Add model card

README.md

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+---
+license: apache-2.0
+library_name: gguf
+base_model: HuggingFaceBio/Carbon-500M
+language:
+- dna
+tags:
+- dna
+- genomic
+- llama.cpp
+- gguf
+- hybriddna
+---
+
+# Carbon-500M GGUF
+
+GGUF (bf16) conversion of [HuggingFaceBio/Carbon-500M](https://huggingface.co/HuggingFaceBio/Carbon-500M) for use with [llama.cpp](https://github.com/ggml-org/llama.cpp).
+
+Carbon is a hybrid DNA / English language model that switches between Qwen3-4B-Base byte-level BPE for natural text and fixed 6-mer chunking for DNA inside `<dna>...</dna>` tags.
+
+## Requires llama.cpp with HybridDNATokenizer support
+
+Loading these GGUFs needs `LLAMA_VOCAB_TYPE_HYBRIDDNA`, which is not yet in upstream llama.cpp. Until the PR merges, build from the [`carbon-3b-tokenizer`](https://github.com/kashif/llama.cpp/tree/carbon-3b-tokenizer) branch:
+
+```bash
+git clone -b carbon-3b-tokenizer https://github.com/kashif/llama.cpp
+cd llama.cpp && cmake -B build && cmake --build build -j
+```
+
+## Files
+
+| File | Quant | Size |
+|---|---|---|
+| `carbon-500m-bf16.gguf` | bf16 (lossless from source) | 983 MB |
+
+## Usage
+
+### Basic DNA completion
+
+```bash
+./build/bin/llama-completion -m carbon-500m-bf16.gguf \
+    -p '<dna>ATGCGCTAGCTACGATCGATCGTAGCTAGCTAGCTAGCTACG' \
+    -n 64 --temp 0 -no-cnv
+```
+
+### As a draft model for speculative decoding
+
+Carbon-500M shares the HybridDNA vocab with the larger models, so it makes an excellent draft model:
+
+```bash
+# 8B target + 500M draft -> ~2x speedup at temp=0
+./build/bin/llama-speculative \
+    -m  carbon-8b-bf16.gguf \
+    -md carbon-500m-bf16.gguf \
+    -p '<dna>ATGCGCTAGCTACGATCGATCGTAGCTAGCTAGCTAGCTACG' \
+    -n 256 --temp 0
+```
+
+## See also
+
+- Source weights: [HuggingFaceBio/Carbon-500M](https://huggingface.co/HuggingFaceBio/Carbon-500M)
+- Other GGUF variants: [500M](https://huggingface.co/HuggingFaceBio/Carbon-500M-GGUF) · [3B](https://huggingface.co/HuggingFaceBio/Carbon-3B-GGUF) · [8B](https://huggingface.co/HuggingFaceBio/Carbon-8B-GGUF)
+
+## License
+
+Apache-2.0, inherited from the source model.