feat: add checkbox to control maximum context window for magistral-medium model

- Added useMaximumContextWindow field to provider settings schema
- Implemented checkbox UI in Mistral provider settings with yellow warning
- Updated context window logic to limit to 41k tokens when checkbox is unchecked
- Added localization strings for the new feature

This allows users to opt-in to using the full 128k context window for the magistral-medium-latest model, with a warning about potential performance degradation.

packages/types/src/provider-settings.ts

@@ -111,6 +111,9 @@ const baseProviderSettingsSchema = z.object({
 
 	// Model verbosity.
 	verbosity: verbosityLevelsSchema.optional(),
+
+	// Context window settings.
+	useMaximumContextWindow: z.boolean().optional(),
 })
 
 // Several of the providers share common model config properties.

packages/types/src/providers/mistral.ts

@@ -7,10 +7,11 @@ export const mistralDefaultModelId: MistralModelId = "codestral-latest"
 
 export const mistralModels = {
 	"magistral-medium-latest": {
-		maxTokens: 41_000,
-		contextWindow: 41_000,
+		maxTokens: 128_000,
+		contextWindow: 128_000,
 		supportsImages: false,
 		supportsPromptCache: false,
+		supportsReasoningBudget: true,
 		inputPrice: 2.0,
 		outputPrice: 5.0,
 	},

src/api/providers/mistral.ts

@@ -95,7 +95,17 @@ export class MistralHandler extends BaseProvider implements SingleCompletionHand
 
 	override getModel() {
 		const id = this.options.apiModelId ?? mistralDefaultModelId
-		const info = mistralModels[id as MistralModelId] ?? mistralModels[mistralDefaultModelId]
+		let info = mistralModels[id as MistralModelId] ?? mistralModels[mistralDefaultModelId]
+
+		// For magistral-medium-latest, optionally limit context window if useMaximumContextWindow is false
+		if (id === "magistral-medium-latest" && !this.options.useMaximumContextWindow && info.contextWindow > 41000) {
+			// Create a modified info object with reduced context window for better performance
+			info = {
+				...info,
+				contextWindow: 41000,
+				maxTokens: 41000,
+			}
+		}
 
 		// @TODO: Move this to the `getModelParams` function.
 		const maxTokens = this.options.includeMaxTokens ? info.maxTokens : undefined

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

@@ -1,12 +1,13 @@
 import { useCallback } from "react"
 import { VSCodeTextField } from "@vscode/webview-ui-toolkit/react"
 
-import { type ProviderSettings, mistralDefaultModelId } from "@roo-code/types"
+import { type ProviderSettings, mistralDefaultModelId, mistralModels } from "@roo-code/types"
 
 import type { RouterModels } from "@roo/api"
 
 import { useAppTranslation } from "@src/i18n/TranslationContext"
 import { VSCodeButtonLink } from "@src/components/common/VSCodeButtonLink"
+import { Checkbox } from "@src/components/ui"
 
 import { inputEventTransform } from "../transforms"
 
@@ -30,6 +31,15 @@ export const Mistral = ({ apiConfiguration, setApiConfigurationField }: MistralP
 		[setApiConfigurationField],
 	)
 
+	// Check if the current model is magistral-medium-latest
+	const isMagistralMedium =
+		apiConfiguration?.apiModelId === "magistral-medium-latest" ||
+		(!apiConfiguration?.apiModelId && mistralDefaultModelId === "magistral-medium-latest")
+
+	// Get the model info for magistral-medium-latest
+	const magistralMediumModel = mistralModels["magistral-medium-latest"]
+	const hasLargeContext = magistralMediumModel && magistralMediumModel.contextWindow >= 100000
+
 	return (
 		<>
 			<VSCodeTextField
@@ -48,6 +58,23 @@ export const Mistral = ({ apiConfiguration, setApiConfigurationField }: MistralP
 					{t("settings:providers.getMistralApiKey")}
 				</VSCodeButtonLink>
 			)}
+			{isMagistralMedium && hasLargeContext && (
+				<div className="flex flex-col gap-2">
+					<Checkbox
+						checked={apiConfiguration?.useMaximumContextWindow || false}
+						onChange={(checked: boolean) => setApiConfigurationField("useMaximumContextWindow", checked)}>
+						{t("settings:providers.mistral.useMaximumContextWindow")}
+					</Checkbox>
+					{apiConfiguration?.useMaximumContextWindow && (
+						<div className="flex items-start gap-2 p-2 rounded-md bg-[color-mix(in_srgb,var(--vscode-editorWarning-foreground)_20%,transparent)] border border-[var(--vscode-editorWarning-foreground)]">
+							<span className="codicon codicon-warning text-[var(--vscode-editorWarning-foreground)] mt-0.5"></span>
+							<div className="text-sm text-[var(--vscode-editorWarning-foreground)]">
+								{t("settings:providers.mistral.contextWindowWarning")}
+							</div>
+						</div>
+					)}
+				</div>
+			)}
 			{(apiConfiguration?.apiModelId?.startsWith("codestral-") ||
 				(!apiConfiguration?.apiModelId && mistralDefaultModelId.startsWith("codestral-"))) && (
 				<>

webview-ui/src/i18n/locales/en/settings.json

@@ -313,6 +313,10 @@
 		"getMistralApiKey": "Get Mistral / Codestral API Key",
 		"codestralBaseUrl": "Codestral Base URL (Optional)",
 		"codestralBaseUrlDesc": "Set an alternative URL for the Codestral model.",
+		"mistral": {
+			"useMaximumContextWindow": "Use maximum context window (128k tokens)",
+			"contextWindowWarning": "Using the full 128k context window may significantly degrade performance. Consider using a smaller context for better responsiveness unless you specifically need the extended context."
+		},
 		"xaiApiKey": "xAI API Key",
 		"getXaiApiKey": "Get xAI API Key",
 		"litellmApiKey": "LiteLLM API Key",