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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....
How much does StepFun: Step 3.5 Flash cost for a real workload?
At 10M input + 2M output tokens per month, StepFun: Step 3.5 Flash costs about $1.6 ($1 input + $0.6 output). Try your own volumes in the cost calculator.
What are cheaper alternatives to StepFun: Step 3.5 Flash?
- DeepSeek: DeepSeek V4.1 Flash — $0.02394 in / $0.375 out per 1M
- Google: Gemma 4 26B A4B — $0.09 in / $0.3 out per 1M
- Qwen: Qwen3 30B A3B Instruct 2507 — $0.09 in / $0.3 out per 1M
- Meta: Llama 3.2 3B Instruct — $0.0509 in / $0.335 out per 1M
- Mistral: Mistral Small 4 (batch) — $0.075 in / $0.3 out per 1M
- ByteDance Seed: Seed 1.6 Flash — $0.075 in / $0.3 out per 1M
Compare StepFun: Step 3.5 Flash with other models
StepFun: Step 3.5 Flash vs StepFun: Step 3.7 FlashStepFun: Step 3.5 Flash vs StepFun: Step 5 Preview
Frequently asked questions
How much does StepFun: Step 3.5 Flash cost?
StepFun: Step 3.5 Flash costs $0.1 per 1M input tokens and $0.3 per 1M output tokens (list price, snapshot October 21, 2026). At 10M input + 2M output tokens per month that is about $1.6.
What is the context window of StepFun: Step 3.5 Flash?
StepFun: Step 3.5 Flash has a context window of 262,144 tokens and can return up to 65,536 output tokens per response.
What are cheaper alternatives to StepFun: Step 3.5 Flash?
Cheaper models include DeepSeek: DeepSeek V4.1 Flash ($0.02394 in / $0.375 out), Google: Gemma 4 26B A4B ($0.09 in / $0.3 out), Qwen: Qwen3 30B A3B Instruct 2507 ($0.09 in / $0.3 out). See the full list on this page.
Is StepFun: Step 3.5 Flash free to use?
No. StepFun: Step 3.5 Flash is a paid model at $0.1 input / $0.3 output per 1M tokens. 20 free models are listed on the free models page.
Provider: stepfun · Model ID: stepfun/step-3.5-flash · Modality: text->text · Price snapshot October 21, 2026, refreshed daily. How we collect prices