StepFunstep-3.5-flash

StepFun: Step 3.5 Flash API Pricing

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....

Base Input Price$0.10/ 1M tokens

Base Output Price$0.30/ 1M tokens

Prompt Cache Read$0.050-50% discount

Batch API RateN/A24h async offload

Inference Hosts & Aggregator Providers

Compare rates and latency across direct APIs, OpenRouter, and hyperscale cloud providers

Live verified rates

Provider Name	Input / 1M	Output / 1M	Prompt Caching	Access Endpoint
StepFun Direct	$0.10	$0.30	Supported	Connect
OpenRouter	$0.10	$0.30	Supported	Connect

Head-to-Head Comparisons for StepFun: Step 3.5 Flash

StepFun: Step 3.5 Flash vs OpenAI: GPT-6.1 Sol$0.1/M vs $2/M

StepFun: Step 3.5 Flash vs GPT-4o (Omni)$0.1/M vs $2.5/M

StepFun: Step 3.5 Flash vs Claude 3.5 Sonnet$0.1/M vs $3/M

StepFun: Step 3.5 Flash vs DeepSeek-V3 (deepseek-chat)$0.1/M vs $0.27/M