feat(models): add gemini-3-flash

Author: steipete

Sources/Tachikoma/Models/Model.swift

@@ -238,6 +238,7 @@ public enum LanguageModel: Sendable, CustomStringConvertible, Hashable {
     }
 
     public enum Google: String, Sendable, Hashable, CaseIterable {
+        case gemini3Flash = "gemini-3-flash"
         case gemini25Pro = "gemini-2.5-pro"
         case gemini25Flash = "gemini-2.5-flash"
         case gemini25FlashLite = "gemini-2.5-flash-lite"
@@ -247,7 +248,7 @@ public enum LanguageModel: Sendable, CustomStringConvertible, Hashable {
 
         public var supportsAudioInput: Bool {
             switch self {
-            case .gemini25Pro, .gemini25Flash:
+            case .gemini3Flash, .gemini25Pro, .gemini25Flash:
                 true
             case .gemini25FlashLite:
                 false
@@ -258,7 +259,7 @@ public enum LanguageModel: Sendable, CustomStringConvertible, Hashable {
 
         public var contextLength: Int {
             switch self {
-            case .gemini25Pro, .gemini25Flash:
+            case .gemini3Flash, .gemini25Pro, .gemini25Flash:
                 1_048_576
             case .gemini25FlashLite:
                 524_288
@@ -1178,6 +1179,42 @@ extension LanguageModel {
             return .anthropic(.sonnet45)
         }
 
+        // MARK: Google models
+
+        if dashed.contains("gemini-3-flash") || compact.contains("gemini3flash") {
+            return .google(.gemini3Flash)
+        }
+
+        if dashed.contains("gemini-2.5-pro") || dotted.contains("gemini-2-5-pro") || compact.contains("gemini25pro") {
+            return .google(.gemini25Pro)
+        }
+
+        if
+            dashed.contains("gemini-2.5-flash-lite") || dotted.contains("gemini-2-5-flash-lite") || compact
+                .contains("gemini25flashlite")
+        {
+            return .google(.gemini25FlashLite)
+        }
+
+        if
+            dashed.contains("gemini-2.5-flash") || dotted.contains("gemini-2-5-flash") || compact
+                .contains("gemini25flash")
+        {
+            return .google(.gemini25Flash)
+        }
+
+        let genericGeminiIdentifiers: Set<String> = [
+            "gemini",
+            "geminiflash",
+            "gemini-flash",
+            "gemini_flash",
+            "google",
+        ]
+
+        if canonicalForms.contains(where: { genericGeminiIdentifiers.contains($0) }) {
+            return .google(.gemini3Flash)
+        }
+
         // MARK: Grok models
 
         if dotted.contains("grok-4-fast-reasoning") || compact.contains("grok4fastreasoning") {

Sources/Tachikoma/Models/ModelSelection.swift

@@ -152,14 +152,16 @@ public struct ModelSelector {
 
     private static func parseGoogleModel(_ input: String) -> Model.Google? {
         switch input {
+        case "gemini-3-flash", "gemini3flash", "gemini-3flash":
+            .gemini3Flash
         case "gemini-2.5-pro", "gemini25pro", "gemini2.5pro":
             .gemini25Pro
         case "gemini-2.5-flash", "gemini25flash":
             .gemini25Flash
         case "gemini-2.5-flash-lite", "gemini25flashlite", "gemini-2.5-flashlite":
             .gemini25FlashLite
         case "gemini":
-            .gemini25Flash
+            .gemini3Flash
         case "google":
             .gemini25Pro
         default:
@@ -379,7 +381,7 @@ public func getAllAvailableModels() -> String {
     output += "\nShortcuts:\n"
     output += "  • claude, claude-opus, opus → claude-opus-4-20250514\n"
     output += "  • gpt, gpt4 → gpt-4.1\n"
-    output += "  • gemini → gemini-2.5-flash\n"
+    output += "  • gemini → gemini-3-flash\n"
     output += "  • grok → grok-4-fast-reasoning\n"
     output += "  • llama, llama3 → llama3.3\n"
 
@@ -414,13 +416,13 @@ extension ModelSelector {
         case .coding:
             [.claude, .gpt4o, .google(.gemini25Pro)]
         case .vision:
-            [.claude, .gpt4o, .google(.gemini25Flash)]
+            [.claude, .gpt4o, .google(.gemini3Flash)]
         case .reasoning:
             [.openai(.gpt51Mini), .claude, .google(.gemini25Pro)]
         case .local:
             [.llama, .ollama(.mistralNemo), .ollama(.commandRPlus)]
         case .general:
-            [.claude, .gpt4o, .google(.gemini25Flash), .grok(.grok4FastReasoning), .llama]
+            [.claude, .gpt4o, .google(.gemini3Flash), .grok(.grok4FastReasoning), .llama]
         }
     }
 }

Sources/Tachikoma/Providers/ProviderParser.swift

@@ -232,14 +232,16 @@ public enum ProviderParser {
 
     private static func parseGoogleModel(_ modelString: String) -> LanguageModel? {
         switch modelString.lowercased() {
+        case "gemini-3-flash", "gemini3flash", "gemini-3flash":
+            .google(.gemini3Flash)
         case "gemini-2.5-pro", "gemini25pro", "gemini2.5pro":
             .google(.gemini25Pro)
         case "gemini-2.5-flash", "gemini25flash":
             .google(.gemini25Flash)
         case "gemini-2.5-flash-lite", "gemini25flashlite", "gemini-2.5-flashlite":
             .google(.gemini25FlashLite)
         case "gemini":
-            .google(.gemini25Flash)
+            .google(.gemini3Flash)
         default:
             nil
         }

Sources/Tachikoma/Utilities/UsageTracking.swift

@@ -550,6 +550,7 @@ public struct ModelCostCalculator: Sendable {
         // Google Pricing (estimates)
         case let .google(googleModel):
             switch googleModel {
+            case .gemini3Flash: (0.50, 3.00)
             case .gemini25Pro: (1.25, 10.00)
             case .gemini25Flash: (0.30, 2.50)
             case .gemini25FlashLite: (0.10, 0.40)