kitio.aiFaiss vs llama.cpp
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Faiss starts at Free and llama.cpp starts at Free. Check both pricing pages for current plans.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Nearest neighbor search
- Clustering
- GPU algorithms
- Python wrappers
- Indexes larger than RAM
- Evaluation tools
- GGUF format
- Low-bit quantization
- Many GPU backends
- OpenAI-compatible server
- Built-in web UI
| Feature | Faiss | llama.cpp |
|---|---|---|
| Best for | Open-source library for similarity search over dense vectors | C/C++ engine for running LLMs efficiently on CPUs and GPUs |
| Category | Models & APIs | Models & APIs |
| Pricing model | Free | Free |
| Starting price | Free | Free |
| Free plan | Yes, fully free | Yes, fully free |
| Made by | Meta FAIR | ggml-org |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Faiss starts at Free and llama.cpp starts at Free. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Faiss
- Free and open source
- Scales past available memory
- GPU support for key algorithms
- A library, not a managed service
- Needs engineering effort to deploy
- Not a database, so no built-in server or storage
llama.cpp
- Runs on modest hardware
- Very fast new-model support
- Foundation of many apps
- Command-line heavy
- Build options can confuse
- Less suited to high-concurrency serving
Which one should you choose?
Choose Faiss if you want:
- Free and open source
- Scales past available memory
- GPU support for key algorithms
Watch out: a library, not a managed service.
Choose llama.cpp if you want:
- Runs on modest hardware
- Very fast new-model support
- Foundation of many apps
Watch out: command-line heavy.
Faiss vs llama.cpp FAQ
What is the difference between Faiss and llama.cpp?
Faiss: Open-source library for similarity search over dense vectors. llama.cpp: C/C++ engine for running LLMs efficiently on CPUs and GPUs. Both are models & apis tools.
Is Faiss or llama.cpp cheaper?
Faiss starts at Free and llama.cpp starts at Free. Check both pricing pages for current plans.
Do Faiss and llama.cpp have free plans?
Faiss: Yes, fully free. llama.cpp: Yes, fully free.
Who makes Faiss?
Faiss is made by Meta FAIR, based in United States.
Who makes llama.cpp?
llama.cpp is made by ggml-org.
Which should I choose, Faiss or llama.cpp?
Choose Faiss if you value free and open source and scales past available memory. Choose llama.cpp if you value runs on modest hardware and very fast new-model support.