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FastChat vs. Qwen

LLM Comparison


FastChat

FastChat

Overview

FastChat is the open platform for training, serving, and evaluating LLM chatbots developed and maintained by LMSYS.


FastChat is an open-source library for training, serving, and evaluating LLM chat systems from LMSYS. It includes training and evaluation code, a model serving system, a Web GUI, and a finetuning pipeline, and is the de facto system for Vicuna as well as FastChat-T5. FastChat also includes the Chatbot Arena for benchmarking LLMs.


Initial release: 2023-04-28

Qwen

Qwen

Overview

Qwen is Alibaba Cloud's family of large language models, including chat models, code models, and multimodal variants. Qwen 3 and QwQ are the latest releases, with strong reasoning capabilities.


Qwen (formerly Tongyi Qianwen) is a comprehensive family of large language models developed by Alibaba Cloud. The series includes base models, chat models, code-specific variants (CodeQwen), and multimodal models (Qwen-VL). Qwen models excel at multilingual tasks and have become particularly popular in Asia. The latest releases include Qwen 3 and QwQ (focused on reasoning), competing effectively with Western counterparts while offering strong Chinese language support.


Initial release: 2023-09-13

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FastChat

Qwen

Products & Features
Instruct Models
Coding Capability
Customization
Finetuning
Open Source
License Apache 2.0 Custom
Model Sizes 3B 0.5B, 1.5B, 3B, 7B, 14B, 32B, 72B