Reasoning

DeepSeek

Hangzhou lab shipping MIT-licensed V4 models and a very cheap API

Orca

Microsoft Research's explanation-tuned small models, now a dated research release

SenseNova 日日新

SenseTime's multimodal agent models, open image models and a free-beta Token Plan

StepFun 阶跃AI (formerly Yuewen 跃问)

StepFun's free AI assistant and agent app, renamed from Yuewen