diff --git a/packages/types/src/providers/anthropic.ts b/packages/types/src/providers/anthropic.ts
index 1c0977bd06..759ebdea55 100644
--- a/packages/types/src/providers/anthropic.ts
+++ b/packages/types/src/providers/anthropic.ts
@@ -6,7 +6,7 @@ export type AnthropicModelId = keyof typeof anthropicModels
 export const anthropicDefaultModelId: AnthropicModelId = "claude-sonnet-4-20250514"
 
 export const anthropicModels = {
-	"claude-4.5-sonnet": {
+	"claude-sonnet-4-5": {
 		maxTokens: 64_000, // Overridden to 8k if `enableReasoningEffort` is false.
 		contextWindow: 200_000, // Default 200K, extendable to 1M with beta flag 'context-1m-2025-08-07'
 		supportsImages: true,
diff --git a/packages/types/src/providers/bedrock.ts b/packages/types/src/providers/bedrock.ts
index dce4e024a0..87e62e1045 100644
--- a/packages/types/src/providers/bedrock.ts
+++ b/packages/types/src/providers/bedrock.ts
@@ -457,4 +457,7 @@ export const BEDROCK_REGIONS = [
 	{ value: "us-gov-west-1", label: "us-gov-west-1" },
 ].sort((a, b) => a.value.localeCompare(b.value))
 
-export const BEDROCK_CLAUDE_SONNET_4_MODEL_ID = "anthropic.claude-sonnet-4-20250514-v1:0"
+export const BEDROCK_1M_CONTEXT_MODEL_IDS = [
+	"anthropic.claude-sonnet-4-20250514-v1:0",
+	"anthropic.claude-sonnet-4-5-20250929-v1:0",
+] as const
diff --git a/packages/types/src/providers/claude-code.ts b/packages/types/src/providers/claude-code.ts
index fb44b57658..a00066d87f 100644
--- a/packages/types/src/providers/claude-code.ts
+++ b/packages/types/src/providers/claude-code.ts
@@ -40,8 +40,8 @@ export function getClaudeCodeModelId(baseModelId: ClaudeCodeModelId, useVertex =
 }
 
 export const claudeCodeModels = {
-	"claude-4.5-sonnet": {
-		...anthropicModels["claude-4.5-sonnet"],
+	"claude-sonnet-4-5": {
+		...anthropicModels["claude-sonnet-4-5"],
 		supportsImages: false,
 		supportsPromptCache: true, // Claude Code does report cache tokens
 		supportsReasoningEffort: false,
diff --git a/src/api/providers/__tests__/anthropic.spec.ts b/src/api/providers/__tests__/anthropic.spec.ts
index 7b74c87dfc..b05e50125b 100644
--- a/src/api/providers/__tests__/anthropic.spec.ts
+++ b/src/api/providers/__tests__/anthropic.spec.ts
@@ -268,10 +268,10 @@ describe("AnthropicHandler", () => {
 		it("should handle Claude 4.5 Sonnet model correctly", () => {
 			const handler = new AnthropicHandler({
 				apiKey: "test-api-key",
-				apiModelId: "claude-4.5-sonnet",
+				apiModelId: "claude-sonnet-4-5",
 			})
 			const model = handler.getModel()
-			expect(model.id).toBe("claude-4.5-sonnet")
+			expect(model.id).toBe("claude-sonnet-4-5")
 			expect(model.info.maxTokens).toBe(64000)
 			expect(model.info.contextWindow).toBe(200000)
 			expect(model.info.supportsReasoningBudget).toBe(true)
@@ -280,7 +280,7 @@ describe("AnthropicHandler", () => {
 		it("should enable 1M context for Claude 4.5 Sonnet when beta flag is set", () => {
 			const handler = new AnthropicHandler({
 				apiKey: "test-api-key",
-				apiModelId: "claude-4.5-sonnet",
+				apiModelId: "claude-sonnet-4-5",
 				anthropicBeta1MContext: true,
 			})
 			const model = handler.getModel()
diff --git a/src/api/providers/__tests__/bedrock.spec.ts b/src/api/providers/__tests__/bedrock.spec.ts
index 8df495ca9f..47ba5bd1a6 100644
--- a/src/api/providers/__tests__/bedrock.spec.ts
+++ b/src/api/providers/__tests__/bedrock.spec.ts
@@ -25,7 +25,9 @@ vi.mock("@aws-sdk/client-bedrock-runtime", () => {
 
 import { AwsBedrockHandler } from "../bedrock"
 import { ConverseStreamCommand, BedrockRuntimeClient } from "@aws-sdk/client-bedrock-runtime"
-import { BEDROCK_CLAUDE_SONNET_4_MODEL_ID } from "@roo-code/types"
+import { BEDROCK_1M_CONTEXT_MODEL_IDS } from "@roo-code/types"
+
+const BEDROCK_CLAUDE_SONNET_4_MODEL_ID = BEDROCK_1M_CONTEXT_MODEL_IDS[0]
 
 import type { Anthropic } from "@anthropic-ai/sdk"
 
diff --git a/src/api/providers/anthropic.ts b/src/api/providers/anthropic.ts
index 80ef572b5b..3fb60c0e4f 100644
--- a/src/api/providers/anthropic.ts
+++ b/src/api/providers/anthropic.ts
@@ -47,14 +47,14 @@ export class AnthropicHandler extends BaseProvider implements SingleCompletionHa
 
 		// Add 1M context beta flag if enabled for Claude Sonnet 4 and 4.5
 		if (
-			(modelId === "claude-sonnet-4-20250514" || modelId === "claude-4.5-sonnet") &&
+			(modelId === "claude-sonnet-4-20250514" || modelId === "claude-sonnet-4-5") &&
 			this.options.anthropicBeta1MContext
 		) {
 			betas.push("context-1m-2025-08-07")
 		}
 
 		switch (modelId) {
-			case "claude-4.5-sonnet":
+			case "claude-sonnet-4-5":
 			case "claude-sonnet-4-20250514":
 			case "claude-opus-4-1-20250805":
 			case "claude-opus-4-20250514":
@@ -114,7 +114,7 @@ export class AnthropicHandler extends BaseProvider implements SingleCompletionHa
 
 						// Then check for models that support prompt caching
 						switch (modelId) {
-							case "claude-4.5-sonnet":
+							case "claude-sonnet-4-5":
 							case "claude-sonnet-4-20250514":
 							case "claude-opus-4-1-20250805":
 							case "claude-opus-4-20250514":
@@ -249,7 +249,7 @@ export class AnthropicHandler extends BaseProvider implements SingleCompletionHa
 		let info: ModelInfo = anthropicModels[id]
 
 		// If 1M context beta is enabled for Claude Sonnet 4 or 4.5, update the model info
-		if ((id === "claude-sonnet-4-20250514" || id === "claude-4.5-sonnet") && this.options.anthropicBeta1MContext) {
+		if ((id === "claude-sonnet-4-20250514" || id === "claude-sonnet-4-5") && this.options.anthropicBeta1MContext) {
 			// Use the tier pricing for 1M context
 			const tier = info.tiers?.[0]
 			if (tier) {
diff --git a/src/api/providers/bedrock.ts b/src/api/providers/bedrock.ts
index c6a0b35df4..e0c63683cb 100644
--- a/src/api/providers/bedrock.ts
+++ b/src/api/providers/bedrock.ts
@@ -21,7 +21,7 @@ import {
 	BEDROCK_MAX_TOKENS,
 	BEDROCK_DEFAULT_CONTEXT,
 	AWS_INFERENCE_PROFILE_MAPPING,
-	BEDROCK_CLAUDE_SONNET_4_MODEL_ID,
+	BEDROCK_1M_CONTEXT_MODEL_IDS,
 } from "@roo-code/types"
 
 import { ApiStream } from "../transform/stream"
@@ -378,10 +378,11 @@ export class AwsBedrockHandler extends BaseProvider implements SingleCompletionH
 			inferenceConfig.topP = 0.1
 		}
 
-		// Check if 1M context is enabled for Claude Sonnet 4
+		// Check if 1M context is enabled for Claude Sonnet 4 / 4.5
 		// Use parseBaseModelId to handle cross-region inference prefixes
 		const baseModelId = this.parseBaseModelId(modelConfig.id)
-		const is1MContextEnabled = baseModelId === BEDROCK_CLAUDE_SONNET_4_MODEL_ID && this.options.awsBedrock1MContext
+		const is1MContextEnabled =
+			BEDROCK_1M_CONTEXT_MODEL_IDS.includes(baseModelId as any) && this.options.awsBedrock1MContext
 
 		// Add anthropic_beta for 1M context to additionalModelRequestFields
 		if (is1MContextEnabled) {
@@ -976,10 +977,10 @@ export class AwsBedrockHandler extends BaseProvider implements SingleCompletionH
 			}
 		}
 
-		// Check if 1M context is enabled for Claude Sonnet 4
+		// Check if 1M context is enabled for Claude Sonnet 4 / 4.5
 		// Use parseBaseModelId to handle cross-region inference prefixes
 		const baseModelId = this.parseBaseModelId(modelConfig.id)
-		if (baseModelId === BEDROCK_CLAUDE_SONNET_4_MODEL_ID && this.options.awsBedrock1MContext) {
+		if (BEDROCK_1M_CONTEXT_MODEL_IDS.includes(baseModelId as any) && this.options.awsBedrock1MContext) {
 			// Update context window to 1M tokens when 1M context beta is enabled
 			modelConfig.info = {
 				...modelConfig.info,
diff --git a/webview-ui/src/components/settings/providers/Anthropic.tsx b/webview-ui/src/components/settings/providers/Anthropic.tsx
index 224d1965b6..feef788d49 100644
--- a/webview-ui/src/components/settings/providers/Anthropic.tsx
+++ b/webview-ui/src/components/settings/providers/Anthropic.tsx
@@ -23,7 +23,7 @@ export const Anthropic = ({ apiConfiguration, setApiConfigurationField }: Anthro
 
 	// Check if the current model supports 1M context beta
 	const supports1MContextBeta =
-		selectedModel?.id === "claude-sonnet-4-20250514" || selectedModel?.id === "claude-4.5-sonnet"
+		selectedModel?.id === "claude-sonnet-4-20250514" || selectedModel?.id === "claude-sonnet-4-5"
 
 	const handleInputChange = useCallback(
 		<K extends keyof ProviderSettings, E>(
diff --git a/webview-ui/src/components/settings/providers/Bedrock.tsx b/webview-ui/src/components/settings/providers/Bedrock.tsx
index 6c871e570a..1b3143fa08 100644
--- a/webview-ui/src/components/settings/providers/Bedrock.tsx
+++ b/webview-ui/src/components/settings/providers/Bedrock.tsx
@@ -2,12 +2,7 @@ import { useCallback, useState, useEffect } from "react"
 import { Checkbox } from "vscrui"
 import { VSCodeTextField } from "@vscode/webview-ui-toolkit/react"
 
-import {
-	type ProviderSettings,
-	type ModelInfo,
-	BEDROCK_REGIONS,
-	BEDROCK_CLAUDE_SONNET_4_MODEL_ID,
-} from "@roo-code/types"
+import { type ProviderSettings, type ModelInfo, BEDROCK_REGIONS, BEDROCK_1M_CONTEXT_MODEL_IDS } from "@roo-code/types"
 
 import { useAppTranslation } from "@src/i18n/TranslationContext"
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue, StandardTooltip } from "@src/components/ui"
@@ -24,8 +19,9 @@ export const Bedrock = ({ apiConfiguration, setApiConfigurationField, selectedMo
 	const { t } = useAppTranslation()
 	const [awsEndpointSelected, setAwsEndpointSelected] = useState(!!apiConfiguration?.awsBedrockEndpointEnabled)
 
-	// Check if the selected model supports 1M context (Claude Sonnet 4)
-	const supports1MContextBeta = apiConfiguration?.apiModelId === BEDROCK_CLAUDE_SONNET_4_MODEL_ID
+	// Check if the selected model supports 1M context (Claude Sonnet 4 / 4.5)
+	const supports1MContextBeta =
+		!!apiConfiguration?.apiModelId && BEDROCK_1M_CONTEXT_MODEL_IDS.includes(apiConfiguration.apiModelId as any)
 
 	// Update the endpoint enabled state when the configuration changes
 	useEffect(() => {
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 9d8c627b7f..91f6183679 100644
--- a/webview-ui/src/components/ui/hooks/__tests__/useSelectedModel.spec.ts
+++ b/webview-ui/src/components/ui/hooks/__tests__/useSelectedModel.spec.ts
@@ -5,7 +5,9 @@ import { QueryClient, QueryClientProvider } from "@tanstack/react-query"
 import { renderHook } from "@testing-library/react"
 import type { Mock } from "vitest"
 
-import { ProviderSettings, ModelInfo, BEDROCK_CLAUDE_SONNET_4_MODEL_ID } from "@roo-code/types"
+import { ProviderSettings, ModelInfo, BEDROCK_1M_CONTEXT_MODEL_IDS } from "@roo-code/types"
+
+const BEDROCK_CLAUDE_SONNET_4_MODEL_ID = BEDROCK_1M_CONTEXT_MODEL_IDS[0]
 
 import { useSelectedModel } from "../useSelectedModel"
 import { useRouterModels } from "../useRouterModels"
diff --git a/webview-ui/src/components/ui/hooks/useSelectedModel.ts b/webview-ui/src/components/ui/hooks/useSelectedModel.ts
index 3a24df2f85..b68e4809f2 100644
--- a/webview-ui/src/components/ui/hooks/useSelectedModel.ts
+++ b/webview-ui/src/components/ui/hooks/useSelectedModel.ts
@@ -55,7 +55,7 @@ import {
 	qwenCodeDefaultModelId,
 	qwenCodeModels,
 	vercelAiGatewayDefaultModelId,
-	BEDROCK_CLAUDE_SONNET_4_MODEL_ID,
+	BEDROCK_1M_CONTEXT_MODEL_IDS,
 	deepInfraDefaultModelId,
 } from "@roo-code/types"
 
@@ -200,8 +200,8 @@ function getSelectedModel({
 				}
 			}
 
-			// Apply 1M context for Claude Sonnet 4 when enabled
-			if (id === BEDROCK_CLAUDE_SONNET_4_MODEL_ID && apiConfiguration.awsBedrock1MContext && baseInfo) {
+			// Apply 1M context for Claude Sonnet 4 / 4.5 when enabled
+			if (BEDROCK_1M_CONTEXT_MODEL_IDS.includes(id as any) && apiConfiguration.awsBedrock1MContext && baseInfo) {
 				// Create a new ModelInfo object with updated context window
 				const info: ModelInfo = {
 					...baseInfo,