StepFun

Open, low-cost chat with strong reasoning. Free to use.

DeepSeek's assistant — chat with a reasoning mode and web search, backed by the open-weight DeepSeek models that reset the cost curve for frontier-grade quality.

Moonshot's assistant — long-context chat, deep research, and agents.

Moonshot AI's assistant — long-context chat, Deep Research, and an agent mode (Kimi Code, parallel subagents). Built on the open-weight Kimi K2 model family.

Zhipu's GLM assistant — frontier open-weight chat, free to use.

Z.ai is the international assistant of Zhipu AI, built on the GLM model family. The free chat runs the flagship GLM-5 and GLM-5.1 models with reasoning and agentic modes, and the same models are served to developers over a low-cost, OpenAI-compatible API. GLM-5's open weights ship under the MIT license.