FastChat

FastChatSince 2026-08

FastChat is an open-source platform developed by LMSYS (Large Model Systems Organization) for training, serving, and evaluating large language model-based chatbots. As the technology powering the popular Chatbot Arena leaderboard, FastChat provides state-of-the-art serving infrastructure with OpenAI-compatible REST APIs, distributed worker orchestration, and Web UI interfaces. Machine learning engineers and enterprise developers use FastChat to self-host open-weights models (like Llama 3, Mistral, Vicuna, and DeepSeek) with multi-GPU acceleration and vLLM integration.

FastChat provides an end-to-end stack: high-throughput model serving workers, a central controller for load balancing across GPU nodes, and an OpenAI-compatible API server. It also includes comprehensive fine-tuning recipes using Hugging Face Transformers, DeepSpeed, and FlashAttention-2. FastChat is the gold standard foundation for organizations establishing sovereign, on-premise AI chat and API infrastructure.

OllamaSince 2023-01

Ollama allows users to run large language models directly on their local hardware, providing privacy and speed without relying on cloud services. It supports a variety of models and is optimized for both CPU and GPU usage. The tool is ideal for developers and researchers who need offline access to AI capabilities.

Ollama simplifies the deployment of LLMs by providing a straightforward interface for local execution. The company focuses on making AI accessible and efficient for individual and enterprise use.