diff --git a/extensions/ql-vscode/src/common/interface-types.ts b/extensions/ql-vscode/src/common/interface-types.ts
index cc7c60f16..e27b8bb3b 100644
--- a/extensions/ql-vscode/src/common/interface-types.ts
+++ b/extensions/ql-vscode/src/common/interface-types.ts
@@ -590,6 +590,14 @@ interface StopGeneratingMethodsFromLlmMessage {
   packageName: string;
 }
 
+interface StartModelEvaluationMessage {
+  t: "startModelEvaluation";
+}
+
+interface StopModelEvaluationMessage {
+  t: "stopModelEvaluation";
+}
+
 interface ModelDependencyMessage {
   t: "modelDependency";
 }
@@ -648,7 +656,9 @@ export type FromModelEditorMessage =
   | StopGeneratingMethodsFromLlmMessage
   | ModelDependencyMessage
   | HideModeledMethodsMessage
-  | SetMultipleModeledMethodsMessage;
+  | SetMultipleModeledMethodsMessage
+  | StartModelEvaluationMessage
+  | StopModelEvaluationMessage;
 
 interface RevealInEditorMessage {
   t: "revealInModelEditor";
diff --git a/extensions/ql-vscode/src/config.ts b/extensions/ql-vscode/src/config.ts
index 50937cf15..9aa54ad33 100644
--- a/extensions/ql-vscode/src/config.ts
+++ b/extensions/ql-vscode/src/config.ts
@@ -715,6 +715,7 @@ const LLM_GENERATION_DEV_ENDPOINT = new Setting(
   "llmGenerationDevEndpoint",
   MODEL_SETTING,
 );
+const MODEL_EVALUATION = new Setting("evaluation", MODEL_SETTING);
 const EXTENSIONS_DIRECTORY = new Setting("extensionsDirectory", MODEL_SETTING);
 const ENABLE_PYTHON = new Setting("enablePython", MODEL_SETTING);
 const ENABLE_ACCESS_PATH_SUGGESTIONS = new Setting(
@@ -759,6 +760,10 @@ export class ModelConfigListener extends ConfigListener implements ModelConfig {
     return LLM_GENERATION_DEV_ENDPOINT.getValue<string | undefined>();
   }
 
+  public get modelEvaluation(): boolean {
+    return !!MODEL_EVALUATION.getValue<boolean>();
+  }
+
   public getExtensionsDirectory(languageId: string): string | undefined {
     return EXTENSIONS_DIRECTORY.getValue<string>({
       languageId,
diff --git a/extensions/ql-vscode/src/model-editor/model-editor-view.ts b/extensions/ql-vscode/src/model-editor/model-editor-view.ts
index 2c1e886ee..393e09673 100644
--- a/extensions/ql-vscode/src/model-editor/model-editor-view.ts
+++ b/extensions/ql-vscode/src/model-editor/model-editor-view.ts
@@ -337,6 +337,12 @@ export class ModelEditorView extends AbstractWebview<
         this.setModeledMethods(msg.methodSignature, msg.modeledMethods);
         break;
       }
+      case "startModelEvaluation":
+        this.startModelEvaluation();
+        break;
+      case "stopModelEvaluation":
+        this.stopModelEvaluation();
+        break;
       case "telemetry":
         telemetryListener?.sendUIInteraction(msg.action);
         break;
@@ -402,6 +408,8 @@ export class ModelEditorView extends AbstractWebview<
     const showLlmButton =
       this.databaseItem.language === "java" && this.modelConfig.llmGeneration;
 
+    const showEvaluationUi = this.modelConfig.modelEvaluation;
+
     const sourceArchiveAvailable =
       this.databaseItem.hasSourceArchiveInExplorer();
 
@@ -416,6 +424,7 @@ export class ModelEditorView extends AbstractWebview<
         language: this.language,
         showGenerateButton,
         showLlmButton,
+        showEvaluationUi,
         mode: this.modelingStore.getMode(this.databaseItem),
         showModeSwitchButton,
         sourceArchiveAvailable,
@@ -910,4 +919,12 @@ export class ModelEditorView extends AbstractWebview<
     );
     this.modelingStore.addModifiedMethod(this.databaseItem, signature);
   }
+
+  private startModelEvaluation() {
+    // Do nothing for now. This will be fleshed out in the near future.
+  }
+
+  private stopModelEvaluation() {
+    // Do nothing for now. This will be fleshed out in the near future.
+  }
 }
diff --git a/extensions/ql-vscode/src/model-editor/shared/view-state.ts b/extensions/ql-vscode/src/model-editor/shared/view-state.ts
index 3e962b599..111019e30 100644
--- a/extensions/ql-vscode/src/model-editor/shared/view-state.ts
+++ b/extensions/ql-vscode/src/model-editor/shared/view-state.ts
@@ -7,6 +7,7 @@ export interface ModelEditorViewState {
   language: QueryLanguage;
   showGenerateButton: boolean;
   showLlmButton: boolean;
+  showEvaluationUi: boolean;
   mode: Mode;
   showModeSwitchButton: boolean;
   sourceArchiveAvailable: boolean;
diff --git a/extensions/ql-vscode/src/view/model-editor/ModelEditor.tsx b/extensions/ql-vscode/src/view/model-editor/ModelEditor.tsx
index d7c9a70cb..fd775551f 100644
--- a/extensions/ql-vscode/src/view/model-editor/ModelEditor.tsx
+++ b/extensions/ql-vscode/src/view/model-editor/ModelEditor.tsx
@@ -74,6 +74,50 @@ const ButtonsContainer = styled.div`
   margin-top: 1rem;
 `;
 
+const ModelEvaluation = ({
+  viewState,
+  modeledMethods,
+  modifiedSignatures,
+  onStartEvaluation,
+  onStopEvaluation,
+  evaluationInProgress,
+}: {
+  viewState: ModelEditorViewState;
+  modeledMethods: Record<string, ModeledMethod[]>;
+  modifiedSignatures: Set<string>;
+  onStartEvaluation: () => void;
+  onStopEvaluation: () => void;
+  evaluationInProgress: boolean;
+}) => {
+  if (!viewState.showEvaluationUi) {
+    return null;
+  }
+
+  if (!evaluationInProgress) {
+    const customModelsExist = Object.values(modeledMethods).some(
+      (methods) => methods.filter((m) => m.type !== "none").length > 0,
+    );
+
+    const unsavedChanges = modifiedSignatures.size > 0;
+
+    return (
+      <VSCodeButton
+        onClick={onStartEvaluation}
+        appearance="secondary"
+        disabled={!customModelsExist || unsavedChanges}
+      >
+        Evaluate
+      </VSCodeButton>
+    );
+  } else {
+    return (
+      <VSCodeButton onClick={onStopEvaluation} appearance="secondary">
+        Stop evaluation
+      </VSCodeButton>
+    );
+  }
+};
+
 type Props = {
   initialViewState?: ModelEditorViewState;
   initialMethods?: Method[];
@@ -114,6 +158,8 @@ export function ModelEditor({
     string | null
   >(null);
 
+  const [evaluationInProgress, setEvaluationInProgress] = useState(false);
+
   useEffect(() => {
     vscode.postMessage({
       t: "hideModeledMethods",
@@ -254,6 +300,20 @@ export function ModelEditor({
     [selectedSignatures],
   );
 
+  const onStartEvaluation = useCallback(() => {
+    setEvaluationInProgress(true);
+    vscode.postMessage({
+      t: "startModelEvaluation",
+    });
+  }, []);
+
+  const onStopEvaluation = useCallback(() => {
+    setEvaluationInProgress(false);
+    vscode.postMessage({
+      t: "stopModelEvaluation",
+    });
+  }, []);
+
   const onGenerateFromSourceClick = useCallback(() => {
     vscode.postMessage({
       t: "generateMethod",
@@ -373,6 +433,14 @@ export function ModelEditor({
                     Generate
                   </VSCodeButton>
                 )}
+              <ModelEvaluation
+                viewState={viewState}
+                modeledMethods={modeledMethods}
+                modifiedSignatures={modifiedSignatures}
+                onStartEvaluation={onStartEvaluation}
+                onStopEvaluation={onStopEvaluation}
+                evaluationInProgress={evaluationInProgress}
+              />
             </ButtonsContainer>
           </HeaderRow>
         </HeaderColumn>
diff --git a/extensions/ql-vscode/test/factories/model-editor/view-state.ts b/extensions/ql-vscode/test/factories/model-editor/view-state.ts
index 8cb933ad9..06a40da5a 100644
--- a/extensions/ql-vscode/test/factories/model-editor/view-state.ts
+++ b/extensions/ql-vscode/test/factories/model-editor/view-state.ts
@@ -11,6 +11,7 @@ export function createMockModelEditorViewState(
     mode: Mode.Application,
     showGenerateButton: false,
     showLlmButton: false,
+    showEvaluationUi: false,
     showModeSwitchButton: true,
     extensionPack: createMockExtensionPack(),
     sourceArchiveAvailable: true,