diff --git a/packages/coding-agent/src/modes/interactive/components/scoped-models-selector.ts b/packages/coding-agent/src/modes/interactive/components/scoped-models-selector.ts
index e7dfc271496..d1a1090d004 100644
--- a/packages/coding-agent/src/modes/interactive/components/scoped-models-selector.ts
+++ b/packages/coding-agent/src/modes/interactive/components/scoped-models-selector.ts
@@ -18,6 +18,30 @@ import { keyText } from "./keybinding-hints.ts";
 // EnabledIds: null = all enabled (no filter), string[] = explicit ordered list
 type EnabledIds = string[] | null;
 
+const MODEL_ID_COLLATOR = new Intl.Collator(undefined, { numeric: true, sensitivity: "base" });
+const CONTEXT_ALIAS_PATTERN = /^(.*)@(\d+(?:\.\d+)?)([km])$/i;
+
+function parseContextAlias(id: string): { base: string; tokens: number } | undefined {
+	const match = id.match(CONTEXT_ALIAS_PATTERN);
+	if (!match) return undefined;
+	const value = Number(match[2]);
+	if (!Number.isFinite(value)) return undefined;
+	return { base: match[1]!, tokens: value * (match[3]!.toLowerCase() === "m" ? 1_000_000 : 1_000) };
+}
+
+function compareModelIds(left: string, right: string): number {
+	const leftAlias = parseContextAlias(left);
+	const rightAlias = parseContextAlias(right);
+	const baseOrder = MODEL_ID_COLLATOR.compare(leftAlias?.base ?? left, rightAlias?.base ?? right);
+	if (baseOrder !== 0) return baseOrder;
+
+	// Keep a canonical model before its context aliases, then order aliases by
+	// their numeric size so @200k appears before @1m.
+	if (!leftAlias) return rightAlias ? -1 : MODEL_ID_COLLATOR.compare(left, right);
+	if (!rightAlias) return 1;
+	return leftAlias.tokens - rightAlias.tokens || MODEL_ID_COLLATOR.compare(left, right);
+}
+
 function isEnabled(enabledIds: EnabledIds, id: string): boolean {
 	return enabledIds === null || enabledIds.includes(id);
 }
@@ -60,9 +84,12 @@ function move(enabledIds: EnabledIds, id: string, delta: number): EnabledIds {
 }
 
 function getSortedIds(enabledIds: EnabledIds, allIds: string[]): string[] {
-	if (enabledIds === null) return allIds;
+	const sortedAllIds = [...allIds].sort(compareModelIds);
+	if (enabledIds === null) return sortedAllIds;
 	const enabledSet = new Set(enabledIds);
-	return [...enabledIds, ...allIds.filter((id) => !enabledSet.has(id))];
+	// Preserve the explicit enabled order because Alt+Up/Alt+Down controls it;
+	// sort the remaining catalog so newly discovered models are predictable.
+	return [...enabledIds, ...sortedAllIds.filter((id) => !enabledSet.has(id))];
 }
 
 interface ModelItem {
diff --git a/packages/coding-agent/test/suite/regressions/3217-scoped-model-order.test.ts b/packages/coding-agent/test/suite/regressions/3217-scoped-model-order.test.ts
index c44e1b36f3e..dc6b3f21c9a 100644
--- a/packages/coding-agent/test/suite/regressions/3217-scoped-model-order.test.ts
+++ b/packages/coding-agent/test/suite/regressions/3217-scoped-model-order.test.ts
@@ -62,6 +62,45 @@ describe("issue #3217 scoped model ordering", () => {
 		expect(changes).toEqual([[orderedIds[1], orderedIds[0], orderedIds[2]]]);
 	});
 
+	it("sorts the unscoped catalog naturally while preserving enabled order", async () => {
+		const harness = await createHarness({
+			models: [
+				{ id: "gpt-5.6-luna@1m", name: "Luna 1M" },
+				{ id: "gpt-5.6-luna@200k", name: "Luna 200K" },
+				{ id: "gpt-5.6-luna", name: "Luna" },
+				{ id: "gpt-5.6-sol@272k", name: "Sol 272K" },
+				{ id: "gpt-5.5", name: "GPT-5.5" },
+			],
+		});
+		harnesses.push(harness);
+
+		const provider = harness.models[0]!.provider;
+		const selector = new ScopedModelsSelectorComponent(
+			{
+				allModels: [...harness.models],
+				enabledModelIds: [`${provider}/gpt-5.6-luna`],
+			},
+			{
+				onChange: () => {},
+				onPersist: () => {},
+				onCancel: () => {},
+			},
+		);
+
+		const renderedIds = stripAnsi(selector.render(120).join("\\n"))
+			.split("\\n")
+			.filter((line) => line.includes(`[${provider}]`))
+			.map((line) => line.trim().replace(/^→\s*/, "").split(" [")[0]);
+
+		expect(renderedIds).toEqual([
+			"gpt-5.6-luna",
+			"gpt-5.5",
+			"gpt-5.6-luna@200k",
+			"gpt-5.6-luna@1m",
+			"gpt-5.6-sol@272k",
+		]);
+	});
+
 	it("preserves scoped model order in the /model scoped tab", async () => {
 		const harness = await createHarness({
 			models: [