- **Breaking:** the maintained Z.ai Coding catalog now contains only GLM 5.3 and GLM 5.3 Flash. `KnownModels` no longer advertises legacy Coding Plan models, and `LookupModel` no longer supplies their context or reasoning metadata. Move Coding Plan configuration to `glm-5.3` or `glm-5.3-flash`. - GLM 5.3 retains validated low, high, and max reasoning effort controls. GLM 5.3 Flash preserves tool-loop thinking but does not advertise numeric or disabling controls.