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by Stepfun

StepFun: Step 3.5 Flash.

text open weights 262K ctx
Cheapest input
$0.09/M
on DeepInfra
Cheapest output
$0.3/M
on DeepInfra
Fastest
107 tok/s
on OpenRouter
Hosted equiv.
~$0.11/hr
@ 100 tok/s on DeepInfra

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....

Where to use it

Cheapest hosted endpoints.

Provider Access $/M in $/M out
DeepInfra hosted inference $0.09 $0.3 Launch ↗
OpenRouter api aggregator $0.09 $0.3 Launch ↗
Performance

Speed across providers.

Tokens/sec and time-to-first-token measured against the same prompt template on each provider's API.

Provider Tokens/sec TTFT Total
OpenRouter 107.1 — 4667 ms
FAQ

Frequently asked.

How do I run StepFun: Step 3.5 Flash?
StepFun: Step 3.5 Flash is open-weight, so you can self-host on rented GPUs. See the Run It Yourself tab for GPU configurations + cost estimates, or use one of the hosted inference providers listed on this page.
Where can I access StepFun: Step 3.5 Flash?
StepFun: Step 3.5 Flash is available via DeepInfra, OpenRouter. Each access option lists its own pricing (per million tokens or hourly hosting).
How much does it cost to run StepFun: Step 3.5 Flash?
API pricing starts at $0.09/M input tokens and $0.3/M output tokens. Self-hosting cost depends on the GPU you rent — see the Run It Yourself tab.
Is StepFun: Step 3.5 Flash open-source or proprietary?
StepFun: Step 3.5 Flash is open-weight under the license. You can download and self-host it.