feature: deploy to App Store

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ concurrency:
 jobs:
   test-ios:
     name: Build & Test (iOS)
-    runs-on: macos-26
+    runs-on: xcode-27
     steps:
       - uses: actions/checkout@v5
 
@@ -92,4 +92,4 @@ jobs:
             CODE_SIGN_IDENTITY="" \
             CODE_SIGNING_REQUIRED=NO \
             CODE_SIGNING_ALLOWED=NO \
-            | xcpretty && exit ${PIPESTATUS[0]}
+            | xcpretty && exit ${PIPESTATUS[0]}

CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 Contributions are welcome — see [CONTRIBUTING.md](CONTRIBUTING.md) for guidelines.
 
+## [1.7.15-build-117] - 2026-09-24
+
+### Fixed
+
+- Image generation with GPT Image models no longer fails because of an unsupported response format parameter
+
 ## [1.7.10-build-115] - 2026-09-19
 
 ### Changed

README.md

@@ -8,7 +8,7 @@
   <img src="https://img.shields.io/badge/License-AGPL%20v3.0-blue?style=flat-square" alt="License" />
   <img src="https://img.shields.io/badge/Platform-iOS%2026+%20|%20iPadOS%2026+%20|%20macOS%2026+-blue?style=flat-square" alt="Platform" />
   <img src="https://img.shields.io/badge/Swift-6+-orange?style=flat-square&logo=swift" alt="Swift" />
-  <img src="https://img.shields.io/badge/Version-1.7.10-brightgreen?style=flat-square" alt="Version 1.7.10" />
+  <img src="https://img.shields.io/badge/Version-1.7.15-brightgreen?style=flat-square" alt="Version 1.7.15" />
 </p>
 
 OpenClient connects directly to the AI server you configure, without an OpenClient-hosted proxy or subscription.

TestFlight/WhatToTest.en-US.txt

@@ -5,6 +5,7 @@ Hi there! We've got some great new features for you in this update.
 • Announcements on the Home screen now animate into view on Mac with the same smooth transition used on iPhone and iPad.
 • Your conversation list no longer shows a duplicate separator above your chats.
 • The Models screen no longer repeats requests while loading, so it stays responsive.
+• Image generation now works with GPT Image models through LiteLLM, without requests failing because of an unsupported setting.
 • Minor bug fixes and improvements for a smoother experience.
 
 Thanks for your continued support and for helping us build the best possible LLM client together.

TestFlight/WhatToTest.es-ES.txt

@@ -5,6 +5,7 @@
 • Los anuncios de la pantalla de Inicio ahora aparecen con una animación fluida en Mac, con la misma transición que en iPhone e iPad.
 • La lista de conversaciones ya no muestra un separador duplicado encima de tus chats.
 • La pantalla de Modelos ya no repite solicitudes mientras se carga, para mantenerse ágil.
+• La generación de imágenes ya funciona con modelos GPT Image a través de LiteLLM, sin que las solicitudes fallen por un ajuste no compatible.
 • Pequeñas correcciones de errores y mejoras para disfrutar de una experiencia más fluida.
 
 Gracias por seguir apoyándonos y por ayudarnos a crear juntos el mejor cliente posible para modelos de lenguaje.

openclient-llm-test/Features/Chat/ConversationListViewModelTests+Loading.swift

@@ -6,6 +6,7 @@
 //  Copyright © 2026 Arturo Carretero Calvo. All rights reserved.
 //
 
+import Observation
 import XCTest
 @testable import openclient_llm
 
@@ -21,10 +22,12 @@ extension ConversationListViewModelTests {
         ]
         mockLoadConversations.result = .success(conversations)
         mockFetchModels.result = .success([LLMModel(id: "gpt-4")])
+        let modelsLoaded = expectation(description: "Available models loaded")
 
         // When
         sut.send(.viewAppeared)
-        for _ in 0..<10 { await Task.yield() }
+        Self.observeModelsLoaded(sut, expectation: modelsLoaded)
+        await fulfillment(of: [modelsLoaded], timeout: 2)
 
         // Then
         guard case .loaded(let loadedState) = sut.state else {
@@ -94,3 +97,22 @@ extension ConversationListViewModelTests {
         XCTAssertTrue(loadedState.availableModels.isEmpty)
     }
 }
+
+// MARK: - Private
+
+private extension ConversationListViewModelTests {
+    static func observeModelsLoaded(_ sut: ConversationListViewModel, expectation: XCTestExpectation) {
+        if case .loaded(let loadedState) = sut.state, !loadedState.availableModels.isEmpty {
+            expectation.fulfill()
+            return
+        }
+        withObservationTracking {
+            _ = sut.state
+        } onChange: { [weak sut] in
+            Task { @MainActor in
+                guard let sut else { return }
+                observeModelsLoaded(sut, expectation: expectation)
+            }
+        }
+    }
+}

openclient-llm-test/Features/ImageGeneration/ImageGenerationRepositoryTests.swift

@@ -30,6 +30,55 @@ final class ImageGenerationRepositoryTests: XCTestCase {
         XCTAssertEqual(apiClient.lastRequestEndpoint, "images/generations")
         XCTAssertEqual(apiClient.lastRequestTimeoutInterval, 600)
         XCTAssertNil(apiClient.lastMultipartEndpoint)
+        let body = try XCTUnwrap(apiClient.lastRequestBody)
+        let json = try JSONEncoder().encode(body)
+        let fields = try XCTUnwrap(JSONSerialization.jsonObject(with: json) as? [String: Any])
+        XCTAssertEqual(fields["model"] as? String, "gpt-image-2")
+        XCTAssertEqual(fields["prompt"] as? String, "A cat")
+        XCTAssertEqual(fields["n"] as? Int, 1)
+        XCTAssertNil(fields["response_format"])
+    }
+
+    func test_generateImage_gptImageAndAlias_omitUnsupportedResponseFormat() async throws {
+        for model in ["gpt-image-1.5", "custom-image-alias"] {
+            // Given
+            let apiClient = MockAPIClient()
+            apiClient.requestResult = ImageGenerationResponse(data: [
+                .init(url: nil, b64Json: Data([1, 2, 3]).base64EncodedString(), revisedPrompt: nil)
+            ])
+            let sut = ImageGenerationRepository(apiClient: apiClient)
+
+            // When
+            _ = try await sut.generateImage(prompt: "A cat", model: model, images: [])
+
+            // Then
+            let body = try XCTUnwrap(apiClient.lastRequestBody)
+            let json = try JSONEncoder().encode(body)
+            let fields = try XCTUnwrap(JSONSerialization.jsonObject(with: json) as? [String: Any])
+            XCTAssertEqual(fields["model"] as? String, model)
+            XCTAssertNil(fields["response_format"])
+        }
+    }
+
+    func test_generateImage_dallEModels_requestBase64ResponseFormat() async throws {
+        for model in ["dall-e-2", "dall-e-3"] {
+            // Given
+            let apiClient = MockAPIClient()
+            apiClient.requestResult = ImageGenerationResponse(data: [
+                .init(url: nil, b64Json: Data([1, 2, 3]).base64EncodedString(), revisedPrompt: nil)
+            ])
+            let sut = ImageGenerationRepository(apiClient: apiClient)
+
+            // When
+            _ = try await sut.generateImage(prompt: "A cat", model: model, images: [])
+
+            // Then
+            let body = try XCTUnwrap(apiClient.lastRequestBody)
+            let json = try JSONEncoder().encode(body)
+            let fields = try XCTUnwrap(JSONSerialization.jsonObject(with: json) as? [String: Any])
+            XCTAssertEqual(fields["model"] as? String, model)
+            XCTAssertEqual(fields["response_format"] as? String, "b64_json")
+        }
     }
 
     func test_generateImage_multipleImages_sendsOrderedMultipartFilesAndFields() async throws {
@@ -87,14 +136,20 @@ final class ImageGenerationRepositoryTests: XCTestCase {
             let sut = ImageGenerationRepository(apiClient: apiClient)
 
             // When
-            let result = try await sut.generateImage(prompt: "A cat", model: "gpt-image-2", images: images)
+            let result = try await sut.generateImage(prompt: "A cat", model: "custom-image-alias", images: images)
 
             // Then
             XCTAssertEqual(result.data, Data([9, 8, 7]))
             XCTAssertEqual(result.mimeType, "image/webp")
             XCTAssertEqual(result.revisedPrompt, "A blue cat")
             XCTAssertEqual(apiClient.lastRequestEndpoint, images.isEmpty ? "images/generations" : nil)
             XCTAssertEqual(apiClient.lastMultipartEndpoint, images.isEmpty ? nil : "images/edits")
+            if images.isEmpty {
+                let body = try XCTUnwrap(apiClient.lastRequestBody)
+                let json = try JSONEncoder().encode(body)
+                let fields = try XCTUnwrap(JSONSerialization.jsonObject(with: json) as? [String: Any])
+                XCTAssertNil(fields["response_format"])
+            }
         }
     }
 

openclient-llm.xcodeproj/project.pbxproj

@@ -791,8 +791,8 @@
 					"@executable_path/../Frameworks",
 					"@executable_path/../../../../Frameworks",
 				);
-				MACOSX_DEPLOYMENT_TARGET = 26.0;
-				MARKETING_VERSION = 1.7.10;
+				MACOSX_DEPLOYMENT_TARGET = 26.6;
+				MARKETING_VERSION = 1.7.15;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.artcc.openclient-llm.macos-widgets";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				REGISTER_APP_GROUPS = YES;
@@ -838,8 +838,8 @@
 					"@executable_path/../Frameworks",
 					"@executable_path/../../../../Frameworks",
 				);
-				MACOSX_DEPLOYMENT_TARGET = 26.0;
-				MARKETING_VERSION = 1.7.10;
+				MACOSX_DEPLOYMENT_TARGET = 26.6;
+				MARKETING_VERSION = 1.7.15;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.artcc.openclient-llm.macos-widgets";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				REGISTER_APP_GROUPS = YES;
@@ -1010,12 +1010,12 @@
 				INFOPLIST_KEY_UILaunchScreen_Generation = YES;
 				INFOPLIST_KEY_UISupportedInterfaceOrientations = UIInterfaceOrientationPortrait;
 				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPad = "UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight UIInterfaceOrientationPortrait UIInterfaceOrientationPortraitUpsideDown";
-				IPHONEOS_DEPLOYMENT_TARGET = 26.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 26.6;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
-				MARKETING_VERSION = 1.7.10;
+				MARKETING_VERSION = 1.7.15;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.artcc.openclient-llm";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				STRING_CATALOG_GENERATE_SYMBOLS = YES;
@@ -1059,12 +1059,12 @@
 				INFOPLIST_KEY_UILaunchScreen_Generation = YES;
 				INFOPLIST_KEY_UISupportedInterfaceOrientations = UIInterfaceOrientationPortrait;
 				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPad = "UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight UIInterfaceOrientationPortrait UIInterfaceOrientationPortraitUpsideDown";
-				IPHONEOS_DEPLOYMENT_TARGET = 26.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 26.6;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
-				MARKETING_VERSION = 1.7.10;
+				MARKETING_VERSION = 1.7.15;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.artcc.openclient-llm";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				STRING_CATALOG_GENERATE_SYMBOLS = YES;
@@ -1122,8 +1122,8 @@
 					"$(inherited)",
 					"@executable_path/../Frameworks",
 				);
-				MACOSX_DEPLOYMENT_TARGET = 26.0;
-				MARKETING_VERSION = 1.7.10;
+				MACOSX_DEPLOYMENT_TARGET = 26.6;
+				MARKETING_VERSION = 1.7.15;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.artcc.openclient-llm";
 				PRODUCT_NAME = OpenClient;
 				REGISTER_APP_GROUPS = YES;
@@ -1179,8 +1179,8 @@
 					"$(inherited)",
 					"@executable_path/../Frameworks",
 				);
-				MACOSX_DEPLOYMENT_TARGET = 26.0;
-				MARKETING_VERSION = 1.7.10;
+				MACOSX_DEPLOYMENT_TARGET = 26.6;
+				MARKETING_VERSION = 1.7.15;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.artcc.openclient-llm";
 				PRODUCT_NAME = OpenClient;
 				REGISTER_APP_GROUPS = YES;
@@ -1203,7 +1203,7 @@
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				DEVELOPMENT_TEAM = Q4X55987WE;
 				GENERATE_INFOPLIST_FILE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 26.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 26.6;
 				MARKETING_VERSION = 1.0.0;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.artcc.openclient-llm-test";
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -1226,7 +1226,7 @@
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				DEVELOPMENT_TEAM = Q4X55987WE;
 				GENERATE_INFOPLIST_FILE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 26.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 26.6;
 				MARKETING_VERSION = 1.0.0;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.artcc.openclient-llm-test";
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -1252,13 +1252,13 @@
 				INFOPLIST_FILE = ShareExtension/Resources/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = OpenClient;
 				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2026 Arturo Carretero Calvo. All rights reserved.";
-				IPHONEOS_DEPLOYMENT_TARGET = 26.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 26.6;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 					"@executable_path/../../Frameworks",
 				);
-				MARKETING_VERSION = 1.7.10;
+				MARKETING_VERSION = 1.7.15;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.artcc.openclient-llm.ShareExtension";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
@@ -1283,13 +1283,13 @@
 				INFOPLIST_FILE = ShareExtension/Resources/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = OpenClient;
 				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2026 Arturo Carretero Calvo. All rights reserved.";
-				IPHONEOS_DEPLOYMENT_TARGET = 26.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 26.6;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 					"@executable_path/../../Frameworks",
 				);
-				MARKETING_VERSION = 1.7.10;
+				MARKETING_VERSION = 1.7.15;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.artcc.openclient-llm.ShareExtension";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
@@ -1316,13 +1316,13 @@
 				INFOPLIST_FILE = "WidgetsExtension-iOS/Resources/Info.plist";
 				INFOPLIST_KEY_CFBundleDisplayName = OpenClient;
 				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2026 Arturo Carretero Calvo. All rights reserved.";
-				IPHONEOS_DEPLOYMENT_TARGET = 26.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 26.6;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 					"@executable_path/../../Frameworks",
 				);
-				MARKETING_VERSION = 1.7.10;
+				MARKETING_VERSION = 1.7.15;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.artcc.openclient-llm.widgets";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
@@ -1349,13 +1349,13 @@
 				INFOPLIST_FILE = "WidgetsExtension-iOS/Resources/Info.plist";
 				INFOPLIST_KEY_CFBundleDisplayName = OpenClient;
 				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2026 Arturo Carretero Calvo. All rights reserved.";
-				IPHONEOS_DEPLOYMENT_TARGET = 26.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 26.6;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 					"@executable_path/../../Frameworks",
 				);
-				MARKETING_VERSION = 1.7.10;
+				MARKETING_VERSION = 1.7.15;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.artcc.openclient-llm.widgets";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;

openclient-llm/Shared/Core/Networking/Models/ImageGenerationRequest.swift

@@ -12,7 +12,7 @@ nonisolated struct ImageGenerationRequest: Encodable, Sendable {
     let model: String
     let prompt: String
     let numberOfImages: Int
-    let responseFormat: String
+    let responseFormat: String?
 
     enum CodingKeys: String, CodingKey {
         case model

openclient-llm/Shared/Features/ImageGeneration/Repositories/ImageGenerationRepository.swift

@@ -71,7 +71,7 @@ struct ImageGenerationRepository: ImageGenerationRepositoryProtocol {
             model: model,
             prompt: prompt,
             numberOfImages: 1,
-            responseFormat: "b64_json"
+            responseFormat: ["dall-e-2", "dall-e-3"].contains(model) ? "b64_json" : nil
         )
         return try await apiClient.request(
             endpoint: "images/generations",

specs/litellm-api.instructions.md

@@ -51,6 +51,8 @@ description: "Use when changing OpenAI-compatible or LiteLLM networking, model d
 - Dedicated `.imageGeneration` models use `POST /images/generations`; the existing dedicated edit flow uses multipart
   `POST /images/edits`. Dedicated responses may contain bounded base64 data or an HTTP(S) URL handled by the existing image
   repository.
+- Dedicated generation requests include `response_format: "b64_json"` only for explicit `dall-e-2` and `dall-e-3` IDs;
+  omit it for GPT image models and unknown or aliased IDs, which may return base64 data or an HTTP(S) URL.
 - Chat image generation accepts text only, returns the first native image, supplies no tools, and has no fallback to a
   dedicated endpoint. Dedicated generation and editing must not be described as the same capability.
 - Generated output is capped at 25 MiB. Preserve typed image data out of model-facing tool text and persist it according to