LLM EXPLORER 57,918 MODELS INDEXED

Step 3.5 Flash by stepfun-ai

By stepfun-ai · 167827 downloads
HF Repo ↗ Copy URL

Step 3.5 Flash is an open-source language model by stepfun-ai. Features: 199.4b LLM, VRAM: 8.6GB, Context: 256K, License: apache-2.0, LLM Explorer Score: 0.52, ELO: 1394.

  Arxiv:2507.19427   Arxiv:2601.05593   Arxiv:2602.10604   Conversational   Custom code   Eval-results   Region:us   Safetensors   Step3p5
Model Card on HF 🤗: https://huggingface.co/stepfun-ai/Step-3.5-Flash 

Step 3.5 Flash Benchmarks

LMSys ELO 1394 vs 1272 (so35) 9.6%
nn.n% — How the model compares to the reference models: Anthropic Sonnet 3.5 ("so35"), GPT-4o ("gpt4o") or GPT-4 ("gpt4").

Step 3.5 Flash Parameters and Internals

LLM NameStep 3.5 Flash
Repository 🤗https://huggingface.co/stepfun-ai/Step-3.5-Flash 
Base Model(s)  stepfun-ai/step-3.5-flash   stepfun-ai/step-3.5-flash
Model Size199.4b
Required VRAM8.6 GB
Updated2026-07-10
Maintainerstepfun-ai
Model Typestep3p5
Model Files  9.6 GB   8.6 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB   9.1 GB
Model ArchitectureStep3p5ForCausalLM
Licenseapache-2.0
Context Length262144
Model Max Length262144
Vocabulary Size128896
Torch Data Typebfloat16

Quantized Models of the Step 3.5 Flash

Model
Likes
Downloads
VRAM
Step 3.5 Flash 8bit2263210 GB
Step 3.5 Flash 4bit101164110 GB

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