diff --git a/web/public/locales/en/views/settings.json b/web/public/locales/en/views/settings.json
index 7bb582120b..ec37ca7f17 100644
--- a/web/public/locales/en/views/settings.json
+++ b/web/public/locales/en/views/settings.json
@@ -1543,6 +1543,9 @@
       "builtIn": "Built-in Models",
       "genaiProviders": "GenAI Providers"
     },
+    "semanticSearchModelSize": {
+      "notApplicable": "Not applicable for GenAI providers"
+    },
     "review": {
       "title": "Review Settings"
     },
@@ -1820,8 +1823,7 @@
       "mixedTypesSuggestion": "All detectors must use the same type. Remove existing detectors or select {{type}}."
     },
     "semanticSearch": {
-      "jinav2SmallModelSize": "The 'small' size with the Jina V2 model has high RAM and inference cost. The 'large' model with a discrete GPU is recommended.",
-      "modelSizeIgnoredForProvider": "Model size only applies to the built-in Jina models. This value will be ignored when using a GenAI embedding provider."
+      "jinav2SmallModelSize": "The 'small' size with the Jina V2 model has high RAM and inference cost. The 'large' model with a discrete GPU is recommended."
     }
   }
 }
diff --git a/web/src/components/config-form/LiveFormDataContext.ts b/web/src/components/config-form/LiveFormDataContext.ts
new file mode 100644
index 0000000000..10d9a3e82c
--- /dev/null
+++ b/web/src/components/config-form/LiveFormDataContext.ts
@@ -0,0 +1,13 @@
+import { createContext } from "react";
+import type { ConfigSectionData } from "@/types/configForm";
+
+// Mirrors the current section's in-flight form data so widgets can react
+// to changes that RJSF wouldn't otherwise re-render them for. RJSF's
+// Form memoizes SchemaField via deep equality and, in some transitions
+// (notably reverting a field to its saved value), can skip re-rendering
+// a widget even though the form data it depends on changed. useContext
+// re-runs consumers directly on every provider value update, sidestepping
+// that.
+export const LiveFormDataContext = createContext<ConfigSectionData | null>(
+  null,
+);
diff --git a/web/src/components/config-form/section-configs/semantic_search.ts b/web/src/components/config-form/section-configs/semantic_search.ts
index 3f9bbfaec1..dde2b75531 100644
--- a/web/src/components/config-form/section-configs/semantic_search.ts
+++ b/web/src/components/config-form/section-configs/semantic_search.ts
@@ -29,28 +29,13 @@ const semanticSearch: SectionConfigOverrides = {
           ctx.formData?.model === "jinav2" &&
           ctx.formData?.model_size === "small",
       },
-      {
-        key: "model-size-ignored-for-provider",
-        field: "model_size",
-        messageKey: "configMessages.semanticSearch.modelSizeIgnoredForProvider",
-        severity: "info",
-        position: "after",
-        condition: (ctx) => {
-          const model = ctx.formData?.model;
-          return (
-            typeof model === "string" &&
-            model !== "" &&
-            model !== "jinav1" &&
-            model !== "jinav2"
-          );
-        },
-      },
     ],
     uiSchema: {
       model: {
         "ui:widget": "semanticSearchModel",
       },
       model_size: {
+        "ui:widget": "semanticSearchModelSize",
         "ui:options": { size: "xs", enumI18nPrefix: "modelSize" },
       },
     },
diff --git a/web/src/components/config-form/sections/BaseSection.tsx b/web/src/components/config-form/sections/BaseSection.tsx
index 4fbdf76625..b3261a5cc4 100644
--- a/web/src/components/config-form/sections/BaseSection.tsx
+++ b/web/src/components/config-form/sections/BaseSection.tsx
@@ -87,6 +87,7 @@ import type {
 import { useConfigMessages } from "@/hooks/use-config-messages";
 import { ConfigMessageBanner } from "../ConfigMessageBanner";
 import { FieldMessagesContext } from "../FieldMessagesContext";
+import { LiveFormDataContext } from "../LiveFormDataContext";
 
 export interface SectionConfig {
   /** Field ordering within the section */
@@ -998,59 +999,63 @@ export function ConfigSection({
     <div className="space-y-6">
       <ConfigMessageBanner messages={activeMessages} />
       <FieldMessagesContext.Provider value={activeFieldMessages}>
-        <ConfigForm
-          key={formKey}
-          schema={modifiedSchema}
-          formData={currentFormData}
-          onChange={handleChange}
-          onValidationChange={setHasValidationErrors}
-          fieldOrder={sectionConfig.fieldOrder}
-          fieldGroups={sectionConfig.fieldGroups}
-          hiddenFields={effectiveHiddenFields}
-          advancedFields={sectionConfig.advancedFields}
-          liveValidate={sectionConfig.liveValidate}
-          uiSchema={sectionConfig.uiSchema}
-          disabled={disabled || isSaving}
-          readonly={readonly}
-          showSubmit={false}
-          i18nNamespace={configNamespace}
-          customValidate={customValidate}
-          formContext={{
-            level: effectiveLevel,
-            cameraName,
-            globalValue,
-            cameraValue,
-            hasChanges,
-            extraHasChanges,
-            setExtraHasChanges,
-            overrides: uiOverrides as JsonValue | undefined,
-            formData: currentFormData as ConfigSectionData,
-            baselineFormData: effectiveBaselineFormData as ConfigSectionData,
-            pendingDataBySection,
-            onPendingDataChange,
-            onFormDataChange: (data: ConfigSectionData) => handleChange(data),
-            // For widgets that need access to full camera config (e.g., zone names)
-            fullCameraConfig:
-              effectiveLevel === "camera" && cameraName
-                ? config?.cameras?.[cameraName]
-                : undefined,
-            fullConfig: config,
-            // When rendering camera-level sections, provide the section path so
-            // field templates can look up keys under the `config/cameras` namespace
-            // When using a consolidated global namespace, keys are nested
-            // under the section name (e.g., `audio.label`) so provide the
-            // section prefix to templates so they can attempt `${section}.${field}` lookups.
-            sectionI18nPrefix: sectionPath,
-            t,
-            renderers: wrappedRenderers,
-            sectionDocs: sectionConfig.sectionDocs,
-            fieldDocs: sectionConfig.fieldDocs,
-            hiddenFields: effectiveHiddenFields,
-            restartRequired: sectionConfig.restartRequired,
-            requiresRestart,
-            isProfile: !!profileName,
-          }}
-        />
+        <LiveFormDataContext.Provider
+          value={(currentFormData as ConfigSectionData | null) ?? null}
+        >
+          <ConfigForm
+            key={formKey}
+            schema={modifiedSchema}
+            formData={currentFormData}
+            onChange={handleChange}
+            onValidationChange={setHasValidationErrors}
+            fieldOrder={sectionConfig.fieldOrder}
+            fieldGroups={sectionConfig.fieldGroups}
+            hiddenFields={effectiveHiddenFields}
+            advancedFields={sectionConfig.advancedFields}
+            liveValidate={sectionConfig.liveValidate}
+            uiSchema={sectionConfig.uiSchema}
+            disabled={disabled || isSaving}
+            readonly={readonly}
+            showSubmit={false}
+            i18nNamespace={configNamespace}
+            customValidate={customValidate}
+            formContext={{
+              level: effectiveLevel,
+              cameraName,
+              globalValue,
+              cameraValue,
+              hasChanges,
+              extraHasChanges,
+              setExtraHasChanges,
+              overrides: uiOverrides as JsonValue | undefined,
+              formData: currentFormData as ConfigSectionData,
+              baselineFormData: effectiveBaselineFormData as ConfigSectionData,
+              pendingDataBySection,
+              onPendingDataChange,
+              onFormDataChange: (data: ConfigSectionData) => handleChange(data),
+              // For widgets that need access to full camera config (e.g., zone names)
+              fullCameraConfig:
+                effectiveLevel === "camera" && cameraName
+                  ? config?.cameras?.[cameraName]
+                  : undefined,
+              fullConfig: config,
+              // When rendering camera-level sections, provide the section path so
+              // field templates can look up keys under the `config/cameras` namespace
+              // When using a consolidated global namespace, keys are nested
+              // under the section name (e.g., `audio.label`) so provide the
+              // section prefix to templates so they can attempt `${section}.${field}` lookups.
+              sectionI18nPrefix: sectionPath,
+              t,
+              renderers: wrappedRenderers,
+              sectionDocs: sectionConfig.sectionDocs,
+              fieldDocs: sectionConfig.fieldDocs,
+              hiddenFields: effectiveHiddenFields,
+              restartRequired: sectionConfig.restartRequired,
+              requiresRestart,
+              isProfile: !!profileName,
+            }}
+          />
+        </LiveFormDataContext.Provider>
       </FieldMessagesContext.Provider>
 
       {!embedded && (
diff --git a/web/src/components/config-form/theme/frigateTheme.ts b/web/src/components/config-form/theme/frigateTheme.ts
index ae612d9ac7..ebc6b19b35 100644
--- a/web/src/components/config-form/theme/frigateTheme.ts
+++ b/web/src/components/config-form/theme/frigateTheme.ts
@@ -31,6 +31,7 @@ import { TimezoneSelectWidget } from "./widgets/TimezoneSelectWidget";
 import { CameraPathWidget } from "./widgets/CameraPathWidget";
 import { OptionalFieldWidget } from "./widgets/OptionalFieldWidget";
 import { SemanticSearchModelWidget } from "./widgets/SemanticSearchModelWidget";
+import { SemanticSearchModelSizeWidget } from "./widgets/SemanticSearchModelSizeWidget";
 import { OnvifProfileWidget } from "./widgets/OnvifProfileWidget";
 
 import { FieldTemplate } from "./templates/FieldTemplate";
@@ -86,6 +87,7 @@ export const frigateTheme: FrigateTheme = {
     timezoneSelect: TimezoneSelectWidget,
     optionalField: OptionalFieldWidget,
     semanticSearchModel: SemanticSearchModelWidget,
+    semanticSearchModelSize: SemanticSearchModelSizeWidget,
     onvifProfile: OnvifProfileWidget,
   },
   templates: {
diff --git a/web/src/components/config-form/theme/widgets/SemanticSearchModelSizeWidget.tsx b/web/src/components/config-form/theme/widgets/SemanticSearchModelSizeWidget.tsx
new file mode 100644
index 0000000000..4ee0019363
--- /dev/null
+++ b/web/src/components/config-form/theme/widgets/SemanticSearchModelSizeWidget.tsx
@@ -0,0 +1,57 @@
+// Disables model_size and shows "N/A" when a GenAI provider is selected.
+// Reads model via LiveFormDataContext so it re-runs even when RJSF's
+// SchemaField memoization would skip this widget.
+import type { WidgetProps } from "@rjsf/utils";
+import { useContext, useEffect } from "react";
+import { useTranslation } from "react-i18next";
+import {
+  Select,
+  SelectContent,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
+import { LiveFormDataContext } from "../../LiveFormDataContext";
+import { getSizedFieldClassName } from "../utils";
+import { SelectWidget } from "./SelectWidget";
+
+export function SemanticSearchModelSizeWidget(props: WidgetProps) {
+  const { t } = useTranslation(["views/settings"]);
+  const liveFormData = useContext(LiveFormDataContext);
+  const model = liveFormData?.model;
+  const isProvider =
+    typeof model === "string" &&
+    model !== "" &&
+    model !== "jinav1" &&
+    model !== "jinav2";
+
+  // Clear model_size while on a provider (buildOverrides converts to ""
+  // which the backend treats as "remove"). Restore the schema default
+  // when returning to a Jina model so the field isn't left empty.
+  const { value, onChange, schema } = props;
+  const schemaDefault = schema?.default as string | undefined;
+  useEffect(() => {
+    if (isProvider && value !== undefined) {
+      onChange(undefined);
+    } else if (!isProvider && value === undefined && schemaDefault) {
+      onChange(schemaDefault);
+    }
+  }, [isProvider, value, onChange, schemaDefault]);
+
+  if (isProvider) {
+    const fieldClassName = getSizedFieldClassName(props.options ?? {}, "sm");
+    return (
+      <Select value="" disabled>
+        <SelectTrigger className={fieldClassName}>
+          <SelectValue
+            placeholder={t("configForm.semanticSearchModelSize.notApplicable", {
+              defaultValue: "Not applicable for GenAI providers",
+            })}
+          />
+        </SelectTrigger>
+        <SelectContent />
+      </Select>
+    );
+  }
+
+  return <SelectWidget {...props} />;
+}