BigModel
Z.ai (Zhipu AI)
GLM-4.7-Flash and other Flash-series models are permanently free; new users also get 20 million tokens on signup
Free Flash models include text models (GLM-4.7-Flash / GLM-4-Flash-250414) and multimodal models (GLM-4.6V-Flash / GLM-4.1V-Thinking-Flash). GLM-4.7-Flash has a 200K context window and 128K max output. Referring friends who complete real-name signup can accumulate up to a 200-million-token bundle (a promotional program).
GLM-4.7-FlashGLM-4-Flash-250414GLM-4.6V-FlashGLM-4.1V-Thinking-FlashGLM-5.3
Free Flash-tier model names get replaced over iterations (e.g. glm-4.5-flash was retired on 2026-01-30 and now auto-routes to glm-4.7-flash) — watch for whether the model alias you're integrating with has been switched by the vendor.