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Launch BTL-3 Compact locally

This repository ships a relocatable macOS arm64 server bundle for the exact BTL-3 Compact AVQ2 artifact:

  • model: BTL-3-Compact-AVQ2.gguf
  • bytes: 8,392,369,600
  • SHA-256: 2ddf9527620a17a2a6739d184a7096c45712092e6589128792ec6254e94dc30c
  • runtime: llama.cpp build 9596, commit 9fcaed763

The model is external to the 28 MB runtime bundle. The launcher finds the model in artifacts/release, in the bundle's model directory, or at BTL3_MODEL.

Build and verify the bundle

Run this on an Apple Silicon Mac with Homebrew OpenSSL 3 installed:

rm -rf artifacts/runtime/BTL-3-Compact-macos-arm64
.venv/bin/python tools/build_macos_arm64_bundle.py

The builder copies the native dependency closure, rewrites absolute install names and rpaths, ad-hoc signs the result, includes dependency licenses, and writes bundle-manifest.json.

OpenAI-compatible API

Start the server:

BTL3_CTX_SIZE=4096 \
  artifacts/runtime/BTL-3-Compact-macos-arm64/bin/btl3-server

Check it:

curl -s http://127.0.0.1:8080/health
curl -s http://127.0.0.1:8080/v1/models

Call chat completions with any OpenAI-compatible client:

curl http://127.0.0.1:8080/v1/chat/completions \
  -H 'Content-Type: application/json' \
  -d '{
    "model": "BTL-3",
    "messages": [{"role": "user", "content": "Write a retrying fetch helper."}],
    "stream": true
  }'

Useful configuration:

Variable Default Meaning
BTL3_HOST 127.0.0.1 Listen address
BTL3_PORT 8080 OpenAI API port
BTL3_CTX_SIZE 32768 Allocated context
BTL3_PARALLEL 1 Concurrent slots
BTL3_GPU_LAYERS 99 Layers requested on Metal
BTL3_API_KEY unset Optional local bearer key
BTL3_MODEL_ALIASES BTL-3 Comma-separated transport aliases

On a 16 GB Mac, begin at 2K–4K context. A larger context raises KV-cache and working-memory requirements. The model's declared context length is not a promise that a particular device can allocate it.

LM Studio

LM Studio's official openai-compat-endpoint generator can target the local API. Its current model picker uses a fixed set of model IDs, so expose one of those IDs as a transport alias:

BTL3_API_KEY=btl3-local \
BTL3_MODEL_ALIASES='BTL-3,gpt-4.1-2025-04-14' \
BTL3_CTX_SIZE=4096 \
  artifacts/runtime/BTL-3-Compact-macos-arm64/bin/btl3-server

Then:

  1. Install the official plugin from its LM Studio Hub page.
  2. Set Override Base URL to http://127.0.0.1:8080/v1.
  3. Set its API key to btl3-local.
  4. Select gpt-4.1-2025-04-14.

That name is only protocol routing. The served model remains BTL-3; the integration does not claim it is an OpenAI model.

Ollama CLI

Stock Ollama does not load BTL-3's custom AVQ2 GGUF. Do not use ollama create. The supplied bridge lets the unmodified Ollama CLI speak to the native BTL-3 server through Ollama's local HTTP protocol.

In terminal one:

BTL3_CTX_SIZE=4096 \
  artifacts/runtime/BTL-3-Compact-macos-arm64/bin/btl3-server

In terminal two:

BTL3_CTX_SIZE=4096 \
  artifacts/runtime/BTL-3-Compact-macos-arm64/bin/btl3-ollama-bridge

Then use the installed Ollama CLI:

OLLAMA_HOST=http://127.0.0.1:11435 ollama list
OLLAMA_HOST=http://127.0.0.1:11435 ollama show btl3-compact:latest
OLLAMA_HOST=http://127.0.0.1:11435 ollama run btl3-compact:latest

The bridge implements /api/chat, /api/generate, /api/tags, /api/show, /api/ps, and /api/version. It maps streaming to Ollama NDJSON and preserves reasoning, tool calls, structured output, cancellation, token counts, and the common sampling options. Unsupported Ollama management endpoints return 501 instead of pretending to work.

Validation status

The packaged executable has passed native model load, graph reservation, /health, and /v1/models checks on Apple M2. Protocol tests pass using the real installed Ollama CLI and a deterministic OpenAI-compatible upstream.

The native Metal runtime accelerates AVQ2, affine INT4, the vocabulary head, and rescued and ordinary embedding rows without reconstructing dense weights. On a base Apple M2 with 16 GB unified memory, a clean full-model smoke measured 2.30 prompt tokens/second and 2.48 generated tokens/second at a 128-token allocated context. Treat those as one-device smoke results, not universal throughput claims. Context size, prompt length, thermal state, and Apple chip generation will change performance.

The exact GGUF has passed full-model native CUDA execution on an RTX PRO 6000 Blackwell Server Edition. Three repetitions measured 84.70 prompt tokens/second and 43.16 generated tokens/second with full GPU offload. This does not establish RTX 4090, RTX 5090, DGX Spark, or Windows compatibility; each target still requires its own packaged-runtime gate. Do not reuse the old Python/Triton H100 number as a native-runtime claim.

The native server may display roughly 7.7B n_params; that value counts packed stored elements, not the logical 27B architecture. Product metadata exposed by the bridge reports the logical model class.