Add OpenAI codex provider

.changeset/eight-pots-shout.md

@@ -0,0 +1,8 @@
+---
+"kilo-code": minor
+---
+
+Add support for OpenAI Codex subscriptions (thanks Roo)
+
+- Fix: Reset invalid model selection when using OpenAI Codex provider (PR #10777 by @hannesrudolph)
+- Add OpenAI - ChatGPT Plus/Pro Provider that gives subscription-based access to Codex models without per-token costs (PR #10736 by @hannesrudolph)

cli/src/constants/providers/labels.ts

@@ -8,6 +8,7 @@ export const PROVIDER_LABELS: Record<ProviderName, string> = {
 	kilocode: "Kilo Code",
 	anthropic: "Anthropic",
 	"openai-native": "OpenAI",
+	"openai-codex": "OpenAI - ChatGPT Plus/Pro",
 	openrouter: "OpenRouter",
 	bedrock: "Amazon Bedrock",
 	gemini: "Google Gemini",

cli/src/constants/providers/models.ts

@@ -141,6 +141,7 @@ export const PROVIDER_TO_ROUTER_NAME: Record<ProviderName, RouterName | null> =
 	"vscode-lm": null,
 	gemini: null,
 	"openai-native": null,
+	"openai-codex": null,
 	mistral: null,
 	moonshot: null,
 	deepseek: null,
@@ -193,6 +194,7 @@ export const PROVIDER_MODEL_FIELD: Record<ProviderName, string | null> = {
 	"vscode-lm": "vsCodeLmModelSelector",
 	gemini: null,
 	"openai-native": null,
+	"openai-codex": null,
 	mistral: null,
 	moonshot: null,
 	deepseek: null,

cli/src/constants/providers/settings.ts

@@ -810,6 +810,9 @@ export const getProviderSettings = (provider: ProviderName, config: ProviderSett
 				createFieldConfig("openAiNativeBaseUrl", config, "Default"),
 			]
 
+		case "openai-codex":
+			return [createFieldConfig("apiModelId", config, "gpt-4o")]
+
 		case "bedrock":
 			return [
 				createFieldConfig("awsAccessKey", config),
@@ -1055,6 +1058,7 @@ export const PROVIDER_DEFAULT_MODELS: Record<ProviderName, string> = {
 	kilocode: "anthropic/claude-sonnet-4",
 	anthropic: "claude-3-5-sonnet-20241022",
 	"openai-native": "gpt-4o",
+	"openai-codex": "gpt-4o",
 	openrouter: "anthropic/claude-3-5-sonnet",
 	bedrock: "anthropic.claude-3-5-sonnet-20241022-v2:0",
 	gemini: "gemini-1.5-pro-latest",

cli/src/constants/providers/validation.ts

@@ -8,6 +8,7 @@ export const PROVIDER_REQUIRED_FIELDS: Record<ProviderName, string[]> = {
 	kilocode: ["kilocodeToken", "kilocodeModel"],
 	anthropic: ["apiKey", "apiModelId"],
 	"openai-native": ["openAiNativeApiKey", "apiModelId"],
+	"openai-codex": ["apiModelId"],
 	openrouter: ["openRouterApiKey", "openRouterModelId"],
 	ollama: ["ollamaBaseUrl", "ollamaModelId"],
 	lmstudio: ["lmStudioBaseUrl", "lmStudioModelId"],

packages/types/src/provider-settings.ts

@@ -21,6 +21,7 @@ import {
 	ioIntelligenceModels,
 	mistralModels,
 	moonshotModels,
+	openAiCodexModels,
 	openAiNativeModels,
 	qwenCodeModels,
 	sambaNovaModels,
@@ -147,6 +148,7 @@ export const providerNames = [
 	"mistral",
 	"moonshot",
 	"minimax",
+	"openai-codex",
 	"openai-native",
 	"qwen-code",
 	"roo",
@@ -341,6 +343,10 @@ const geminiCliSchema = apiModelIdProviderModelSchema.extend({
 })
 // kilocode_change end
 
+const openAiCodexSchema = apiModelIdProviderModelSchema.extend({
+	// No additional settings needed - uses OAuth authentication
+})
+
 const openAiNativeSchema = apiModelIdProviderModelSchema.extend({
 	openAiNativeApiKey: z.string().optional(),
 	openAiNativeBaseUrl: z.string().optional(),
@@ -551,6 +557,7 @@ export const providerSettingsSchemaDiscriminated = z.discriminatedUnion("apiProv
 	vsCodeLmSchema.merge(z.object({ apiProvider: z.literal("vscode-lm") })),
 	lmStudioSchema.merge(z.object({ apiProvider: z.literal("lmstudio") })),
 	geminiSchema.merge(z.object({ apiProvider: z.literal("gemini") })),
+	openAiCodexSchema.merge(z.object({ apiProvider: z.literal("openai-codex") })),
 	openAiNativeSchema.merge(z.object({ apiProvider: z.literal("openai-native") })),
 	ovhcloudSchema.merge(z.object({ apiProvider: z.literal("ovhcloud") })), // kilocode_change
 	mistralSchema.merge(z.object({ apiProvider: z.literal("mistral") })),
@@ -611,6 +618,7 @@ export const providerSettingsSchema = z.object({
 	...ovhcloudSchema.shape,
 	...inceptionSchema.shape,
 	// kilocode_change end
+	...openAiCodexSchema.shape,
 	...openAiNativeSchema.shape,
 	...mistralSchema.shape,
 	...deepSeekSchema.shape,
@@ -704,6 +712,7 @@ export const modelIdKeysByProvider: Record<TypicalProvider, ModelIdKey> = {
 	kilocode: "kilocodeModel",
 	bedrock: "apiModelId",
 	vertex: "apiModelId",
+	"openai-codex": "apiModelId",
 	"openai-native": "openAiModelId",
 	ollama: "ollamaModelId",
 	lmstudio: "lmStudioModelId",
@@ -843,6 +852,11 @@ export const MODELS_BY_PROVIDER: Record<
 		label: "MiniMax",
 		models: Object.keys(minimaxModels),
 	},
+	"openai-codex": {
+		id: "openai-codex",
+		label: "OpenAI - ChatGPT Plus/Pro",
+		models: Object.keys(openAiCodexModels),
+	},
 	"openai-native": {
 		id: "openai-native",
 		label: "OpenAI",

packages/types/src/providers/index.ts

@@ -27,6 +27,7 @@ export * from "./moonshot.js"
 export * from "./nano-gpt.js" // kilocode_change
 export * from "./ollama.js"
 export * from "./openai.js"
+export * from "./openai-codex.js"
 export * from "./openrouter.js"
 export * from "./qwen-code.js"
 export * from "./requesty.js"
@@ -58,6 +59,7 @@ import { ioIntelligenceDefaultModelId } from "./io-intelligence.js"
 import { litellmDefaultModelId } from "./lite-llm.js"
 import { mistralDefaultModelId } from "./mistral.js"
 import { moonshotDefaultModelId } from "./moonshot.js"
+import { openAiCodexDefaultModelId } from "./openai-codex.js"
 import { openRouterDefaultModelId } from "./openrouter.js"
 import { qwenCodeDefaultModelId } from "./qwen-code.js"
 import { requestyDefaultModelId } from "./requesty.js"
@@ -125,6 +127,8 @@ export function getProviderDefaultModelId(
 			return options?.isChina ? mainlandZAiDefaultModelId : internationalZAiDefaultModelId
 		case "openai-native":
 			return "gpt-4o" // Based on openai-native patterns
+		case "openai-codex":
+			return openAiCodexDefaultModelId
 		case "mistral":
 			return mistralDefaultModelId
 		case "openai":

packages/types/src/providers/openai-codex.ts

@@ -0,0 +1,179 @@
+import type { ModelInfo } from "../model.js"
+
+/**
+ * OpenAI Codex Provider
+ *
+ * This provider uses OAuth authentication via ChatGPT Plus/Pro subscription
+ * instead of direct API keys. Requests are routed to the Codex backend at
+ * https://chatgpt.com/backend-api/codex/responses
+ *
+ * Key differences from openai-native:
+ * - Uses OAuth Bearer tokens instead of API keys
+ * - Subscription-based pricing (no per-token costs)
+ * - Limited model subset available
+ * - Custom routing to Codex backend
+ */
+
+export type OpenAiCodexModelId = keyof typeof openAiCodexModels
+
+export const openAiCodexDefaultModelId: OpenAiCodexModelId = "gpt-5.2-codex"
+
+/**
+ * Models available through the Codex OAuth flow.
+ * These models are accessible to ChatGPT Plus/Pro subscribers.
+ * Costs are 0 as they are covered by the subscription.
+ */
+export const openAiCodexModels = {
+	"gpt-5.1-codex-max": {
+		maxTokens: 128000,
+		contextWindow: 400000,
+		supportsNativeTools: true,
+		defaultToolProtocol: "native",
+		includedTools: ["apply_patch"],
+		excludedTools: ["apply_diff", "write_to_file"],
+		supportsImages: true,
+		supportsPromptCache: true,
+		supportsReasoningEffort: ["low", "medium", "high", "xhigh"],
+		reasoningEffort: "xhigh",
+		// Subscription-based: no per-token costs
+		inputPrice: 0,
+		outputPrice: 0,
+		supportsTemperature: false,
+		description: "GPT-5.1 Codex Max: Maximum capability coding model via ChatGPT subscription",
+	},
+	"gpt-5.1-codex": {
+		maxTokens: 128000,
+		contextWindow: 400000,
+		supportsNativeTools: true,
+		defaultToolProtocol: "native",
+		includedTools: ["apply_patch"],
+		excludedTools: ["apply_diff", "write_to_file"],
+		supportsImages: true,
+		supportsPromptCache: true,
+		supportsReasoningEffort: ["low", "medium", "high"],
+		reasoningEffort: "medium",
+		// Subscription-based: no per-token costs
+		inputPrice: 0,
+		outputPrice: 0,
+		supportsTemperature: false,
+		description: "GPT-5.1 Codex: GPT-5.1 optimized for agentic coding via ChatGPT subscription",
+	},
+	"gpt-5.2-codex": {
+		maxTokens: 128000,
+		contextWindow: 400000,
+		supportsNativeTools: true,
+		defaultToolProtocol: "native",
+		includedTools: ["apply_patch"],
+		excludedTools: ["apply_diff", "write_to_file"],
+		supportsImages: true,
+		supportsPromptCache: true,
+		supportsReasoningEffort: ["low", "medium", "high", "xhigh"],
+		reasoningEffort: "medium",
+		inputPrice: 0,
+		outputPrice: 0,
+		supportsTemperature: false,
+		description: "GPT-5.2 Codex: OpenAI's flagship coding model via ChatGPT subscription",
+	},
+	"gpt-5.1": {
+		maxTokens: 128000,
+		contextWindow: 400000,
+		supportsNativeTools: true,
+		defaultToolProtocol: "native",
+		includedTools: ["apply_patch"],
+		excludedTools: ["apply_diff", "write_to_file"],
+		supportsImages: true,
+		supportsPromptCache: true,
+		supportsReasoningEffort: ["none", "low", "medium", "high"],
+		reasoningEffort: "medium",
+		// Subscription-based: no per-token costs
+		inputPrice: 0,
+		outputPrice: 0,
+		supportsVerbosity: true,
+		supportsTemperature: false,
+		description: "GPT-5.1: General GPT-5.1 model via ChatGPT subscription",
+	},
+	"gpt-5": {
+		maxTokens: 128000,
+		contextWindow: 400000,
+		supportsNativeTools: true,
+		defaultToolProtocol: "native",
+		includedTools: ["apply_patch"],
+		excludedTools: ["apply_diff", "write_to_file"],
+		supportsImages: true,
+		supportsPromptCache: true,
+		supportsReasoningEffort: ["minimal", "low", "medium", "high"],
+		reasoningEffort: "medium",
+		// Subscription-based: no per-token costs
+		inputPrice: 0,
+		outputPrice: 0,
+		supportsVerbosity: true,
+		supportsTemperature: false,
+		description: "GPT-5: General GPT-5 model via ChatGPT subscription",
+	},
+	"gpt-5-codex": {
+		maxTokens: 128000,
+		contextWindow: 400000,
+		supportsNativeTools: true,
+		defaultToolProtocol: "native",
+		includedTools: ["apply_patch"],
+		excludedTools: ["apply_diff", "write_to_file"],
+		supportsImages: true,
+		supportsPromptCache: true,
+		supportsReasoningEffort: ["low", "medium", "high"],
+		reasoningEffort: "medium",
+		// Subscription-based: no per-token costs
+		inputPrice: 0,
+		outputPrice: 0,
+		supportsTemperature: false,
+		description: "GPT-5 Codex: GPT-5 optimized for agentic coding via ChatGPT subscription",
+	},
+	"gpt-5-codex-mini": {
+		maxTokens: 128000,
+		contextWindow: 400000,
+		supportsNativeTools: true,
+		defaultToolProtocol: "native",
+		includedTools: ["apply_patch"],
+		excludedTools: ["apply_diff", "write_to_file"],
+		supportsImages: true,
+		supportsPromptCache: true,
+		supportsReasoningEffort: ["low", "medium", "high"],
+		reasoningEffort: "medium",
+		// Subscription-based: no per-token costs
+		inputPrice: 0,
+		outputPrice: 0,
+		supportsTemperature: false,
+		description: "GPT-5 Codex Mini: Faster coding model via ChatGPT subscription",
+	},
+	"gpt-5.1-codex-mini": {
+		maxTokens: 128000,
+		contextWindow: 400000,
+		supportsNativeTools: true,
+		defaultToolProtocol: "native",
+		includedTools: ["apply_patch"],
+		excludedTools: ["apply_diff", "write_to_file"],
+		supportsImages: true,
+		supportsPromptCache: true,
+		supportsReasoningEffort: ["low", "medium", "high"],
+		reasoningEffort: "medium",
+		inputPrice: 0,
+		outputPrice: 0,
+		supportsTemperature: false,
+		description: "GPT-5.1 Codex Mini: Faster version for coding tasks via ChatGPT subscription",
+	},
+	"gpt-5.2": {
+		maxTokens: 128000,
+		contextWindow: 400000,
+		supportsNativeTools: true,
+		defaultToolProtocol: "native",
+		includedTools: ["apply_patch"],
+		excludedTools: ["apply_diff", "write_to_file"],
+		supportsImages: true,
+		supportsPromptCache: true,
+		supportsReasoningEffort: ["none", "low", "medium", "high", "xhigh"],
+		reasoningEffort: "medium",
+		inputPrice: 0,
+		outputPrice: 0,
+		supportsTemperature: false,
+		description: "GPT-5.2: Latest GPT model via ChatGPT subscription",
+	},
+} as const satisfies Record<string, ModelInfo>

src/api/index.ts

@@ -14,6 +14,7 @@ import {
 	VertexHandler,
 	AnthropicVertexHandler,
 	OpenAiHandler,
+	OpenAiCodexHandler,
 	LmStudioHandler,
 	GeminiHandler,
 	OpenAiNativeHandler,
@@ -186,6 +187,8 @@ export function buildApiHandler(configuration: ProviderSettings): ApiHandler {
 			return new LmStudioHandler(options)
 		case "gemini":
 			return new GeminiHandler(options)
+		case "openai-codex":
+			return new OpenAiCodexHandler(options)
 		case "openai-native":
 			return new OpenAiNativeHandler(options)
 		case "deepseek":