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LLAMA.CPP · GGUF · QUANTIZATION · OPENAI API · CPU+GPU

llama.cpp API Server: One Runtime from Small Quantized Models to CPU+GPU Hybrid Serving

llama.cpp is a lightweight C/C++ inference runtime for GGUF models across CPU, GPU and hybrid offload. The current `llama-server` supports OpenAI-compatible chat/responses/embeddings routes, reranking, parallel decoding and monitoring.

cpu / 2026
01GGUF
02Quantization
03CPU + GPU
04OpenAI API
Updated · 18.08.2026
01
On this page

Is llama.cpp only for CPU inference?

No. The project supports NVIDIA CUDA, AMD HIP, Metal, Vulkan, SYCL and other backends, including partial CPU+GPU offload. This is useful on heterogeneous hardware but may have higher latency than full-GPU serving.

On this pagellama.cpp API Server: One Runtime from Small Quantized Models to CPU+GPU Hybrid Serving
01
Lightweight serving

How llama-server routes requests into CPU/GPU inference

The HTTP server accepts OpenAI-compatible requests, slot/continuous-batching logic manages contexts and GGUF layers run on CPU and/or GPU according to the selected backend.

01Client
02llama-server
03Slots / Batch
04GGUF Model
05CPU / GPU Backend
02
Hardware options

Why llama.cpp fits varied hardware classes

Quantization and broad backend support let it run from small CPU systems to Apple Silicon and NVIDIA/AMD GPU hosts.

CPU onlyLow costHigher latencySmall models
Full GPU offloadFastestNeeds VRAMProduction chat
CPU+GPU hybridModel exceeds VRAMFlexiblePCIe/RAM impact
03
Server features

Use dedicated llama-server instances for different inference roles

The runtime supports chat, embeddings and reranking, but production often benefits from separate instances for different models and latency profiles.

Chat/completions
Embeddings
Reranking
Parallel slots
Metrics
API key
04
Server checks

Start llama-server on localhost and verify the API

Replace the model reference with your GGUF model.

Command 1
llama-server -hf ggml-org/Qwen3.5-0.8B-GGUF --host 127.0.0.1 --port 8080
Command 2
curl -s http://127.0.0.1:8080/v1/models | head
Command 3
curl -s http://127.0.0.1:8080/health | head
Command 4
ps aux | grep '[l]lama-server'
Command 5
ss -lntp | grep ':8080'
05
Public API boundary

Use reverse proxy and rate limits even when API keys are enabled

The built-in API key provides basic authentication; Internet-facing production needs TLS, rate limits, request-size limits, access logging and tenant quotas.

Local/private bind
TLS proxy
API key
Rate limit
Request-size limit
Protect metrics endpoints
Official documentation

Official sources

llama.cppRepositorygithub.comllama.cppHTTP Servergithub.com
FAQ

Frequently asked questions

Does llama.cpp support the OpenAI API?

Yes. Current llama-server docs list OpenAI-compatible chat completions, responses and embeddings routes.

Can llama.cpp serve rerankers?

Yes. Current server docs include reranking endpoints and a dedicated reranking mode.

Does GGUF quantization affect quality?

More aggressive quantization reduces memory but can reduce quality depending on model/task; benchmark it.

EKA YAZILIM VE BİLİŞİM SİSTEMLERİ

Size llama.cpp by quantization, context and CPU/GPU offload

Share GGUF model, quantization, context, CPU/RAM, GPU/VRAM and users; we can design full-GPU or hybrid serving.

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