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.
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
nn.n% — How the model compares to the reference models: Anthropic Sonnet 3.5 ("so35"), GPT-4o ("gpt4o") or GPT-4 ("gpt4").
What is the LLM Explorer Rank (Score)
Step 3.5 Flash Parameters and Internals
| LLM Name | Step 3.5 Flash |
| Repository 🤗 | https://huggingface.co/stepfun-ai/Step-3.5-Flash |
| Base Model(s) | |
| Model Size | 199.4b |
| Required VRAM | 8.6 GB |
| Updated | 2026-03-27 |
| Maintainer | stepfun-ai |
| Model Type | step3p5 |
| Model Files | |
| Model Architecture | Step3p5ForCausalLM |
| License | apache-2.0 |
| Context Length | 262144 |
| Model Max Length | 262144 |
| Vocabulary Size | 128896 |
| Torch Data Type | bfloat16 |
Quantized Models of the Step 3.5 Flash
Model |
Likes |
Downloads |
VRAM |
|---|---|---|---|
| Step 3.5 Flash 8bit | 2 | 1721 | 210 GB |
Rank the Step 3.5 Flash Capabilities
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Original data from HuggingFace, OpenCompass and various public git repos.
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Release v20260327b