diff --git a/packages/types/src/__tests__/vscode-llm.spec.ts b/packages/types/src/__tests__/vscode-llm.spec.ts
index e099c098f4..dd4fee51c9 100644
--- a/packages/types/src/__tests__/vscode-llm.spec.ts
+++ b/packages/types/src/__tests__/vscode-llm.spec.ts
@@ -3,8 +3,7 @@ import { vscodeLlmModels, vscodeLlmDefaultModelId } from "../providers/vscode-ll
 
 describe("vscodeLlmModels", () => {
 	it("exposes the opus-4.8 row with its measured maxInputTokens and contextWindow", () => {
-		// claude-opus-4.8 intentionally diverges: maxInputTokens (197897) is the enforced ceiling the
-		// UI reads, contextWindow (679560) the advertised window. Assert the on-disk literals as a tripwire.
+		// The two values differ for this row, so pin the exact stored values rather than forcing equality.
 		expect(vscodeLlmModels).toHaveProperty("claude-opus-4.8")
 		expect(vscodeLlmModels["claude-opus-4.8"].contextWindow).toBe(679560)
 		expect(vscodeLlmModels["claude-opus-4.8"].maxInputTokens).toBe(197897)
@@ -16,13 +15,16 @@ describe("vscodeLlmModels", () => {
 		expect(vscodeLlmModels["gemini-2.5-pro"].maxInputTokens).toBe(108594)
 	})
 	it.each([
-		["claude-opus-5", "Claude Opus 5", 935793, 197897],
+		["claude-opus-5.5", "Claude Opus 5.5", 871793, 677108],
+		["claude-opus-5", "Claude Opus 5", 935793, 680456],
 		["claude-sonnet-5", "Claude Sonnet 5", 925449, 925449],
 		["gpt-5.6-luna", "GPT-5.6 Luna", 199753, 199753],
 		["gpt-5.6-sol", "GPT-5.6 Sol", 271785, 271785],
 		["gpt-5.6-terra", "GPT-5.6 Terra", 271785, 271785],
-		["gemini-3.6-flash", "Gemini 3.6 Flash", 935793, 197897],
-	] as const)("preserves PR #13 row %s (%s) with PR #14 ceilings", (family, name, contextWindow, maxInputTokens) => {
+		["gemini-3.8-flash", "Gemini 3.8 Flash", 982833, 955113],
+		["gemini-3.7-flash", "Gemini 3.7 Flash", 935793, 935783],
+		["gemini-3.6-flash", "Gemini 3.6 Flash", 935793, 935785],
+	] as const)("preserves measured row %s (%s)", (family, name, contextWindow, maxInputTokens) => {
 		expect(vscodeLlmModels[family]).toEqual({
 			contextWindow,
 			supportsImages: true,
@@ -38,7 +40,85 @@ describe("vscodeLlmModels", () => {
 	})
 
 	it.each([
-		["claude-opus-5", "claude-opus-4.8"],
+		["grok-4.5", "Grok 4.5", 199783],
+		["grok-4.6", "Grok 4.6", 199784],
+	] as const)("keeps %s image input disabled pending evidence", (family, name, maxInputTokens) => {
+		expect(vscodeLlmModels[family]).toEqual({
+			contextWindow: 424794,
+			supportsImages: false,
+			supportsPromptCache: false,
+			inputPrice: 0,
+			outputPrice: 0,
+			family,
+			version: family,
+			name,
+			supportsToolCalling: true,
+			maxInputTokens,
+		})
+	})
+
+	it("records Astra's measured budget minus a 5K safety margin without unmeasured prices", () => {
+		expect(vscodeLlmModels["gpt-6-astra"]).toEqual({
+			contextWindow: 921793,
+			supportsImages: true,
+			supportsPromptCache: false,
+			family: "gpt-6-astra",
+			version: "gpt-6-astra",
+			name: "GPT-6 Astra",
+			supportsToolCalling: true,
+			maxInputTokens: 266789,
+		})
+		expect(vscodeLlmModels["gpt-6-astra"]).not.toHaveProperty("inputPrice")
+		expect(vscodeLlmModels["gpt-6-astra"]).not.toHaveProperty("outputPrice")
+	})
+
+	it.each([
+		["claude-sonnet-5.5", "Claude Sonnet 5.5", 871793, 680552, true],
+		["claude-haiku-5.5", "Claude Haiku 5.5", 871793, 99784, true],
+		["grok-4.7", "Grok 4.7", 424794, 199751, false],
+		["gemini-4-argon", "Gemini 4 Argon", 982833, 953064, true],
+		["vscModelF", "MAI-Code-2-Flash (Preview)", 921790, 921736, true],
+		["oswe-vscode-modelD", "MAI-Code-1.1-Flash", 127790, 127783, true],
+		["gpt-6.1-sol", "GPT-6.1 Sol", 921793, 269903, true],
+		["gpt-5.6-sol-fast", "GPT-5.6 Sol Fast (Internal only)", 921793, 269903, true],
+		["gpt-6.1-terra", "GPT-6.1 Terra", 871793, 269123, true],
+		["gpt-6-luna", "GPT-6 Luna", 871793, 269122, true],
+		["gpt-6-sol", "GPT-6 Sol", 871793, 269122, true],
+		["claude-fable-5.1", "Claude Fable 5.1", 935793, 660686, true],
+		["claude-fable-5", "Claude Fable 5", 935793, 658785, true],
+	] as const)(
+		"records the October capture for %s without unmeasured prices",
+		(family, name, contextWindow, maxInputTokens, supportsImages) => {
+			expect(vscodeLlmModels[family]).toEqual({
+				contextWindow,
+				maxInputTokens,
+				supportsImages,
+				supportsPromptCache: false,
+				family,
+				version: family,
+				name,
+				supportsToolCalling: true,
+			})
+			expect(vscodeLlmModels[family]).not.toHaveProperty("inputPrice")
+			expect(vscodeLlmModels[family]).not.toHaveProperty("outputPrice")
+		},
+	)
+
+	it("assigns Fable 5.5 the requested Fable 5.1 values rather than claiming a measurement", () => {
+		expect(vscodeLlmModels["claude-fable-5.5"]).toEqual({
+			...vscodeLlmModels["claude-fable-5.1"],
+			family: "claude-fable-5.5",
+			version: "claude-fable-5.5",
+			name: "Claude Fable 5.5",
+		})
+		expect(vscodeLlmModels["claude-fable-5.5"].contextWindow).toBe(935793)
+		expect(vscodeLlmModels["claude-fable-5.5"].maxInputTokens).toBe(660686)
+	})
+
+	it.each([
+		["claude-opus-5.5", "claude-opus-5", "claude-opus-4.8"],
+		["gpt-6-astra", "gpt-5.6-luna"],
+		["grok-4.6", "grok-4.5", "gemini-3.8-flash", "gemini-3.7-flash", "gemini-3.6-flash"],
 		["claude-sonnet-5", "claude-sonnet-4.6"],
 		["gpt-5.6-luna", "gpt-5.6-sol", "gpt-5.6-terra", "gpt-5.5"],
 		["gemini-3.6-flash", "gemini-3.1-pro-preview"],
diff --git a/packages/types/src/providers/vscode-llm.ts b/packages/types/src/providers/vscode-llm.ts
index b6ba122d53..fdc199b2b2 100644
--- a/packages/types/src/providers/vscode-llm.ts
+++ b/packages/types/src/providers/vscode-llm.ts
@@ -49,12 +49,24 @@ export type VscodeLlmModelId = keyof typeof vscodeLlmModels
 
 export const vscodeLlmDefaultModelId: VscodeLlmModelId = "claude-sonnet-4.5"
 
-// The UI and condense gate use maxInputTokens; contextWindow preserves the advertised window.
-// https://github.com/simurg79/Roo-Code/pull/13: sonnet-5 and gpt-5.6 were binary-searched.
-// https://github.com/simurg79/Roo-Code/pull/14: opus-5 and gemini-3.6-flash retain advertised
-// 935793 windows but conservatively reuse the 197897 ceiling measured on other models to avoid
-// request overflow; neither model's actual input ceiling has been measured.
+// The UI and condense gate use assigned maxInputTokens budgets; contextWindow keeps advertised windows.
+// Use measured acceptances, optionally lowered by documented safety margins; Fable 5.5 alone borrows 5.1's values.
+// Measurement details: https://github.com/simurg79/Roo-Code/pull/26.
 export const vscodeLlmModels = {
+	// Refusals left the 2026-09-23 bracket open (677108 accepted, 695778 rejected); use the lower bound.
+	// Image/tool inputs succeeded; caching false and zero prices remain unverified defaults.
+	"claude-opus-5.5": {
+		contextWindow: 871793,
+		supportsImages: true,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+		family: "claude-opus-5.5",
+		version: "claude-opus-5.5",
+		name: "Claude Opus 5.5",
+		supportsToolCalling: true,
+		maxInputTokens: 677108,
+	},
 	"claude-opus-5": {
 		contextWindow: 935793,
 		supportsImages: true,
@@ -65,7 +77,7 @@ export const vscodeLlmModels = {
 		version: "claude-opus-5",
 		name: "Claude Opus 5",
 		supportsToolCalling: true,
-		maxInputTokens: 197897,
+		maxInputTokens: 680456,
 	},
 	"claude-opus-4.8": {
 		contextWindow: 679560,
@@ -115,6 +127,156 @@ export const vscodeLlmModels = {
 		supportsToolCalling: true,
 		maxInputTokens: 167790,
 	},
+	// Rows below through oswe-vscode-modelD: measured 2026-10-28, VS Code 1.142.0/copilot; maxInputTokens is
+	// an explicitly accepted size (the smaller when repeated). Prices and caching are unmeasured.
+	"claude-sonnet-5.5": {
+		contextWindow: 871793,
+		supportsImages: true,
+		supportsPromptCache: false,
+		family: "claude-sonnet-5.5",
+		version: "claude-sonnet-5.5",
+		name: "Claude Sonnet 5.5",
+		supportsToolCalling: true,
+		maxInputTokens: 680552,
+	},
+	"claude-haiku-5.5": {
+		contextWindow: 871793,
+		supportsImages: true,
+		supportsPromptCache: false,
+		family: "claude-haiku-5.5",
+		version: "claude-haiku-5.5",
+		name: "Claude Haiku 5.5",
+		supportsToolCalling: true,
+		maxInputTokens: 99784,
+	},
+	"grok-4.7": {
+		contextWindow: 424794,
+		// Image request failed with a nondiagnostic HTTP 400: disabled pending evidence.
+		supportsImages: false,
+		supportsPromptCache: false,
+		family: "grok-4.7",
+		version: "grok-4.7",
+		name: "Grok 4.7",
+		supportsToolCalling: true,
+		maxInputTokens: 199751,
+	},
+	"gemini-4-argon": {
+		contextWindow: 982833,
+		supportsImages: true,
+		supportsPromptCache: false,
+		family: "gemini-4-argon",
+		version: "gemini-4-argon",
+		name: "Gemini 4 Argon",
+		supportsToolCalling: true,
+		// Accepted at the advertised target; no observed rejection, so only a lower bound.
+		maxInputTokens: 953064,
+	},
+	// Provider lookups need the live family key, not the user-facing id mai-code-2-flash.
+	vscModelF: {
+		contextWindow: 921790,
+		supportsImages: true,
+		supportsPromptCache: false,
+		family: "vscModelF",
+		version: "vscModelF",
+		name: "MAI-Code-2-Flash (Preview)",
+		supportsToolCalling: true,
+		maxInputTokens: 921736,
+	},
+	// Live family string; the user-facing id is mai-code-1.1-flash.
+	"oswe-vscode-modelD": {
+		contextWindow: 127790,
+		supportsImages: true,
+		supportsPromptCache: false,
+		family: "oswe-vscode-modelD",
+		version: "oswe-vscode-modelD",
+		name: "MAI-Code-1.1-Flash",
+		supportsToolCalling: true,
+		maxInputTokens: 127783,
+	},
+	// Captured 2026-10-28 UTC (Fable 5: 2026-10-29 UTC), VS Code 1.142.0/copilot.
+	// Image/tool requests were accepted, not verified for understanding or invocation.
+	// Prices and caching are unmeasured; caching false is a schema default.
+	"gpt-6.1-sol": {
+		contextWindow: 921793,
+		supportsImages: true,
+		supportsPromptCache: false,
+		family: "gpt-6.1-sol",
+		version: "gpt-6.1-sol",
+		name: "GPT-6.1 Sol",
+		supportsToolCalling: true,
+		maxInputTokens: 269903,
+	},
+	"gpt-5.6-sol-fast": {
+		contextWindow: 921793,
+		supportsImages: true,
+		supportsPromptCache: false,
+		family: "gpt-5.6-sol-fast",
+		version: "gpt-5.6-sol-fast",
+		name: "GPT-5.6 Sol Fast (Internal only)",
+		supportsToolCalling: true,
+		maxInputTokens: 269903,
+	},
+	"gpt-6.1-terra": {
+		contextWindow: 871793,
+		supportsImages: true,
+		supportsPromptCache: false,
+		family: "gpt-6.1-terra",
+		version: "gpt-6.1-terra",
+		name: "GPT-6.1 Terra",
+		supportsToolCalling: true,
+		maxInputTokens: 269123,
+	},
+	"gpt-6-luna": {
+		contextWindow: 871793,
+		supportsImages: true,
+		supportsPromptCache: false,
+		family: "gpt-6-luna",
+		version: "gpt-6-luna",
+		name: "GPT-6 Luna",
+		supportsToolCalling: true,
+		maxInputTokens: 269122,
+	},
+	"gpt-6-sol": {
+		contextWindow: 871793,
+		supportsImages: true,
+		supportsPromptCache: false,
+		family: "gpt-6-sol",
+		version: "gpt-6-sol",
+		name: "GPT-6 Sol",
+		supportsToolCalling: true,
+		maxInputTokens: 269122,
+	},
+	"claude-fable-5.1": {
+		contextWindow: 935793,
+		supportsImages: true,
+		supportsPromptCache: false,
+		family: "claude-fable-5.1",
+		version: "claude-fable-5.1",
+		name: "Claude Fable 5.1",
+		supportsToolCalling: true,
+		maxInputTokens: 660686,
+	},
+	"claude-fable-5": {
+		contextWindow: 935793,
+		supportsImages: true,
+		supportsPromptCache: false,
+		family: "claude-fable-5",
+		version: "claude-fable-5",
+		name: "Claude Fable 5",
+		supportsToolCalling: true,
+		maxInputTokens: 658785,
+	},
+	// Values copied from claude-fable-5.1 at the user's request; not measured for claude-fable-5.5.
+	"claude-fable-5.5": {
+		contextWindow: 935793,
+		supportsImages: true,
+		supportsPromptCache: false,
+		family: "claude-fable-5.5",
+		version: "claude-fable-5.5",
+		name: "Claude Fable 5.5",
+		supportsToolCalling: true,
+		maxInputTokens: 660686,
+	},
 	"claude-sonnet-5": {
 		contextWindow: 925449,
 		supportsImages: true,
@@ -163,6 +325,18 @@ export const vscodeLlmModels = {
 		supportsToolCalling: true,
 		maxInputTokens: 135790,
 	},
+	// The 2026-09-23 trials accepted 271789 and rejected 271790; subtract a 5K safety margin.
+	// Image/tool inputs succeeded; caching false is unverified, and optional prices are unmeasured.
+	"gpt-6-astra": {
+		contextWindow: 921793,
+		supportsImages: true,
+		supportsPromptCache: false,
+		family: "gpt-6-astra",
+		version: "gpt-6-astra",
+		name: "GPT-6 Astra",
+		supportsToolCalling: true,
+		maxInputTokens: 266789,
+	},
 	"gpt-5.6-luna": {
 		contextWindow: 199753,
 		supportsImages: true,
@@ -271,6 +445,57 @@ export const vscodeLlmModels = {
 		supportsToolCalling: true,
 		maxInputTokens: 12078,
 	},
+	"grok-4.6": {
+		contextWindow: 424794,
+		// Image trials failed with nondiagnostic HTTP 400s; disable pending evidence.
+		supportsImages: false,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+		family: "grok-4.6",
+		version: "grok-4.6",
+		name: "Grok 4.6",
+		supportsToolCalling: true,
+		maxInputTokens: 199784,
+	},
+	"grok-4.5": {
+		contextWindow: 424794,
+		// As with Grok 4.6, image capability remains unverified.
+		supportsImages: false,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+		family: "grok-4.5",
+		version: "grok-4.5",
+		name: "Grok 4.5",
+		supportsToolCalling: true,
+		maxInputTokens: 199783,
+	},
+	"gemini-3.8-flash": {
+		contextWindow: 982833,
+		supportsImages: true,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+		family: "gemini-3.8-flash",
+		version: "gemini-3.8-flash",
+		name: "Gemini 3.8 Flash",
+		supportsToolCalling: true,
+		// No rejection was observed; this is an accepted lower bound, not an exact ceiling.
+		maxInputTokens: 955113,
+	},
+	"gemini-3.7-flash": {
+		contextWindow: 935793,
+		supportsImages: true,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+		family: "gemini-3.7-flash",
+		version: "gemini-3.7-flash",
+		name: "Gemini 3.7 Flash",
+		supportsToolCalling: true,
+		maxInputTokens: 935783,
+	},
 	"gemini-3.6-flash": {
 		contextWindow: 935793,
 		supportsImages: true,
@@ -281,7 +506,7 @@ export const vscodeLlmModels = {
 		version: "gemini-3.6-flash",
 		name: "Gemini 3.6 Flash",
 		supportsToolCalling: true,
-		maxInputTokens: 197897,
+		maxInputTokens: 935785,
 	},
 	"gemini-3.1-pro-preview": {
 		contextWindow: 197897,
diff --git a/src/api/providers/__tests__/vscode-lm.spec.ts b/src/api/providers/__tests__/vscode-lm.spec.ts
index 48d1016fde..309155c5f1 100644
--- a/src/api/providers/__tests__/vscode-lm.spec.ts
+++ b/src/api/providers/__tests__/vscode-lm.spec.ts
@@ -208,6 +208,24 @@ describe("VsCodeLmHandler", () => {
 			},
 		)
 
+		it.each(
+			["grok-4.7", "gpt-6.1-sol", "claude-fable-5"].flatMap((family) =>
+				[true, false, undefined].map((supportsImages) => ({ family, supportsImages })),
+			),
+		)("uses the host's image capability $supportsImages for $family", async ({ family, supportsImages }) => {
+			await handler.initializeClient()
+			const client = {
+				...mockLanguageModelChat,
+				family,
+				capabilities: { supportsImageToText: supportsImages },
+			}
+			handler["client"] = client
+			vi.mocked(vscode.lm.selectChatModels).mockResolvedValue([client])
+
+			expect(handler.getModel().info.supportsImages).toBe(supportsImages)
+			expect((await getVsCodeLmModels())[0].modelInfo.supportsImages).toBe(supportsImages)
+		})
+
 		it.each(
 			(["message", "tool_result"] as const).flatMap((path) =>
 				[true, false, undefined].map((supportsImages) => ({ path, supportsImages })),
@@ -4056,6 +4074,53 @@ describe("VsCodeLmHandler", () => {
 	})
 
 	describe("getCondenseContextWindow", () => {
+		it.each([
+			["claude-opus-5.5", 677108],
+			["gpt-6-astra", 266789],
+			["claude-sonnet-5.5", 680552],
+			["claude-haiku-5.5", 99784],
+			["grok-4.7", 199751],
+			["gemini-4-argon", 953064],
+			["vscModelF", 921736],
+			["oswe-vscode-modelD", 127783],
+			["gpt-6.1-sol", 269903],
+			["gpt-5.6-sol-fast", 269903],
+			["gpt-6.1-terra", 269123],
+			["gpt-6-luna", 269122],
+			["gpt-6-sol", 269122],
+			["claude-fable-5.1", 660686],
+			["claude-fable-5", 658785],
+			["claude-fable-5.5", 660686],
+			["grok-4.5", 199783],
+			["grok-4.6", 199784],
+			["gemini-3.7-flash", 935783],
+			["gemini-3.8-flash", 955113],
+			["claude-opus-5", 680456],
+			["gemini-3.6-flash", 935785],
+		] as const)("uses %s's assigned budget rather than its advertised window", async (family, expected) => {
+			await handler.initializeClient()
+			handler["client"] = { ...mockLanguageModelChat, family, maxInputTokens: 2_000_000 }
+
+			expect(handler.getCondenseContextWindow()).toBe(expected)
+			expect(handler.getModel().info.contextWindow).toBe(2_000_000)
+			expect(handler.getModel().info.supportsImages).toBeUndefined()
+
+			handler["client"] = { ...mockLanguageModelChat, family, maxInputTokens: 123456 }
+			expect(handler.getModel().info.contextWindow).toBe(123456)
+			expect(handler.getCondenseContextWindow()).toBe(expected)
+		})
+
+		it.each(["copilot", "some-other-vendor"])("resolves Astra's selector budget for vendor %s", (vendor) => {
+			const selectedHandler = new VsCodeLmHandler({
+				vsCodeLmModelSelector: { vendor, family: "gpt-6-astra" },
+			})
+			try {
+				expect(selectedHandler.getCondenseContextWindow()).toBe(266789)
+			} finally {
+				selectedHandler.dispose()
+			}
+		})
+
 		it("uses the static-table maxInputTokens for a known VS Code LM family", () => {
 			const opusHandler = new VsCodeLmHandler({
 				vsCodeLmModelSelector: { vendor: "copilot", family: "claude-opus-4.8" },
diff --git a/webview-ui/src/components/ui/hooks/__tests__/useSelectedModel.spec.ts b/webview-ui/src/components/ui/hooks/__tests__/useSelectedModel.spec.ts
index 8a7304f3ac..62af5fb6fa 100644
--- a/webview-ui/src/components/ui/hooks/__tests__/useSelectedModel.spec.ts
+++ b/webview-ui/src/components/ui/hooks/__tests__/useSelectedModel.spec.ts
@@ -1787,25 +1787,59 @@ describe("useSelectedModel", () => {
 			expect(result.current.info?.supportsImages).toBeUndefined()
 		})
 
-		it.each(["claude-opus-4.8", "claude-opus-5", "gemini-3.6-flash"] as const)(
-			"pins %s to the 197897 input ceiling, not its advertised window",
-			(family) => {
-				const apiConfiguration: ProviderSettings = {
-					apiProvider: providerIdentifiers.vscodeLm,
-					vsCodeLmModelSelector: { vendor: "copilot", family },
-				}
+		it.each([
+			["claude-opus-4.8", 197897],
+			["claude-opus-5.5", 677108],
+			["claude-opus-5", 680456],
+			["gpt-6-astra", 266789],
+			["claude-sonnet-5.5", 680552],
+			["claude-haiku-5.5", 99784],
+			["grok-4.7", 199751],
+			["gemini-4-argon", 953064],
+			["vscModelF", 921736],
+			["oswe-vscode-modelD", 127783],
+			["gpt-6.1-sol", 269903],
+			["gpt-5.6-sol-fast", 269903],
+			["gpt-6.1-terra", 269123],
+			["gpt-6-luna", 269122],
+			["gpt-6-sol", 269122],
+			["claude-fable-5.1", 660686],
+			["claude-fable-5", 658785],
+			["claude-fable-5.5", 660686],
+			["grok-4.5", 199783],
+			["grok-4.6", 199784],
+			["gemini-3.7-flash", 935783],
+			["gemini-3.8-flash", 955113],
+			["gemini-3.6-flash", 935785],
+		] as const)("pins %s to the %s assigned input budget, not its advertised window", (family, expected) => {
+			const apiConfiguration: ProviderSettings = {
+				apiProvider: providerIdentifiers.vscodeLm,
+				vsCodeLmModelSelector: { vendor: "copilot", family },
+			}
 
-				const wrapper = createWrapper()
-				const { result } = renderHook(() => useSelectedModel(apiConfiguration), { wrapper })
+			const wrapper = createWrapper()
+			const { result } = renderHook(() => useSelectedModel(apiConfiguration), { wrapper })
 
-				expect(result.current.provider).toBe(providerIdentifiers.vscodeLm)
-				expect(result.current.id).toBe(`copilot/${family}`)
-				expect(result.current.info?.contextWindow).toBe(197897)
-				expect(result.current.info?.contextWindow).toBe(vscodeLlmModels[family].maxInputTokens)
-				expect(result.current.info?.contextWindow).not.toBe(vscodeLlmModels[family].contextWindow)
-				expect(result.current.info?.supportsImages).toBeUndefined()
-			},
-		)
+			expect(result.current.provider).toBe(providerIdentifiers.vscodeLm)
+			expect(result.current.id).toBe(`copilot/${family}`)
+			expect(result.current.info?.contextWindow).toBe(expected)
+			expect(result.current.info?.contextWindow).toBe(vscodeLlmModels[family].maxInputTokens)
+			expect(result.current.info?.contextWindow).not.toBe(vscodeLlmModels[family].contextWindow)
+			expect(result.current.info?.supportsImages).toBeUndefined()
+		})
+
+		it.each(["copilot", "some-other-vendor"])("uses the same measured budget for vendor %s", (vendor) => {
+			const { result } = renderHook(
+				() =>
+					useSelectedModel({
+						apiProvider: providerIdentifiers.vscodeLm,
+						vsCodeLmModelSelector: { vendor, family: "gpt-6-astra" },
+					}),
+				{ wrapper: createWrapper() },
+			)
+			expect(result.current.info?.contextWindow).toBe(266789)
+			expect(result.current.id).toBe(`${vendor}/gpt-6-astra`)
+		})
 
 		it("falls back to the default model's window for an unlisted family (NOT 128000)", () => {
 			const apiConfiguration: ProviderSettings = {