DwarfStar is a small native inference engine optimized first for DeepSeek V4 Flash (including the experimental vision model). It also supports GLM 5.2 and 5.3, GLM 5.3 Flash, and DeepSeek V4 PRO. It is self-contained and deliberately narrow, not a general GGUF runner. Model loading, prompt rendering, tool calls, KV state, the HTTP server, and the coding agent are built and tested together. The repository also includes tools and data for GGUF, imatrix, quality, and speed.

Supported backends:

• Metal, the primary target, on Macs with 96 GB or more. Smaller machines can use SSD streaming.
• NVIDIA CUDA, including multi-GPU systems and DGX Spark.
• ROCm on Strix Halo systems such as the Framework Desktop.

This project would not exist without llama.cpp and GGML, make sure to read the acknowledgements section, a big thank you to Georgi Gerganov and all the other contributors.

Model support is intentionally opportunistic. The project follows the best open weights for useful local machine sizes, especially 128 GB laptops and 512 GB workstations. A model may be removed when a better replacement arrives.

The project has first class support for SSD streaming of weights, so it is possible to run models bigger than RAM while often still getting decent performances, and even running very large models (like the full GLM 5.3 or DeepSeek v4 PRO) on systems with just 128GB of RAM at a slower speed, but fast enough for QA-style chats.

So, what can I do with this software?

• You can run a very capable models in your consumer hardware, a MacBook, a DGX Spark, or a Strix Halo for example. Even if you have not enough RAM, with SSD streaming, you can run it at a decent speed.
• You can use multiple CUDA cards as a multi-user LLM server. Ada Lovelace, including L40S, is supported: newer models can run here even when their other inference implementations require newer GPUs. Our eight-L40S Flash setup has reached about 126 t/s aggregate generation with 16 sessions.
• Using two 128 GB Macs connected with RDMA, you can run 4-bit DeepSeek Flash or GLM 5.3 Flash with tensor parallelism. Larger GLM 5.2 quants need larger machines, such as Mac Studios.
• You can also use pipeline paralellism to glue together multiple systems to sum their RAM and run larger models.

Motivations

• Capable open-weight models now fit on high-end personal machines.
• DeepSeek V4 Flash and PRO, GLM 5.2, tolerate aggressive routed-expert quantization.
• Compressed KV caches and fast local SSDs make long contexts practical.
• The idea of an inference system specialized for a few models.

AI full disclosure

• This software is developed with strong assistance from GPT 5.5, 5.6, Claude Fable and with humans leading the ideas, testing, and debugging. We say this openly because it shaped how the project was built. If you are not happy with AI-developed code, this software is not for you. The acknowledgement below is equally important: this would not exist without llama.cpp and GGML, largely written by hand.

Acknowledgements to llama.cpp and GGML

ds4.c does not link against GGML, but it exists thanks to the path opened by the llama.cpp project and the kernels, quantization formats, GGUF ecosystem, and hard-won engineering knowledge developed there. We are thankful and indebted to llama.cpp and its contributors. Their implementation, kernels, tests, and design choices were an essential reference while building this DeepSeek V4 specific inference path. Some source-level pieces are retained or adapted here under the MIT license: GGUF quant layouts and tables, CPU quant/dot logic, and certain kernels. For this reason, and because we are genuinely grateful, we keep the GGML authors copyright notice in our LICENSE file.

Status

The software is currently very fast changing. Consider it beta quality. Before each release, a big QA run is executed, however instabilities are definitely possible.

How to use this project?

I (Salvatore) believe that the way projects should be shipped and used changed because of AI. The main differences today are:

1. With AI, users can modify the software in significant ways with low efforts, costs, and even lacking deep domain knowledge about the task they want to accomplish. For instance, a DwarfStar user with a specific hardware setup can ask a coding agent to improve the inference speed of this software for the specific hardware setup, asking the model to reach the maximum prefill and generation speed without impacting correctness, and also asking to do a deep QA pass.
2. Similiarly, because of "1", software may be shipped in a different way than before. It must be more a working template for the biggest use cases, without trying to cover every possible setup. If DwarfStar showcases a few good implementations of tensor parallel execution, the code will work as a rail for implementing the same feature in specific conditions, for a new model, and so forth.

So, while this project attempts to be usable for the featured models and the most common hardware setups, I ask you, if you have access to coding agents, to consider using coding agents as an interface to discover the project, make modifications, create personalized setups. This way you can likely do more than what we ship, and certain things that are not documented or implemented, and that you require, are potentially very easy to achieve.

Start Here

git clone https://github.com/antirez/ds4.git
cd ds4

Choose your build. The platform guides cover prerequisites, memory sizing, and hardware-specific setups:

Platform guide	Build
Metal on Apple Silicon	make
DGX Spark	make cuda-spark
Strix Halo / Framework Desktop	make strix-halo
One or more CUDA cards, including Ada/L40S	make cuda-generic

For a first run on a 96 or 128 GB machine, download DeepSeek V4 Flash Q2:

./download_model.sh ds4f-q2

Downloads go in gguf/. Repeat the command to resume an interrupted download. Leave memory for the context and runtime buffers as well as the model. See other models or use SSD streaming on a smaller Mac.

Everyday Use

Once built and with a model downloaded:

./ds4
./ds4 -p "Explain Redis streams in one paragraph."
./ds4-agent
./ds4-server --ctx 32768

The default model is ds4flash.gguf, a link updated by main-model downloads. Pass -m FILE to choose explicitly. Commands normally run from the repository root; use --chdir /path/to/ds4 when launching elsewhere.

The server listens at http://127.0.0.1:8000 by default; see serving for API access and multiple sessions.

The interactive CLI keeps a multi-turn conversation. Use /help, /read FILE, /ctx N, and /quit. Ctrl+C interrupts generation and returns to the prompt. Run each binary with --help for its full options.

Native coding agent

ds4-agent runs inference directly, without a separate HTTP server. It keeps the token history and live model state together, shows prefill progress, and uses the model's native tool format. DeepSeek and GLM have their own templates.

Sessions are stored in ~/.ds4/kvcache:

Command	Action
/save	Save the current session
/list	List saved sessions
/switch <sha>	Resume a session
/del <sha>	Delete a saved session
/strip <sha>	Keep text and title, removing the large KV payload

Compatible local KV snapshots avoid rebuilding the prompt. Stripped sessions and network TP restores require prefill. Sessions containing images cannot yet be saved. Saved conversations and traces may contain private information.

For Pi, OpenCode, Codex CLI, or Claude Code, use ds4-server instead and follow the client setup guide.

Models, images, and speculation

Models and vision lists the supported downloads and memory requirements. DeepSeek Vision Experimental uses a different checkpoint from Flash 0731; GLM 5.3 Flash adds vision to the same text model.

With the matching encoder passed as --vision FILE, use /read image.png in the CLI or view_image in the native agent.

Speculative decoding is opt-in. GLM uses --mtp; Flash DSpark needs a matching support GGUF. It can improve generation, but not every workload benefits. Read speculative decoding for setup and the difference between default opportunistic sampling and --mtp-exact-sampling.

Output and power

Thinking is enabled by default. Use --nothink or /nothink for direct answers, and --think or /think to enable it again. The normal sampling defaults are temperature 1, top-p 1, and min-p 0.05; --temp 0 selects greedy output.

For DeepSeek, --power N trades throughput for lower sustained GPU load. The default is 100. GLM currently requires --power 100.

DeepSeek Flash and GLM 5.3 Flash also support directional steering. Load a vector with --dir-steering-file FILE; /steer F adjusts its scale for subsequent tokens in a local CLI or agent session, without rebuilding the existing KV cache. See steering documentation.

--prefix-file FILE preloads complete USER: / ASSISTANT: pairs before the live conversation. A turn marker must start a line, roles must alternate, and the last turn must be ASSISTANT:.

Capability Evaluation

ds4-eval runs embedded capability regression tests against a real GGUF. These are DwarfStar integration checks, not official leaderboard scores.

./ds4-eval -m ds4flash.gguf --trace /tmp/ds4-eval.txt
./ds4-eval -m ds4flash.gguf --suite hard-smoke
./ds4-eval -m ds4flash.gguf --suite hard --retry-incomplete

The default suite is core; --suite all runs core and hard cases. --list-cases lists tests without loading a model. --plain selects non-interactive output, and --regrade-trace FILE scores an existing trace without generating again. Sources and licenses are in EVAL_DATA.md. For inference correctness and release checks, read testing.

Speed

This recorded DeepSeek V4 Flash Q2 sweep uses an M5 Max with 128 GB RAM, 2048-token continued-prefill intervals, and 128 greedy generation tokens per frontier. It is a baseline, not a fresh benchmark of every commit.

See performance and benchmarking for the full numbers, DGX Spark results, comparison conditions, and benchmark commands.

Detailed Guides

• Models and vision: Flash, PRO, GLM, and matching encoders.
• SSD streaming: run larger than RAM and size the cache.
• Inference across machines: two-Mac TP/RDMA and layer pipelines.
• Speculative decoding: DSpark, GLM MTP, and sampling.
• Serving: APIs, images, batching, and disk KV caches.
• Coding agent clients: Pi, OpenCode, Codex CLI, and Claude Code.
• Performance: reproducible measurements and recorded baselines.
• Testing and development: regression tests, debugging, and model-building tools.

Read CONTRIBUTING.md before sending a pull request.

Logo

The DwarfStar logo was designed by hand by Salvatore Sanfilippo, made more graphical with AI, and manually reworked by Ben Gnomino, whose human touch made it rock.