diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index 222d24370..13686d399 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -72,6 +72,9 @@
 ### Fixed
 
 - Fixed Agent Hub parking a mid-spawn child JSONL (title + session header only) so `task` then fails with `already owned by another session generation` and the row cannot be revived.
+### Fixed
+
+- Fixed the welcome banner displaying a stale model name when the session's active model changes after startup (e.g. after a delayed config load or an explicit `/model` switch). The banner now subscribes to `model_changed` events and calls `WelcomeComponent.setModel()`, which already existed but was never wired up.
 
 ## [17.3.0] - 2026-08-13
 
diff --git a/packages/coding-agent/src/modes/interactive-mode.ts b/packages/coding-agent/src/modes/interactive-mode.ts
index 88c0d14dc..4baf76c67 100644
--- a/packages/coding-agent/src/modes/interactive-mode.ts
+++ b/packages/coding-agent/src/modes/interactive-mode.ts
@@ -1177,6 +1177,9 @@ export class InteractiveMode implements InteractiveModeContext {
 
 		this.#eventBusUnsubscribers.push(
 			this.session.subscribe(event => {
+				if (event.type === "model_changed") {
+					this.#updateWelcomeModel();
+				}
 				void this.#handleGoalSessionEvent(event);
 			}),
 			onStatusLineSessionAccentChanged(() => {
@@ -1184,6 +1187,11 @@ export class InteractiveMode implements InteractiveModeContext {
 				this.#handleSessionAccentInputsChanged();
 			}),
 		);
+		// Resync the welcome banner to the live model: init-time reconciliations
+		// (#reconcileModeFromSession, #enterPlanMode for plan.defaultOnStartup)
+		// can change the model before this subscription exists, so the
+		// model_changed events they emit are never observed by the handler above.
+		this.#updateWelcomeModel();
 		this.#eventBusUnsubscribers.push(
 			onModelRolesChanged(() => {
 				void this.#reapplyPlanModeModelOnRoleChange();
@@ -4430,6 +4438,18 @@ export class InteractiveMode implements InteractiveModeContext {
 		);
 	}
 
+	#updateWelcomeModel(): void {
+		if (!this.#welcomeComponent) {
+			return;
+		}
+
+		this.#welcomeComponent.setModel(
+			this.session.model?.name ?? "Unknown",
+			this.session.model?.provider ?? "Unknown",
+		);
+		this.ui.requestRender();
+	}
+
 	#updateWelcomeLspServers(): void {
 		if (!this.#welcomeComponent) {
 			return;
diff --git a/packages/coding-agent/test/modes/components/welcome.test.ts b/packages/coding-agent/test/modes/components/welcome.test.ts
index f1d5997d1..bb8adfec2 100644
--- a/packages/coding-agent/test/modes/components/welcome.test.ts
+++ b/packages/coding-agent/test/modes/components/welcome.test.ts
@@ -62,3 +62,43 @@ describe("WelcomeComponent tips", () => {
 		expect(pickWeightedTip([], 0.5)).toBe("");
 	});
 });
+
+// Regression coverage for the stale welcome banner bug: the component is
+// constructed with the session model at init time, but init-time model changes
+// (plan.defaultOnStartup, #reconcileModeFromSession, delayed config load) can
+// swap the model before the model_changed subscription exists. The catch-up
+// resync in InteractiveMode.init() calls setModel() after those steps; these
+// tests verify setModel() produces the correct rendered output.
+describe("WelcomeComponent model name", () => {
+	beforeAll(async () => {
+		await Settings.init({ inMemory: true });
+		await initTheme(false);
+	});
+
+	it("updates the rendered model name after setModel()", () => {
+		const welcome = new WelcomeComponent("1.0.0", "DeepSeek V4 Pro", "deepseek");
+		const before = welcome.render(100).join("\n");
+		expect(before).toContain("DeepSeek V4 Pro");
+
+		welcome.setModel("GLM-5.2", "zhipu-coding-plan");
+		const after = welcome.render(100).join("\n");
+		expect(after).toContain("GLM-5.2");
+		expect(after).not.toContain("DeepSeek V4 Pro");
+	});
+
+	it("resyncs to the live model after init-time model switches (catch-up path)", () => {
+		// Banner constructed with the pre-config fallback model (the startup race
+		// picks an alphabetically-first provider before modelRoles.default loads).
+		const welcome = new WelcomeComponent("1.0.0", "DeepSeek V4 Pro", "deepseek");
+		expect(welcome.render(100).join("\n")).toContain("DeepSeek V4 Pro");
+
+		// Config loads, session switches to the real default — the model_changed
+		// event fires before the subscription exists, so InteractiveMode.init()
+		// calls setModel() explicitly as a catch-up resync.
+		welcome.setModel("GLM-5.2", "zhipu-coding-plan");
+		const rendered = welcome.render(100).join("\n");
+		expect(rendered).toContain("GLM-5.2");
+		expect(rendered).toContain("zhipu-coding-plan");
+		expect(rendered).not.toContain("DeepSeek");
+	});
+});