feat: add support for OpenAI gpt-5-chat-latest model (#7058)

* feat: add support for OpenAI gpt-5-chat-latest model

- Added gpt-5-chat-latest model configuration to openAiNativeModels
- Updated OpenAiNativeHandler to recognize gpt-5-chat-latest as a Responses API model
- Added comprehensive tests for the new model
- Model is optimized for conversational AI and non-reasoning tasks

Fixes #7057

* fix: remove redundant condition and unnecessary test file

- Remove redundant gpt-5-chat-latest check in isResponsesApiModel since startsWith('gpt-5') already covers it
- Remove unnecessary dedicated test file for gpt-5-chat-latest

---------

Co-authored-by: Roo Code <[email protected]>
Co-authored-by: daniel-lxs <[email protected]>

packages/types/src/providers/openai.ts

@@ -6,6 +6,18 @@ export type OpenAiNativeModelId = keyof typeof openAiNativeModels
 export const openAiNativeDefaultModelId: OpenAiNativeModelId = "gpt-5-2025-08-07"
 
 export const openAiNativeModels = {
+	"gpt-5-chat-latest": {
+		maxTokens: 128000,
+		contextWindow: 400000,
+		supportsImages: true,
+		supportsPromptCache: true,
+		supportsReasoningEffort: false,
+		inputPrice: 1.25,
+		outputPrice: 10.0,
+		cacheReadsPrice: 0.13,
+		description: "GPT-5 Chat Latest: Optimized for conversational AI and non-reasoning tasks",
+		supportsVerbosity: true,
+	},
 	"gpt-5-2025-08-07": {
 		maxTokens: 128000,
 		contextWindow: 400000,