Atomic-Germ / OpenAI-NEO-CODE-20B-NPU2

huggingface.co
Total runs: 89
24-hour runs: -5
7-day runs: -38
30-day runs: -544
Model's Last Updated: August 20 2026
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Introduction of OpenAI-NEO-CODE-20B-NPU2

Model Details of OpenAI-NEO-CODE-20B-NPU2

* Config is not perfect yet, spurious think tags

OpenAI-NEO-CODE-20B - Q4NX for FastFlowLM (AMD Ryzen AI XDNA2)

A code-focused GPT-OSS-20B fine-tune, converted to Q4NX for FastFlowLM.

What is Q4NX?

Q4NX is FastFlowLM's native packed-quantization format - in the case of GPT-OSS a rearranged Q4_1-Q4NX layout tuned for the NPU matrix engine's tile sizes and memory access patterns. It is not a GGUF file and it does not run on llama.cpp or Ollama; it is meant exclusively for the FastFlowLM engine on AMD Ryzen AI NPUs.

Requirements
  • FastFlowLM >= 0.9.45 ( flm CLI)
  • AMD Ryzen AI processor with XDNA2 (NPU2) - Strix Point / Ryzen AI 300 series or later
  • Linux with the XRT NPU stack installed
  • ~16 GB of unified system memory (Q4NX weights + activations + KV cache)
Files
File Purpose
model.q4nx Quantized Q4NX weights
config.json FastFlowLM model configuration
tokenizer.json Tokenizer
tokenizer_config.json Special tokens and chat template
chat_template.jinja Chat template (optional)
flm-add.py Installer script - registers this model with FastFlowLM
Install and run

This repository ships flm-add.py , a small installer that copies the model into the FastFlowLM user directory and registers the tag. It never modifies the system FastFlowLM install.

Run python3 ./flm-add.py --help for all options. Without a clone, the same command works against the repo id directly:

python3 ./flm-add.py Atomic-Germ/OpenAI-NEO-CODE-20B-NPU2 --tag openai-coder-neo:20b --family gpt-oss
Kernels

FastFlowLM's NPU kernels (xclbins) are closed source and are not shipped in this repository. flm-add.py links the kernels of the official gpt-oss:8b model ( GPT-OSS-20B-NPU2 ), because this model shares the same engine family ( gpt-oss ) and architecture.

Serve (OpenAI-compatible)
flm serve openai-coder-neo:20b --port 8080
curl http://127.0.0.1:8080/v1/chat/completions \
  -H 'Content-Type: application/json' \
  -d '{"model":"openai-neo-code:20b","messages":[{"role":"user","content":"Hello!"}],"max_tokens":256}'
Model
  • Registry tag: openai-coder-neo:20b
  • Engine family: gpt-oss
  • Kernel source: GPT-OSS-20B-NPU2
  • Context length: 131,072 tokens (from config)
  • model.q4nx size: 14.45 GB
  • Base model: openai/gpt-oss-20b
  • License: apache-2.0

Original model card

See the upstream model card for training details, benchmarks, and upstream usage. This repository only contains the Q4NX conversion for FastFlowLM.

Runs of Atomic-Germ OpenAI-NEO-CODE-20B-NPU2 on huggingface.co

89
Total runs
-5
24-hour runs
-14
3-day runs
-38
7-day runs
-544
30-day runs

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