GLM 5.3 Flash

GLM 5.3 Flash is a very low-cost open model from Z.ai, released 2026-08-26 under the MIT licence, with a 1,048,576-token context and text, image and video input. OpenRouter lists $0.0197 per million input tokens and $0.1324 output, which is very low, and a FlashX variant costs $0.37 and $1.25 for faster serving. MIT is a standard permissive licence, so commercial use is clear. We would suggest it for bulk processing of long documents, cheap routing steps, and experiments where cost matters more than top quality. The limit is that a cheap model of this kind is the wrong one for difficult reasoning, and that we have no tests of its output. Our GLM page has the vendor's scores and hardware notes. Prices and specifications come from the OpenRouter listing we checked on 31 October 2026, and we have not tested the model ourselves.