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Step 3.5 Flash
StepFun
🧠 Language Model
StepFun's latest reasoning model, 196B MoE (11B active), 256K context, open-source Apache 2.0. Fast agentic intelligence with strong code and math.
Specifications
Input modalitiestext
Output modalitiestext
Capabilitiestools, reasoning
Relative speed●●●●○ Fast
Context window256,000 tokens
Max output16,384 tokens
Vision inputNo
Tool callingYes
Streaming outputYes
Input price$0.175 / 1M
Output price$0.525 / 1M
Pricing
$0.175 / 1M input tokens · $0.525 / 1M output tokens
Platform credit pricing — live rates on the Models page.