StepFun (Global)

Step 3.5 Flash 2603

Name: Step 3.5 Flash 2603
Brand: StepFun (Global)

Canonical ID: stepfun-ai/step-3.5-flash-2603

More StepFun (Global) models More step-3.5-flash family models

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

Reasoning: Yes Tool use: Yes Open weights

Overview

text

Provider: StepFun (Global)
Family: step-3.5-flash
Release date: 2026-04-02
Last updated: 2026-04-02
Input modalities: text
Output modalities: text

Pricing and Limits

Token pricing

Input: $0.1/1M
Output: $0.3/1M
Cached input: N/A

Context and output

Context window: 256,000
Max output tokens: 256,000
Qualified ID: stepfun-ai/step-3.5-flash-2603

Model Summary

Step 3.5 Flash 2603 is a model listing in the StepFun (Global) provider catalog. It is categorized under the step-3.5-flash family.

The model supports text modalities across input/output paths. Reported context capacity is 256,000. Pricing is listed at $0.1/1M input and $0.3/1M output.

Same Family: step-3.5-flash

Comparable models in the same family across providers.

Browse family

Model	Provider	Context	Input	Output	Flags
Step 3.5 Flash stepfun/step-3.5-flash	StepFun	256,000	$0.096/1M	$0.288/1M	Reasoning Tools
Step 3.5 Flash nano-gpt/stepfun-ai/step-3.5-flash	NanoGPT	262,144	$0.1/1M	$0.3/1M	Reasoning
Step 3.5 Flash huggingface/stepfun-ai/Step-3.5-Flash	Hugging Face	262,144	$0.1/1M	$0.3/1M	Reasoning Tools
Step 3.5 Flash stepfun-ai/step-3.5-flash	StepFun (Global)	256,000	$0.1/1M	$0.3/1M	Reasoning Tools
Step 3.5 Flash stepfun-ai-step-plan/step-3.5-flash	StepFun Step Plan (Global)	256,000	N/A	N/A	Reasoning Tools
Step 3.5 Flash stepfun-step-plan/step-3.5-flash	StepFun Step Plan (China)	256,000	N/A	N/A	Reasoning Tools
Step 3.5 Flash nvidia/stepfun-ai/step-3.5-flash	Nvidia	256,000	$0/1M	$0/1M	Reasoning Tools
Step 3.5 Flash 2603 nano-gpt/stepfun-ai/step-3.5-flash-2603	NanoGPT	262,144	$0.1/1M	$0.3/1M	Reasoning
Step 3.5 Flash 2603 stepfun-step-plan/step-3.5-flash-2603	StepFun Step Plan (China)	256,000	N/A	N/A	Reasoning Tools
Step 3.5 Flash 2603 stepfun/step-3.5-flash-2603	StepFun	256,000	$0.1/1M	$0.3/1M	Reasoning Tools

Step 3.5 Flash 2603

Overview

Pricing and Limits

Token pricing

Context and output

Model Summary

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