": 0.3
}
EmpirioLabs AI logoEmpirioLabs AIstep-3-5-flash-2603256K$0.1 if offer.cost.input is defined else '—'}}$0.3 if offer.cost.output is defined else '—'}}$0.02 if offer.cost.cache_read is defined else '—'}}R T S
View
{
  "cache_read": 0.02,
  "input": 0.1,
  "output": 0.3
}
Evidence

Published benchmark results

Artificial Analysis Coding Index vs top 7 models
GPT-5-Codex
38.9
Step 3.7 Flash
37.1
Step 3.5 Flash 2603
34.6
North Mini Code
33.4
Gemini 2.5 Pro
32.0
Step 3.5 Flash
31.6
GLM-4.6
29.5
SciCode vs top 8 models
Fugu
60.1
Fugu Ultra
58.7
Qwen3.7 Max
53.5
Gemini 2.5 Pro
42.8
GPT-5-Codex
40.9
Step 3.5 Flash
40.4
Step 3.7 Flash
40.0
Step 3.5 Flash 2603
38.5
Terminal-Bench Hard vs top 7 models
GPT-5-Codex
37.9
Step 3.7 Flash
35.6
Step 3.5 Flash 2603
32.6
Step 3.5 Flash
27.3
Gemini 2.5 Pro
26.5
GLM-4.6
25.0
GLM-4.5
22.0