[iOS] - Remove Claude Instant Strings and Rename Llama 13B (#23911)

- Remove ClaudeInstant.
- Rename Llama 13B to Llama 3 8B.

Author: Brandon-T

ios/brave-ios/Sources/AIChat/AIChatStrings.swift

@@ -211,20 +211,60 @@ extension Strings {
       comment:
         "The model and creator for intro message - Mixstral is the model name -- Mistral AI is the creator"
     )
-    public static let introMessageClaudeInstantModelDescription = NSLocalizedString(
-      "aichat.introMessageClaudeInstantModelDescription",
+    public static let introMessageClaudeHaikuModelDescription = NSLocalizedString(
+      "aichat.introMessageClaudeHaikuModelDescription",
       tableName: "BraveLeo",
       bundle: .module,
-      value: "Claude Instant by Anthropic",
+      value: "Claude Haiku by Anthropic",
       comment:
-        "The model and creator for intro message - Claude Instant is the model -- Anthropic is the creator"
+        "The model and creator for intro message - Claude Haiku is the model -- Anthropic is the creator"
+    )
+    public static let introMessageClaudeSonnetModelDescription = NSLocalizedString(
+      "aichat.introMessageClaudeSonnetModelDescription",
+      tableName: "BraveLeo",
+      bundle: .module,
+      value: "Claude Sonnet by Anthropic",
+      comment:
+        "The model and creator for intro message - Claude Sonnet is the model -- Anthropic is the creator"
+    )
+    public static let introMessageLlamaModelPurposeDescription = NSLocalizedString(
+      "aichat.introMessageLlamaModelPurposeDescription",
+      tableName: "BraveLeo",
+      bundle: .module,
+      value: "General purpose chat",
+      comment:
+        "The model's purpose - Describes what it can do best"
+    )
+    public static let introMessageMixtralModelPurposeDescription = NSLocalizedString(
+      "aichat.introMessageMixtralModelPurposeDescription",
+      tableName: "BraveLeo",
+      bundle: .module,
+      value: "Advanced chat tasks",
+      comment:
+        "The model's purpose - Describes what it can do best"
+    )
+    public static let introMessageClaudeHaikuModelPurposeDescription = NSLocalizedString(
+      "aichat.introMessageClaudeHaikuModelPurposeDescription",
+      tableName: "BraveLeo",
+      bundle: .module,
+      value: "Lightning fast chat",
+      comment:
+        "The model's purpose - Describes what it can do best"
+    )
+    public static let introMessageClaudeSonnetModelPurposeDescription = NSLocalizedString(
+      "aichat.introMessageClaudeSonnetModelPurposeDescription",
+      tableName: "BraveLeo",
+      bundle: .module,
+      value: "Balanced speed and intelligence",
+      comment:
+        "The model's purpose - Describes what it can do best"
     )
     public static let introMessageLlamaMessageDescription = NSLocalizedString(
       "aichat.introMessageLlamaMessageDescription",
       tableName: "BraveLeo",
       bundle: .module,
       value:
-        "Hi, I'm Leo. I'm a fully hosted AI assistant by Brave. I'm powered by Llama 13B, a model created by Meta to be performant and applicable to many use cases.",
+        "Hi, I'm Leo. I'm a fully hosted AI assistant by Brave. I'm powered by Llama 3 8B, a model created by Meta to be performant and applicable to many use cases.",
       comment: "The model intro message when you first enter the chat assistant"
     )
     public static let introMessageMixtralMessageDescription = NSLocalizedString(
@@ -235,12 +275,20 @@ extension Strings {
         "Hi, I'm Leo. I'm a fully hosted AI assistant by Brave. I'm powered by Mixtral 8x7B, a model created by Mistral AI to handle advanced tasks.",
       comment: "The model intro message when you first enter the chat assistant"
     )
-    public static let introMessageClaudeInstantMessageDescription = NSLocalizedString(
-      "aichat.introMessageClaudeInstantMessageDescription",
+    public static let introMessageClaudeHaikuMessageDescription = NSLocalizedString(
+      "aichat.introMessageClaudeHaikuMessageDescription",
+      tableName: "BraveLeo",
+      bundle: .module,
+      value:
+        "Hi, I'm Leo. I'm proxied by Brave and powered by Claude 3 Haiku, a model created by Anthropic to power conversational and text processing tasks.",
+      comment: "The model intro message when you first enter the chat assistant"
+    )
+    public static let introMessageClaudeSonnetMessageDescription = NSLocalizedString(
+      "aichat.introMessageClaudeSonnetMessageDescription",
       tableName: "BraveLeo",
       bundle: .module,
       value:
-        "Hi, I'm Leo. I'm proxied by Brave and powered by Claude Instant, a model created by Anthropic to power conversational and text processing tasks.",
+        "Hi, I'm Leo. I'm proxied by Brave and powered by Claude 3 Sonnet, a model created by Anthropic to power conversational and text processing tasks.",
       comment: "The model intro message when you first enter the chat assistant"
     )
     public static let introMessageGenericMessageDescription = NSLocalizedString(

ios/brave-ios/Sources/AIChat/Components/Messages/AIChatIntroMessageView.swift

@@ -13,7 +13,8 @@ struct AIChatIntroMessageView: View {
   private enum ModelKey: String {
     case chatBasic = "chat-basic"
     case chatExpanded = "chat-leo-expanded"
-    case chatClaudeInstant = "chat-claude-instant"
+    case chatClaudeHaiku = "chat-claude-haiku"
+    case chatClaudeSonnet = "chat-claude-sonnet"
   }
 
   private var modelDescription: String {
@@ -28,8 +29,11 @@ struct AIChatIntroMessageView: View {
     case .chatExpanded:
       return Strings.AIChat.introMessageMixtralModelDescription
 
-    case .chatClaudeInstant:
-      return Strings.AIChat.introMessageClaudeInstantModelDescription
+    case .chatClaudeHaiku:
+      return Strings.AIChat.introMessageClaudeHaikuModelDescription
+
+    case .chatClaudeSonnet:
+      return Strings.AIChat.introMessageClaudeSonnetModelDescription
     }
   }
 
@@ -45,8 +49,11 @@ struct AIChatIntroMessageView: View {
     case .chatExpanded:
       return Strings.AIChat.introMessageMixtralMessageDescription
 
-    case .chatClaudeInstant:
-      return Strings.AIChat.introMessageClaudeInstantMessageDescription
+    case .chatClaudeHaiku:
+      return Strings.AIChat.introMessageClaudeHaikuMessageDescription
+
+    case .chatClaudeSonnet:
+      return Strings.AIChat.introMessageClaudeSonnetMessageDescription
     }
   }
 

ios/brave-ios/Sources/AIChat/Components/Settings/AIChatMenuView.swift

@@ -227,6 +227,26 @@ struct AIChatMenuView: View {
     }
   }
 
+  private func modelPurpose(for model: AiChat.Model) -> String {
+    guard let modelKey = AIChatModelKey(rawValue: model.key) else {
+      return model.displayMaker
+    }
+
+    switch modelKey {
+    case .chatBasic:
+      return Strings.AIChat.introMessageLlamaModelPurposeDescription
+
+    case .chatExpanded:
+      return Strings.AIChat.introMessageMixtralModelPurposeDescription
+
+    case .chatClaudeHaiku:
+      return Strings.AIChat.introMessageClaudeHaikuModelPurposeDescription
+
+    case .chatClaudeSonnet:
+      return Strings.AIChat.introMessageClaudeSonnetModelPurposeDescription
+    }
+  }
+
   func menuActionItems(for menuOption: AIChatMenuOptionTypes) -> some View {
     Button {
       if menuOption == .goPremium, !BraveStoreSDK.shared.isLeoProductsLoaded {

ios/brave-ios/Sources/AIChat/ModelView/AIChatViewModel.swift

@@ -10,6 +10,13 @@ import Shared
 import SwiftUI
 import WebKit
 
+public enum AIChatModelKey: String {
+  case chatBasic = "chat-basic"
+  case chatExpanded = "chat-leo-expanded"
+  case chatClaudeHaiku = "chat-claude-haiku"
+  case chatClaudeSonnet = "chat-claude-sonnet"
+}
+
 public class AIChatViewModel: NSObject, ObservableObject {
   private var api: AIChat!
   private weak var webView: WKWebView?