diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index 4e3ee9000..1445eed3c 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -121,6 +121,7 @@
 - Fixed `/rename` title arguments treating `#` prompt-action tokens as autocomplete triggers instead of literal text.
 - Fixed empty session `.jsonl` files accumulating in the sessions directory after a draft-then-clear exit cycle.
 - Fixed advisor being disabled for the entire session when resolving to a reasoning model with no controllable effort surface (e.g., `devin/glm-5-2*`).
+- Fixed live advisors continuing to use a stale `modelRoles.advisor` selection after `/model` changed the advisor model. ([#4612](https://github.com/can1357/oh-my-pi/issues/4612))
 - Fixed legacy extension plugin validation failures by re-exporting relocated catalog symbols (such as `calculateCost`, `modelsAreEqual`, and `getBundledProviders`) through the legacy `pi-ai` root shim.
 - Fixed legacy Pi extension imports of `DefaultResourceLoader` by adding a compatibility loader shim that translates `resourceLoader` into native session discovery options.
 - Fixed legacy Pi extension reloads on POSIX to ensure same-process re-imports pick up edits across the entire dependency graph.
diff --git a/packages/coding-agent/src/config/settings.ts b/packages/coding-agent/src/config/settings.ts
index 0bde19651..268b147f7 100644
--- a/packages/coding-agent/src/config/settings.ts
+++ b/packages/coding-agent/src/config/settings.ts
@@ -429,6 +429,9 @@ export class Settings {
 		if (path === "statusLine.sessionAccent") {
 			statusLineSessionAccentSignal.fire();
 		}
+		if (path === "modelRoles") {
+			modelRolesSignal.fire();
+		}
 	}
 
 	/**
@@ -1477,6 +1480,12 @@ const appendOnlyModeSignal = new SettingSignal<[value: string]>("provider.append
  */
 export const onAppendOnlyModeChanged = (cb: (value: string) => void) => appendOnlyModeSignal.on(cb);
 
+/** Fires when any model role changes at runtime. */
+const modelRolesSignal = new SettingSignal("modelRoles");
+
+/** Subscribe to model role changes. Returns an unsubscribe function. */
+export const onModelRolesChanged: (cb: () => void) => () => void = modelRolesSignal.on.bind(modelRolesSignal);
+
 /** Fires when `statusLine.sessionAccent` changes at runtime. */
 const statusLineSessionAccentSignal = new SettingSignal("statusLine.sessionAccent");
 
diff --git a/packages/coding-agent/src/session/agent-session.ts b/packages/coding-agent/src/session/agent-session.ts
index 5fc4697f9..687874031 100644
--- a/packages/coding-agent/src/session/agent-session.ts
+++ b/packages/coding-agent/src/session/agent-session.ts
@@ -181,7 +181,12 @@ import { MODEL_ROLE_IDS, MODEL_ROLES } from "../config/model-roles";
 import { expandPromptTemplate, type PromptTemplate } from "../config/prompt-templates";
 import { buildServiceTierByFamily, serviceTierForAllFamilies, serviceTierSettingToTier } from "../config/service-tier";
 import type { Settings, SkillsSettings } from "../config/settings";
-import { getDefault, onAppendOnlyModeChanged, validateProviderMaxInFlightRequests } from "../config/settings";
+import {
+	getDefault,
+	onAppendOnlyModeChanged,
+	onModelRolesChanged,
+	validateProviderMaxInFlightRequests,
+} from "../config/settings";
 import { RawSseDebugBuffer } from "../debug/raw-sse-buffer";
 import { loadCapability } from "../discovery";
 import { expandApplyPatchToEntries, normalizeDiff, normalizeToLF, ParseError, previewPatch, stripBom } from "../edit";
@@ -1562,6 +1567,7 @@ export class AgentSession {
 	#cancelExitRecorder?: () => void;
 	#exitRecorded = false;
 	#unsubscribeAppendOnly?: () => void;
+	#unsubscribeModelRoles?: () => void;
 	/** Last (enable, providerId) tuple resolved by `#syncAppendOnlyContext` — used to skip no-op invalidations. */
 	#lastAppendOnlyResolution?: { enable: boolean; providerId: string | undefined };
 	#eventListeners: AgentSessionEventListener[] = [];
@@ -2270,6 +2276,11 @@ export class AgentSession {
 		this.#unsubscribeAgent = this.agent.subscribe(this.#handleAgentEvent);
 		// Re-evaluate append-only context mode when the setting changes at runtime.
 		this.#unsubscribeAppendOnly = onAppendOnlyModeChanged(_value => this.#syncAppendOnlyContext(this.model));
+		this.#unsubscribeModelRoles = onModelRolesChanged(() => {
+			if (!this.#advisorEnabled || this.#isDisposed) return;
+			if (this.#advisors.length > 0 && !this.#advisorRuntimeMatchesCurrentConfig()) this.#stopAdvisorRuntime();
+			this.#buildAdvisorRuntime(true);
+		});
 	}
 	// -------------------------------------------------------------------------
 	// Advisor runtime lifecycle
@@ -5781,6 +5792,10 @@ export class AgentSession {
 			this.#unsubscribeAppendOnly();
 			this.#unsubscribeAppendOnly = undefined;
 		}
+		if (this.#unsubscribeModelRoles) {
+			this.#unsubscribeModelRoles();
+			this.#unsubscribeModelRoles = undefined;
+		}
 		this.#eventListeners = [];
 	}
 
diff --git a/packages/coding-agent/test/advisor-toggle.test.ts b/packages/coding-agent/test/advisor-toggle.test.ts
index 0812a895b..0d911aad0 100644
--- a/packages/coding-agent/test/advisor-toggle.test.ts
+++ b/packages/coding-agent/test/advisor-toggle.test.ts
@@ -98,6 +98,18 @@ describe("AgentSession advisor toggle", () => {
 		expect(session.getAdvisorAgent()?.state.model.id).toBe(replacementModel.id);
 	});
 
+	it("refreshes the live advisor when the advisor role setting changes", () => {
+		session.settings.setModelRole("advisor", `${model.provider}/${model.id}`);
+		expect(session.setAdvisorEnabled(true)).toBe(true);
+		expect(session.getAdvisorAgent()?.state.model.provider).toBe(model.provider);
+		expect(session.getAdvisorAgent()?.state.model.id).toBe(model.id);
+
+		session.settings.setModelRole("advisor", `${replacementModel.provider}/${replacementModel.id}`);
+
+		expect(session.getAdvisorAgent()?.state.model.provider).toBe(replacementModel.provider);
+		expect(session.getAdvisorAgent()?.state.model.id).toBe(replacementModel.id);
+	});
+
 	it("keeps explicit enable idempotent when the advisor config is unchanged", () => {
 		session.settings.setModelRole("advisor", `${model.provider}/${model.id}`);
 		expect(session.setAdvisorEnabled(true)).toBe(true);