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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.
Price/1M
$0.00
1st cheapest
100% below median
Top 27%
Context Window
256K
91st largest
Top 29%
Input
$0.00
per 1M tokens
Output
$0.00
per 1M tokens
Blended
$0.00
per 1M tokens
Cheaper than 73% of models. Median price is $0.31/1M tokens.
Daily
$0.00
Monthly
$0.00
Context Window
256K
tokens
Larger than 71% of models
Max Output
256K
tokens
100% of context
Context Window Comparison