fix: add 1M context window checkbox for Claude 3.5 Sonnet v2 in Bedrock provider

- Added BEDROCK_CLAUDE_SONNET_4_5_MODEL_ID constant for the newer model
- Updated Bedrock.tsx UI component to show 1M context checkbox for both Sonnet models
- Updated bedrock.ts provider to handle 1M context for both models
- Updated useSelectedModel hook to apply 1M context for both models

Fixes #8381

Author: roomote

.tmp/Roo-Code

@@ -0,0 +1 @@
+Subproject commit 86debeef43acbea9bdc1aa4b38d514541e164c91

packages/types/src/providers/bedrock.ts

@@ -458,3 +458,4 @@ export const BEDROCK_REGIONS = [
 ].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_CLAUDE_SONNET_4_5_MODEL_ID = "anthropic.claude-sonnet-4-5-20250929-v1:0"

src/api/providers/bedrock.ts

@@ -22,6 +22,7 @@ import {
 	BEDROCK_DEFAULT_CONTEXT,
 	AWS_INFERENCE_PROFILE_MAPPING,
 	BEDROCK_CLAUDE_SONNET_4_MODEL_ID,
+	BEDROCK_CLAUDE_SONNET_4_5_MODEL_ID,
 } from "@roo-code/types"
 
 import { ApiStream } from "../transform/stream"
@@ -381,7 +382,9 @@ export class AwsBedrockHandler extends BaseProvider implements SingleCompletionH
 		// Check if 1M context is enabled for Claude Sonnet 4
 		// 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 =
+			(baseModelId === BEDROCK_CLAUDE_SONNET_4_MODEL_ID || baseModelId === BEDROCK_CLAUDE_SONNET_4_5_MODEL_ID) &&
+			this.options.awsBedrock1MContext
 
 		// Add anthropic_beta for 1M context to additionalModelRequestFields
 		if (is1MContextEnabled) {
@@ -979,7 +982,10 @@ export class AwsBedrockHandler extends BaseProvider implements SingleCompletionH
 		// Check if 1M context is enabled for Claude Sonnet 4
 		// 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 (
+			(baseModelId === BEDROCK_CLAUDE_SONNET_4_MODEL_ID || baseModelId === BEDROCK_CLAUDE_SONNET_4_5_MODEL_ID) &&
+			this.options.awsBedrock1MContext
+		) {
 			// Update context window to 1M tokens when 1M context beta is enabled
 			modelConfig.info = {
 				...modelConfig.info,

webview-ui/src/components/settings/providers/Bedrock.tsx

@@ -7,6 +7,7 @@ import {
 	type ModelInfo,
 	BEDROCK_REGIONS,
 	BEDROCK_CLAUDE_SONNET_4_MODEL_ID,
+	BEDROCK_CLAUDE_SONNET_4_5_MODEL_ID,
 } from "@roo-code/types"
 
 import { useAppTranslation } from "@src/i18n/TranslationContext"
@@ -24,8 +25,10 @@ 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 or 4.5)
+	const supports1MContextBeta =
+		apiConfiguration?.apiModelId === BEDROCK_CLAUDE_SONNET_4_MODEL_ID ||
+		apiConfiguration?.apiModelId === BEDROCK_CLAUDE_SONNET_4_5_MODEL_ID
 
 	// Update the endpoint enabled state when the configuration changes
 	useEffect(() => {

webview-ui/src/components/ui/hooks/useSelectedModel.ts

@@ -56,6 +56,7 @@ import {
 	qwenCodeModels,
 	vercelAiGatewayDefaultModelId,
 	BEDROCK_CLAUDE_SONNET_4_MODEL_ID,
+	BEDROCK_CLAUDE_SONNET_4_5_MODEL_ID,
 	deepInfraDefaultModelId,
 } from "@roo-code/types"
 
@@ -200,8 +201,12 @@ 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 or 4.5 when enabled
+			if (
+				(id === BEDROCK_CLAUDE_SONNET_4_MODEL_ID || id === BEDROCK_CLAUDE_SONNET_4_5_MODEL_ID) &&
+				apiConfiguration.awsBedrock1MContext &&
+				baseInfo
+			) {
 				// Create a new ModelInfo object with updated context window
 				const info: ModelInfo = {
 					...baseInfo,