feat(ai): add Z.AI GLM-5.3

packages/ai/CHANGELOG.md

@@ -10,6 +10,8 @@
 
 ### Fixed
 
+- Preserve GLM-5.3 Flash and Highspeed reasoning effort mappings and Z.AI thinking serialization.
+
 ### Removed
 
 ## [2026.8.29] - 2026-08-29

packages/ai/changes.md

@@ -1,5 +1,27 @@
 # changes.md — ai
 
+## 2026-08-29 - Preserve GLM-5.3 variant reasoning controls
+
+### What changed
+
+- `packages/ai/scripts/generate-models.ts`: recognize `glm-5.3` Flash and Highspeed variants as part of the Z.AI GLM-5.3 family so generated metadata retains low/high/max reasoning effort mappings and wire support.
+
+### Why
+
+- Without family matching, explicit reasoning effort selections were dropped for the Flash and Highspeed models and their model controls exposed incorrect levels.
+
+### Why an extension could not handle it
+
+- Model-family metadata and request serialization are built into the AI package generator and provider adapter before extension code can intervene.
+
+### Expected merge conflict zones
+
+- `packages/ai/scripts/generate-models.ts`: Z.AI model-family detection and generated capability metadata.
+
+## 2026-08-29 - Z.AI GLM-5.3 request and catalog fixes
+
+- GLM-5.3 reasoning-off requests now use the provider's lowest enabled effort instead of sending the rejected disabled-thinking payload; regenerated Z.AI catalogs retain the separate global and China sources and published model metadata.
+
 ## Credential pool export wildcard (2026-08-27)
 
 ### What changed

packages/ai/scripts/generate-models.ts

@@ -1930,7 +1930,7 @@ async function loadModelsDevData(): Promise<Model<any>[]> {
 				const supportsImage = m.modalities?.input?.includes("image");
 
 				const isGlm52 = modelId === "glm-5.2" || modelId === "glm-5.2-highspeed";
-				const isGlm5x = isGlm52 || modelId === "glm-5.3";
+				const isGlm5x = isGlm52 || /^(?:glm-5\.3)(?:$|-)/.test(modelId);
 				const referenceCost = modelId === "glm-5.2-highspeed" ? undefined : data.zai?.models[modelId]?.cost ?? m.cost;
 
 				models.push({

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