introduce copilot-fast (#1666)

sbatten · web-flow · commit 5dc41783290a · 2025-10-27T19:52:34.000Z
diff --git a/src/extension/conversation/vscode-node/terminalFixGenerator.ts b/src/extension/conversation/vscode-node/terminalFixGenerator.ts
@@ -158,7 +158,7 @@ class TerminalQuickFixGenerator {
 			}
 		}
 
-		const endpoint = await this._endpointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this._endpointProvider.getChatEndpoint('copilot-fast');
 
 		const promptRenderer = PromptRenderer.create(this._instantiationService, endpoint, TerminalQuickFixPrompt, {
 			commandLine: commandMatchResult.commandLine,
@@ -216,7 +216,7 @@ class TerminalQuickFixGenerator {
 	}
 
 	private async _generateTerminalQuickFixFileContext(commandMatchResult: vscode.TerminalCommandMatchResult, token: CancellationToken) {
-		const endpoint = await this._endpointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this._endpointProvider.getChatEndpoint('copilot-fast');
 
 		const promptRenderer = PromptRenderer.create(this._instantiationService, endpoint, TerminalQuickFixFileContextPrompt, {
 			commandLine: commandMatchResult.commandLine,
diff --git a/src/extension/intents/node/generateNewWorkspaceContent.ts b/src/extension/intents/node/generateNewWorkspaceContent.ts
@@ -20,7 +20,7 @@ abstract class NewWorkspaceContentGenerator {
 	) { }
 
 	public async generate(promptArgs: NewWorkspaceContentsPromptProps, token: CancellationToken): Promise<string> {
-		const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');
 		const promptRenderer = PromptRenderer.create(this.instantiationService, endpoint, this.promptType, promptArgs);
 		const prompt = await promptRenderer.render();
 
diff --git a/src/extension/intents/node/searchKeywordsIntent.ts b/src/extension/intents/node/searchKeywordsIntent.ts
@@ -55,7 +55,7 @@ export class SearchKeywordsIntent implements IIntent {
 
 	async invoke(invocationContext: IIntentInvocationContext): Promise<IIntentInvocation> {
 		const location = invocationContext.location;
-		const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');
 		return this.instantiationService.createInstance(SearchKeywordsIntentInvocation, this, location, endpoint);
 	}
 }
diff --git a/src/extension/intents/node/testIntent/userQueryParser.tsx b/src/extension/intents/node/testIntent/userQueryParser.tsx
@@ -32,7 +32,7 @@ export class UserQueryParser {
 	) { }
 
 	public async parse(query: string): Promise<ParsedUserQuery | null> {
-		const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');
 		const promptRenderer = PromptRenderer.create(
 			this.instantiationService,
 			endpoint,
diff --git a/src/extension/prompt/node/githubPullRequestTitleAndDescriptionGenerator.ts b/src/extension/prompt/node/githubPullRequestTitleAndDescriptionGenerator.ts
@@ -80,7 +80,7 @@ export class GitHubPullRequestTitleAndDescriptionGenerator implements TitleAndDe
 		const issues: { reference: string; content: string }[] | undefined = context.issues;
 		const template: string | undefined = context.template;
 
-		const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');
 		const charLimit = Math.floor((endpoint.modelMaxPromptTokens * 4) / 3);
 
 		const prompt = await this.createPRTitleAndDescriptionPrompt(commitMessages, patches, issues, template, charLimit);
@@ -189,7 +189,7 @@ export class GitHubPullRequestTitleAndDescriptionGenerator implements TitleAndDe
 			}
 		}
 
-		const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');
 		const promptRenderer = PromptRenderer.create(this.instantiationService, endpoint, GitHubPullRequestPrompt, { commitMessages, issues, patches, template });
 		return promptRenderer.render(undefined, undefined);
 	}
diff --git a/src/extension/prompt/node/intentDetector.tsx b/src/extension/prompt/node/intentDetector.tsx
@@ -181,7 +181,7 @@ export class IntentDetector implements ChatParticipantDetectionProvider {
 
 		this.logService.trace('Building intent detector');
 
-		const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');
 
 		const preferredIntent = await this.getPreferredIntent(location, documentContext, history, messageText);
 
@@ -254,7 +254,7 @@ export class IntentDetector implements ChatParticipantDetectionProvider {
 		history: Turn[] = [],
 		document?: TextDocumentSnapshot
 	) {
-		const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');
 
 		const { messages: currentSelection } = await renderPromptElement(this.instantiationService, endpoint, CurrentSelection, { document });
 		const { messages: conversationHistory } = await renderPromptElement(this.instantiationService, endpoint, ConversationHistory, { history, priority: 1000 }, undefined, undefined).catch(() => ({ messages: [] }));
diff --git a/src/extension/prompt/node/summarizer.ts b/src/extension/prompt/node/summarizer.ts
@@ -34,7 +34,7 @@ export class ChatSummarizerProvider implements vscode.ChatSummarizer {
 			return '';
 		}
 
-		const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');
 		const promptContext: IBuildPromptContext = {
 			requestId: 'chat-summary',
 			query: '',
diff --git a/src/extension/prompt/node/title.ts b/src/extension/prompt/node/title.ts
@@ -31,7 +31,7 @@ export class ChatTitleProvider implements vscode.ChatTitleProvider {
 			return '';
 		}
 
-		const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');
 		const { messages } = await renderPromptElement(this.instantiationService, endpoint, TitlePrompt, { history: turns });
 		const response = await endpoint.makeChatRequest(
 			'title',
diff --git a/src/extension/prompts/node/panel/chatVariables.tsx b/src/extension/prompts/node/panel/chatVariables.tsx
@@ -353,7 +353,7 @@ export class ChatToolReferences extends PromptElement<ChatToolCallProps, void> {
 				continue;
 			}
 
-			const toolArgsEndpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');
+			const toolArgsEndpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');
 			const internalToolArgs = toolReference.input ?? {};
 			const toolArgs = await this.fetchToolArgs(tool, toolArgsEndpoint);
 
diff --git a/src/extension/prompts/node/panel/newWorkspace/newWorkspace.tsx b/src/extension/prompts/node/panel/newWorkspace/newWorkspace.tsx
@@ -79,7 +79,7 @@ export class NewWorkspacePrompt extends PromptElement<NewWorkspacePromptProps, N
 		}
 
 		progress?.report(new ChatResponseProgressPart(l10n.t('Determining user intent...')));
-		const endpoint = await this.endPointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this.endPointProvider.getChatEndpoint('copilot-fast');
 		const { messages } = await buildNewWorkspaceMetaPrompt(this.instantiationService, endpoint, this.props.promptContext);
 
 		if (token.isCancellationRequested) {
diff --git a/src/extension/prompts/node/panel/startDebugging.tsx b/src/extension/prompts/node/panel/startDebugging.tsx
@@ -234,7 +234,7 @@ export class StartDebuggingPrompt extends PromptElement<StartDebuggingPromptProp
 	}
 
 	private async queryModelForRequestedFiles(debuggerType: string | undefined, progress: vscode.Progress<vscode.ChatResponseProgressPart> | undefined, token: vscode.CancellationToken) {
-		const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');
 		const promptRenderer = this.props.input.type === StartDebuggingType.CommandLine
 			? PromptRenderer.create(
 				this.instantiationService,
@@ -295,7 +295,7 @@ export class StartDebuggingPrompt extends PromptElement<StartDebuggingPromptProp
 	}
 
 	private async getDebuggerType(progress: vscode.Progress<vscode.ChatResponseProgressPart> | undefined, token: vscode.CancellationToken): Promise<string | undefined> {
-		const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');
 
 		const promptRenderer = PromptRenderer.create(
 			this.instantiationService,
diff --git a/src/extension/prompts/node/panel/vscode.tsx b/src/extension/prompts/node/panel/vscode.tsx
@@ -67,7 +67,7 @@ export class VscodePrompt extends PromptElement<VscodePromptProps, VscodePromptS
 		progress?.report(new ChatResponseProgressPart(l10n.t('Refining question to improve search accuracy.')));
 		let userQuery: string = this.props.promptContext.query;
 
-		const endpoint = await this.endPointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this.endPointProvider.getChatEndpoint('copilot-fast');
 		const renderer = PromptRenderer.create(this.instantiationService, endpoint, VscodeMetaPrompt, this.props.promptContext);
 		const { messages } = await renderer.render();
 		if (token.isCancellationRequested) {
diff --git a/src/extension/prompts/node/panel/workspace/workspaceContext.tsx b/src/extension/prompts/node/panel/workspace/workspaceContext.tsx
@@ -271,7 +271,7 @@ export class WorkspaceContext extends PromptElement<WorkspaceContextProps, Works
 			return;
 		}
 
-		const contextEndpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');
+		const contextEndpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');
 		if (token.isCancellationRequested) {
 			throw new CancellationError();
 		}
diff --git a/src/extension/renameSuggestions/node/renameSuggestionsPrompt.tsx b/src/extension/renameSuggestions/node/renameSuggestionsPrompt.tsx
@@ -56,7 +56,7 @@ export class RenameSuggestionsPrompt extends PromptElement<Props, State> {
 		const isDefinitionBeingRenamed = defState.k === 'found' && defState.definitions.some(def => def.excerptRange.contains(this.props.range));
 
 		if (!isDefinitionBeingRenamed) {
-			const endpointInfo = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');
+			const endpointInfo = await this.endpointProvider.getChatEndpoint('copilot-fast');
 			const documentContext: IDocumentContext = {
 				document,
 				fileIndentInfo: undefined,
diff --git a/src/extension/renameSuggestions/node/renameSuggestionsProvider.ts b/src/extension/renameSuggestions/node/renameSuggestionsProvider.ts
@@ -107,7 +107,7 @@ export class RenameSuggestionsProvider implements vscode.NewSymbolNamesProvider
 		if (token.isCancellationRequested) {
 			cancellationReason = ProvideCallCancellationReason.AfterEnablementCheck;
 		} else {
-			const endpoint = await this._endpointProvider.getChatEndpoint('gpt-4o-mini');
+			const endpoint = await this._endpointProvider.getChatEndpoint('copilot-fast');
 			expectedDelayBeforeFetch = this.delayBeforeFetchMs;
 
 			if (token.isCancellationRequested) {
diff --git a/src/extension/test/vscode-node/endpoints.test.ts b/src/extension/test/vscode-node/endpoints.test.ts
@@ -80,8 +80,8 @@ suite('Endpoint Class Test', function () {
 	});
 
 	test('getChatEndpoint by family', async function () {
-		const chatEndpointInfo = await endpointProvider.getChatEndpoint('gpt-4o-mini');
-		assert.strictEqual(chatEndpointInfo.model, CHAT_MODEL.GPT4OMINI);
+		const chatEndpointInfo = await endpointProvider.getChatEndpoint('gpt-5-mini');
+		assert.strictEqual(chatEndpointInfo.model, 'gpt-5-mini');
 	});
 
 	test('Model names have proper casing', async function () {
diff --git a/src/extension/testing/node/aiEvaluationService.tsx b/src/extension/testing/node/aiEvaluationService.tsx
@@ -39,7 +39,7 @@ export class AIEvaluationService implements IAIEvaluationService {
 	}
 
 	async evaluate(response: string, criteria: string, token: CancellationToken): Promise<EvaluationResult> {
-		const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');
 		const promptRenderer = PromptRenderer.create(this.instantiationService, endpoint, EvaluationPrompt, {
 			response, criteria
 		});
diff --git a/src/extension/testing/node/setupTestsFileManager.tsx b/src/extension/testing/node/setupTestsFileManager.tsx
@@ -139,7 +139,7 @@ class WorkspaceMutation implements IWorkspaceMutation {
 		const originalText = document?.getText();
 
 
-		const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');
 		const promptRenderer = PromptRenderer.create(this.instantiationService, endpoint, WorkspaceMutationFilePrompt, {
 			file,
 			document,
@@ -174,7 +174,7 @@ class WorkspaceMutation implements IWorkspaceMutation {
 	}
 
 	private async getFileDescriptions() {
-		const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');
+		const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');
 		const promptRenderer = PromptRenderer.create(this.instantiationService, endpoint, WorkspaceMutationInstructionsPrompt, {
 			fileTreeStr: this.opts.fileTree,
 			query: this.opts.query,
diff --git a/src/extension/tools/common/virtualTools/virtualToolGrouper.ts b/src/extension/tools/common/virtualTools/virtualToolGrouper.ts
@@ -4,7 +4,7 @@
  *--------------------------------------------------------------------------------------------*/
 
 import type { LanguageModelToolInformation } from 'vscode';
-import { CHAT_MODEL, ConfigKey, IConfigurationService } from '../../../../platform/configuration/common/configurationService';
+import { ConfigKey, IConfigurationService } from '../../../../platform/configuration/common/configurationService';
 import { IEmbeddingsComputer } from '../../../../platform/embeddings/common/embeddingsComputer';
 import { IEndpointProvider } from '../../../../platform/endpoint/common/endpointProvider';
 import { ILogService } from '../../../../platform/log/common/logService';
@@ -25,7 +25,7 @@ import { TOOLS_AND_GROUPS_LIMIT } from './virtualToolsConstants';
 import { describeBulkToolGroups } from './virtualToolSummarizer';
 import { ISummarizedToolCategory, ISummarizedToolCategoryUpdatable, IToolCategorization, IToolGroupingCache } from './virtualToolTypes';
 
-const CATEGORIZATION_ENDPOINT = CHAT_MODEL.GPT4OMINI;
+const CATEGORIZATION_ENDPOINT = 'copilot-fast';
 const SUMMARY_PREFIX = 'Call this tool when you need access to a new category of tools. The category of tools is described as follows:\n\n';
 const SUMMARY_SUFFIX = '\n\nBe sure to call this tool if you need a capability related to the above.';
 
diff --git a/src/extension/tools/node/abstractReplaceStringTool.tsx b/src/extension/tools/node/abstractReplaceStringTool.tsx
@@ -4,7 +4,7 @@
  *--------------------------------------------------------------------------------------------*/
 
 import type * as vscode from 'vscode';
-import { CHAT_MODEL, IConfigurationService } from '../../../platform/configuration/common/configurationService';
+import { IConfigurationService } from '../../../platform/configuration/common/configurationService';
 import { IEditSurvivalTrackerService, IEditSurvivalTrackingSession } from '../../../platform/editSurvivalTracking/common/editSurvivalTrackerService';
 import { NotebookDocumentSnapshot } from '../../../platform/editing/common/notebookDocumentSnapshot';
 import { TextDocumentSnapshot } from '../../../platform/editing/common/textDocumentSnapshot';
@@ -332,7 +332,7 @@ export abstract class AbstractReplaceStringTool<T extends { explanation: string
 						newString,
 					},
 					eol,
-					await this.endpointProvider.getChatEndpoint(CHAT_MODEL.GPT4OMINI),
+					await this.endpointProvider.getChatEndpoint('copilot-fast'),
 					token
 				);
 				if (healed.params.oldString === healed.params.newString) {
diff --git a/src/extension/tools/node/applyPatchTool.tsx b/src/extension/tools/node/applyPatchTool.tsx
@@ -6,7 +6,6 @@
 import { BasePromptElementProps, PromptElement, PromptPiece, SystemMessage, UserMessage } from '@vscode/prompt-tsx';
 import type * as vscode from 'vscode';
 import { ChatFetchResponseType, ChatLocation } from '../../../platform/chat/common/commonTypes';
-import { CHAT_MODEL } from '../../../platform/configuration/common/configurationService';
 import { StringTextDocumentWithLanguageId } from '../../../platform/editing/common/abstractText';
 import { NotebookDocumentSnapshot } from '../../../platform/editing/common/notebookDocumentSnapshot';
 import { TextDocumentSnapshot } from '../../../platform/editing/common/textDocumentSnapshot';
@@ -426,7 +425,7 @@ export class ApplyPatchTool implements ICopilotTool<IApplyPatchToolParams> {
 	 * and do another turn.
 	 */
 	private async healCommit(patch: string, docs: DocText, explanation: string, token: CancellationToken) {
-		const endpoint = await this.endpointProvider.getChatEndpoint(CHAT_MODEL.GPT4OMINI);
+		const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');
 		const prompt = await PromptRenderer.create(
 			this.instantiationService,
 			endpoint,
diff --git a/src/extension/workspaceSemanticSearch/node/semanticSearchTextSearchProvider.ts b/src/extension/workspaceSemanticSearch/node/semanticSearchTextSearchProvider.ts
@@ -77,7 +77,7 @@ export class SemanticSearchTextSearchProvider implements vscode.AITextSearchProv
 	) { }
 
 	private async getEndpoint() {
-		this._endpoint = this._endpoint ?? await this._endpointProvider.getChatEndpoint('gpt-4o-mini');
+		this._endpoint = this._endpoint ?? await this._endpointProvider.getChatEndpoint('copilot-fast');
 		return this._endpoint;
 	}
 
diff --git a/src/platform/endpoint/common/endpointProvider.ts b/src/platform/endpoint/common/endpointProvider.ts
@@ -113,7 +113,7 @@ export function isCompletionModelInformation(model: IModelAPIResponse): model is
 	return model.capabilities.type === 'completion';
 }
 
-export type ChatEndpointFamily = 'gpt-4.1' | 'gpt-4o-mini' | 'gpt-5-mini' | 'copilot-base';
+export type ChatEndpointFamily = 'gpt-4.1' | 'gpt-5-mini' | 'copilot-base' | 'copilot-fast';
 export type EmbeddingsEndpointFamily = 'text3small' | 'metis';
 
 export interface IEndpointProvider {
diff --git a/src/platform/endpoint/node/modelMetadataFetcher.ts b/src/platform/endpoint/node/modelMetadataFetcher.ts
@@ -161,7 +161,7 @@ export class ModelMetadataFetcher extends Disposable implements IModelMetadataFe
 		let resolvedModel: IModelAPIResponse | undefined;
 		if (family === 'gpt-4.1') {
 			resolvedModel = this._familyMap.get('gpt-4.1')?.[0] ?? this._familyMap.get('gpt-4o')?.[0];
-		} else if (family === 'gpt-4o-mini') {
+		} else if (family === 'copilot-fast') {
 			resolvedModel = this._familyMap.get('gpt-4o-mini')?.[0];
 		} else if (family === 'copilot-base') {
 			resolvedModel = this._copilotBaseModel;

Original file line number	Diff line number	Diff line change
`@@ -158,7 +158,7 @@ class TerminalQuickFixGenerator {`
`158`	`158`	`}`
`159`	`159`	`}`
`160`	`160`
`161`		`- const endpoint = await this._endpointProvider.getChatEndpoint('gpt-4o-mini');`
	`161`	`+ const endpoint = await this._endpointProvider.getChatEndpoint('copilot-fast');`
`162`	`162`
`163`	`163`	`const promptRenderer = PromptRenderer.create(this._instantiationService, endpoint, TerminalQuickFixPrompt, {`
`164`	`164`	`commandLine: commandMatchResult.commandLine,`
`@@ -216,7 +216,7 @@ class TerminalQuickFixGenerator {`
`216`	`216`	`}`
`217`	`217`
`218`	`218`	`private async _generateTerminalQuickFixFileContext(commandMatchResult: vscode.TerminalCommandMatchResult, token: CancellationToken) {`
`219`		`- const endpoint = await this._endpointProvider.getChatEndpoint('gpt-4o-mini');`
	`219`	`+ const endpoint = await this._endpointProvider.getChatEndpoint('copilot-fast');`
`220`	`220`
`221`	`221`	`const promptRenderer = PromptRenderer.create(this._instantiationService, endpoint, TerminalQuickFixFileContextPrompt, {`
`222`	`222`	`commandLine: commandMatchResult.commandLine,`
Original file line number	Diff line number	Diff line change
`@@ -55,7 +55,7 @@ export class SearchKeywordsIntent implements IIntent {`
`55`	`55`
`56`	`56`	`async invoke(invocationContext: IIntentInvocationContext): Promise<IIntentInvocation> {`
`57`	`57`	`const location = invocationContext.location;`
`58`		`- const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');`
	`58`	`+ const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');`
`59`	`59`	`return this.instantiationService.createInstance(SearchKeywordsIntentInvocation, this, location, endpoint);`
`60`	`60`	`}`
`61`	`61`	`}`
Original file line number	Diff line number	Diff line change
`@@ -80,7 +80,7 @@ export class GitHubPullRequestTitleAndDescriptionGenerator implements TitleAndDe`
`80`	`80`	`const issues: { reference: string; content: string }[] \| undefined = context.issues;`
`81`	`81`	`const template: string \| undefined = context.template;`
`82`	`82`
`83`		`- const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');`
	`83`	`+ const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');`
`84`	`84`	`const charLimit = Math.floor((endpoint.modelMaxPromptTokens * 4) / 3);`
`85`	`85`
`86`	`86`	`const prompt = await this.createPRTitleAndDescriptionPrompt(commitMessages, patches, issues, template, charLimit);`
`@@ -189,7 +189,7 @@ export class GitHubPullRequestTitleAndDescriptionGenerator implements TitleAndDe`
`189`	`189`	`}`
`190`	`190`	`}`
`191`	`191`
`192`		`- const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');`
	`192`	`+ const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');`
`193`	`193`	`const promptRenderer = PromptRenderer.create(this.instantiationService, endpoint, GitHubPullRequestPrompt, { commitMessages, issues, patches, template });`
`194`	`194`	`return promptRenderer.render(undefined, undefined);`
`195`	`195`	`}`
Original file line number	Diff line number	Diff line change
`@@ -34,7 +34,7 @@ export class ChatSummarizerProvider implements vscode.ChatSummarizer {`
`34`	`34`	`return '';`
`35`	`35`	`}`
`36`	`36`
`37`		`- const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');`
	`37`	`+ const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');`
`38`	`38`	`const promptContext: IBuildPromptContext = {`
`39`	`39`	`requestId: 'chat-summary',`
`40`	`40`	`query: '',`
Original file line number	Diff line number	Diff line change
`@@ -31,7 +31,7 @@ export class ChatTitleProvider implements vscode.ChatTitleProvider {`
`31`	`31`	`return '';`
`32`	`32`	`}`
`33`	`33`
`34`		`- const endpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');`
	`34`	`+ const endpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');`
`35`	`35`	`const { messages } = await renderPromptElement(this.instantiationService, endpoint, TitlePrompt, { history: turns });`
`36`	`36`	`const response = await endpoint.makeChatRequest(`
`37`	`37`	`'title',`
Original file line number	Diff line number	Diff line change
`@@ -353,7 +353,7 @@ export class ChatToolReferences extends PromptElement<ChatToolCallProps, void> {`
`353`	`353`	`continue;`
`354`	`354`	`}`
`355`	`355`
`356`		`- const toolArgsEndpoint = await this.endpointProvider.getChatEndpoint('gpt-4o-mini');`
	`356`	`+ const toolArgsEndpoint = await this.endpointProvider.getChatEndpoint('copilot-fast');`
`357`	`357`	`const internalToolArgs = toolReference.input ?? {};`
`358`	`358`	`const toolArgs = await this.fetchToolArgs(tool, toolArgsEndpoint);`
`359`	`359`
Original file line number	Diff line number	Diff line change
`@@ -79,7 +79,7 @@ export class NewWorkspacePrompt extends PromptElement<NewWorkspacePromptProps, N`
`79`	`79`	`}`
`80`	`80`
`81`	`81`	`progress?.report(new ChatResponseProgressPart(l10n.t('Determining user intent...')));`
`82`		`- const endpoint = await this.endPointProvider.getChatEndpoint('gpt-4o-mini');`
	`82`	`+ const endpoint = await this.endPointProvider.getChatEndpoint('copilot-fast');`
`83`	`83`	`const { messages } = await buildNewWorkspaceMetaPrompt(this.instantiationService, endpoint, this.props.promptContext);`
`84`	`84`
`85`	`85`	`if (token.isCancellationRequested) {`