Models / StepFun

Step 3.5 Flash 2603

stepfun/step-3.5-flash-2603

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

Source-linkedOpen weightsReleased 2026-04-02

Report data

Context window256K

Maximum output256K

Provider offers4

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
Provider	Provider model ID	Context	Input / 1M	Output / 1M	Cached / 1M	Features	All pricing
StepFun AI	`step-3.5-flash-2603`	256K	$0.100	$0.300	$0.020	R T ·	View { "cache_read": 0.02, "input": 0.1, "output": 0.3 }
NanoGPT	`stepfun-ai/step-3.5-flash-2603`	256K	$0.100	$0.300	—	R · ·	View { "input": 0.1, "output": 0.3 }
StepFun	`step-3.5-flash-2603`	256K	$0.100	$0.300	$0.020	R T ·	View { "cache_read": 0.02, "input": 0.1, "output": 0.3 }
EmpirioLabs AI	`step-3-5-flash-2603`	256K	$0.100	$0.300	$0.020	R T ·	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 3.5 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

Qwen3 Max

26.4

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

Gemini 2.5 Flash

39.4

Step 3.5 Flash 2603

38.5

Terminal-Bench Hard vs top 7 models

GPT-5-Codex

37.9

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

GLM-4.5-Air

20.5