StepFun: Step 3.5 Flash

stepfun/step-3.5-flash

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....

Prompt $/1M

$0.100

Completion $/1M

$0.300

Context

262,144 tok

Best provider

294 tok/s · Artificial Analysis

Specs

Model id: stepfun/step-3.5-flash
Display name: StepFun: Step 3.5 Flash
Modality: text->text
Tokenizer: Other
Instruct type: —
Context length: 262,144
Max completion: 65,536
Prompt $/1M: $0.100
Completion $/1M: $0.300
Free tier: no

Capabilities

Function callingno
JSON modeno
System promptno
Visionno
Moderatedno

Benchmark scores

Each axis is one benchmark, normalized to the best model in the field.

No benchmark data for this model.

Speed by provider

Provider	tok/s	TTFT	Total latency
Artificial Analysis	294	734 ms	—
Parasail	102	520 ms	603 ms
StepFunfastest	92	1,051 ms	1,296 ms
Ambient	76	749 ms	945 ms
DeepInfrafastest	56	322 ms	427 ms
SiliconFlowfastest	42	1,227 ms	1,490 ms
stepfunfastest	—	—	—