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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.
Quality Index
37.8
57th of 444
Top 13%
Coding Index
31.6
69th of 354
Top 20%
Price/1M
$0.15
261st cheapest
50% below median
Top 40%
Speed
84 tok/s
Top 31%
TTFT
3.11s
Context Window
256K
91st largest
Top 29%
Input
$0.10
per 1M tokens
Output
$0.30
per 1M tokens
Blended
$0.15
per 1M tokens
Cheaper than 60% of models. Median price is $0.30/1M tokens.
Daily
$0.15
Monthly
$4.50
84
tokens/sec
Faster than 69% of models
3.11
seconds
Faster than 12% of models
27.04
seconds
Faster than 10% of models
Market Median
45 tok/s
84% faster
Median TTFT
0.42s
643% slower
Throughput/Dollar
557
tok/s per $/1M
Speed Comparison
Context Window
256K
tokens
Larger than 71% of models
Max Output
256K
tokens
100% of context