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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
56th of 442
Top 13%
Coding Index
31.6
68th of 352
Top 20%
Price/1M
$0.15
258th cheapest
52% below median
Top 40%
Speed
81 tok/s
Top 35%
TTFT
1.56s
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 $0.31/1M tokens.
Daily
$0.15
Monthly
$4.50
81
tokens/sec
Faster than 65% of models
1.56
seconds
Faster than 17% of models
26.36
seconds
Faster than 8% of models
Market Median
46 tok/s
77% faster
Median TTFT
0.42s
272% slower
Throughput/Dollar
537
tok/s per $/1M
Speed Comparison
Context Window
256K
tokens
Larger than 71% of models
Max Output
256K
tokens
100% of context