Step 3.5 Flash 2603
StepFun flash model for efficient multimodal reasoning, coding, and tool use
- Organization
- StepFun (China)
- Family
- —
- Providers
- 4
- Context
- 256,000
- Output limit
- 256,000
- Knowledge
- 2025-01
- Release
- 2026-04-02
- Updated
- 2026-04-02
- Weights
- Open
- Input
- text
- Output
- text
- Capabilities
- Tools, Reasoning, Temperature
Providers
Compare every cataloged offer for this model, including its provider, route, token limits, price, and capabilities.
| Provider | Model ID | Context | Output | Input / output · 1M | Reasoning | Tools | Structured | Details |
|---|---|---|---|---|---|---|---|---|
| EmpirioLabs AI | step-3-5-flash-2603 | 256,000 | 131,072 | $0.10 / $0.30 | Yes | Yes | Yes | View |
| NanoGPT | stepfun-ai/step-3.5-flash-2603 | 262,144 | 65,536 | $0.10 / $0.30 | Yes | No | No | View |
| StepFun Step Plan (China) | step-3.5-flash-2603 | 256,000 | 256,000 | — / — | Yes | Yes | — | View |
| StepFun Step Plan (Global) | step-3.5-flash-2603 | 256,000 | 256,000 | — / — | Yes | Yes | — | View |
Prices and limits apply to each offer. A dash means the value is not provided. OpenRouter offers show the hosting provider and routing channel separately.
Pricing
Compare token rates and cache charges across available routes and hosting configurations.
Lowest listed input and output prices across the offers above; they may belong to different providers. These are base rates, before conditional pricing, discounts or additional fees.
Frequently asked questions
Answers based on the model metadata and serving offers currently in the catalog.
How much does Step 3.5 Flash 2603 cost?
Listed rates start at $0.10 per million input tokens and $0.30 per million output tokens. Prices vary by provider and configuration; see Pricing for details.
Which providers offer Step 3.5 Flash 2603?
There are 4 cataloged offers across 4 providers. Compare model IDs, prices and limits in Providers.
What is the context window?
The cataloged model context is 256,000 tokens. Each serving endpoint may apply a different limit.
Does it support tools and structured output?
Tool calling: Yes. Structured output: Not reported. Support can vary by endpoint.
Resources
Catalog history · 2 recorded revisions
Metadata observations since this model was first cataloged. These are not model release versions.
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