HuggingChat (Hugging Face's official free chat interface, 136 open-source models to choose from)

Usable after logging in with a free Hugging Face account; the page lists 136 selectable open-source models in real time, plus Omni auto-routing (no need to pick a model yourself — the system automatically selects the best model to answer your question)

Verified 2026-08-29: the official page (huggingface.co/chat) is confirmed still running normally, with GLM-5.3-Flash (Z.ai's 320B mixture-of-experts multimodal model) newly added. The vendor hasn't published a clear daily message cap; the paid PRO tier ($9/month) mainly offers faster response speed and higher compute priority, not access to more models.

⚠️There have been rumors that HuggingChat was taken down or discontinued; directly verified on 2026-08-29 that the official site is still operating normally. All models are open-source (not closed-source flagships like GPT/Claude/Gemini) — well-suited to scenarios where you want to freely use a full range of open-source models and compare their output.