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by Stepfun

StepFun: Step 3.7 Flash.

multimodal closed 256K ctx
Cheapest input
$0.2/M
on OpenRouter
Cheapest output
$1.15/M
on OpenRouter
Hosted equiv.
~$0.41/hr
@ 100 tok/s on OpenRouter

Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model. It pairs a 196B-parameter language backbone with a vision encoder for native image and video understanding, activating roughly 11B p

Hosted API only

No self-host path — closed weights.

StepFun: Step 3.7 Flash's weights aren't published. Use it via the access providers below.

Where to use it

Cheapest hosted endpoints.

Provider Access $/M in $/M out
OpenRouter api aggregator $0.2 $1.15 Launch ↗
FAQ

Frequently asked.

How do I run StepFun: Step 3.7 Flash?
StepFun: Step 3.7 Flash is a closed-source API model. The cheapest way to access it is through the API providers listed on this page (direct API, aggregators, and hosted chat UIs).
Where can I access StepFun: Step 3.7 Flash?
StepFun: Step 3.7 Flash is available via OpenRouter. Each access option lists its own pricing (per million tokens or hourly hosting).
How much does it cost to run StepFun: Step 3.7 Flash?
API pricing starts at $0.2/M input tokens and $1.15/M output tokens. Self-hosting cost depends on the GPU you rent — see the Run It Yourself tab.
Is StepFun: Step 3.7 Flash open-source or proprietary?
StepFun: Step 3.7 Flash is a proprietary model from Stepfun. Access is API-only — there are no public weights to download.