Context
256K tokens (~128 books)
Input $/1M
Free
Output $/1M
Free
Type
text
License
Open Source
Benchmarks
0 tested
Data as of
About
Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token. It is a reasoning model that is incredibly speed efficient even at long contexts.
No benchmark data available yet.
Links
Research
Documentation
Community
Source Code
BenchGecko API
step-3-5-flash-free
Specifications
- Typetext
- Context256K tokens (~128 books)
- ReleasedJan 2026
- LicenseOpen Source
- StatusActive
- Cost / Message~$0.000
Available On
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Frequently Asked Questions
Step 3.5 Flash (free) is an open-source text AI model by stepfun, released in January 2026. Context window: 256K tokens.
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Key facts · as of 2026-04-08
- Step 3.5 Flash (free) by stepfun. Not enough public benchmark scores to rank yet.
- List price free input · free output per 1M tokens (as of 2026-04-08).
How to cite · data as of 2026-04-08
Step 3.5 Flash (free) · benchmarks, pricing and providers. BenchGecko, data as of 2026-04-08. https://benchgecko.ai/model/step-3-5-flash-free
Credit "Source: BenchGecko" with a link. Prices per provider and Gecko Tests are BenchGecko data (CC BY 4.0); benchmark scores keep their original source, listed in the JSON. JSON · llms.txt · MCP